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Middle Power Class-D S peaker Amplifiers
Class-D Speaker Amplifier
for Digital Input
BD5446EFV
●Description
BD5446EFV is a Class D Speaker Amplifier designed for Flat-panel TVs in particular for space-saving and low-power
consumption, delivers an output power of 20W+20W. This IC employs state-of-the-art Bipolar, CMOS, and DMOS (BCD)
process technology that eliminates turn-on resistance in the output power stage and internal loss due to line resistances up
to an ultimate level. With this technology, the IC can achieve high efficiency of 87% (10W+10W output with 8Ω load). In
addition, the IC is packaged in a compact reverse heat radiation type power package to achieve low power consumption
and low heat generation and eliminates necessity of external heat-sink up to a total output power of 40W. This product
satisfies both needs for drastic downsizing, low-profile structures and many function, high quality playback of sound s ystem.
●Features
1) BD5446EFV has two system of digital audio interface.
(I2S/LJ format, SDATA: 16 / 20 / 24bit, LRCLK: 32kHz / 44.1kHz / 48kHz, BCLK: 64fs (fixed), SYS_CLK: 256fs (fixed))
2) Within the wide range of the power supply voltage, it is possible to operate in a single power supply. (10~26V)
3) It contributes to miniaturizing, making to the thin ty pe, and the p ower saving o f the sy stem by high ef fi ciency and low hea t.
4) S/N of the system can be optimized by adjusting the gain setting amon g 8 steps. (20~34dB / 2dB step)
5) It has the output power limitation function that can be adjusted to an arbitrary output power.
6) The decrease in sound qu ality because of the change of the power supply voltage is prevented with the feedback
circuitry of the output. In addition, a low noise and lo w distortion are ac hieved.
7) It provides with the best stereo DAC output for the headphone usage. As a result, the output of the selection of the
digital input in two systems is possible.
8) Eliminates pop noise generated when the power supply goes on/off, or when the power supply is suddenly shut off.
High quality muting performance is realize d by using the soft-muting technology.
9) BD5446EFV is a highl y reliable design to which it has various protection fu nctions.
(High temperature protection, Under voltage protection, Output short protection, Output DC voltage protec tion and
Clock stop protection)
●Applications
Flat Panel TVs (LCD, Plasma), Home Audio, Desktop PC, Amusement equ ipments, Electronic Music equ ipments, etc.,
No.11075ECT14
Technical Note
2/31
BD5446EFV
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© 2011 ROHM Co., Ltd. All rights reserved.
●Absolute maximum ratings (Ta=25℃)
Parameter Symbol Ratings Unit Conditions
Supply voltage VCC 30 V Pin 25, 28, 29, 53, 54 *1 *2
Power dissipation Pd 2.0 W *3
4.5 W *4
6.2 W *5
Input voltage VIN -0.3 ~ 4.5 V Pin 7 ~ 18, 21 *1
Open-drain terminal voltage VERR -0.3 ~ 30 V Pin24 *1
Operating temperature range Topr -25 ~ +85 ℃
Storage temperature range Tstg -55 ~ +150 ℃
Maximum junction temperature Tjmax +150 ℃
*1 The voltage that can be applied reference to GND (Pin 6, 36, 37, 45, 46).
*2 Do not, however exceed Pd and Tjmax=150℃.
*3 70mm×70mm×1.6mm, FR4, 1-layer glass epoxy board (Copper on bottom layer 0%)
Derating in done at 16mW/℃ for operating above Ta＝25℃.
*4 70mm×70mm×1.6mm, FR4, 2-layer glass epoxy board (Copper on bottom layer 100%)
Derating in done at 36mW/℃ for operating above Ta＝25℃. There are thermal via on the board.
*5 70mm×70mm×1.6mm, FR4, 4-layer glass epoxy board (Copper on bottom layer 100%)
Derating in done at 49.6mW/℃ for operating above Ta＝25℃. There are thermal via on the board.
●Operating conditions (Ta=25℃)
Parameter Symbol Ratings Unit Conditions
Supply voltage VCC 10 ~ 26 V Pin 25, 28, 29, 53, 54 *1 *2
Minimum load impedance
(Speaker Output) RL_SP 5.4 Ω *6
Minimum load impedance
(DAC Output) RL_DA 20 kΩ Pin 22, 23
*6 Do not, however exceed Pd.
* No radiation-proof design.
Technical Note
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BD5446EFV
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●Electrical cha r acteristics
(Unless otherwise specified Ta= 25℃,Vcc=13V,f=1kHz,RL_SP=8Ω,RL_DA=20kΩ,RESETX=3.3V,MUTEX=3.3V,PDX=3.3V,
Gain=20dB,fs=48kHz)
Item Symbol
Limits Unit Conditions
Min Typ Max
Total circuit
Circuit current ICC1 - 45 90 mA
Pin 25, 28, 29, 53, 54
No load
Circuit current
(Power down mode) ICC2 - 1.5 3 mA
Pin 25, 28, 29, 53, 54,No load
RESETX=0V,MUTEX=0V,PDX=0V
Open-drain terminal
Low level voltage VERR - - 0.8 V Pin 24,IO=0.5mA
Regulator output voltage 1 VREG_G 5.0 5.5 6.0 V Pin 1, 27
Regulator output voltage 2 VREG_3 3.0 3.3 3.6 V Pin 5
High level input voltage VIH 2.5 - 3.3 V Pin 7 ~ 18, 21
Low level input voltage VIL 0 - 0.8 V Pin 7 ~ 18, 21
Input current
(Input pull-down terminal) IIH 33 66 132 µA Pin 7 ~ 18, 21,VIN = 3.3V
Speaker Output
Maximum momentary
output power 1 PO1 - 10 - W
THD+n=10%
GAIN=26dB *7
Maximum momentary
output power 2 PO2 - 20 - W
VCC=18V, THD+n=10%
GAIN =26dB *7
Total harmonic distortion THDSP - 0.07 - % PO=1W, BW=20~20kHz *7
Crosstalk CTSP 65 80 - dB PO=1W, BW=IHF-A *7
Output noise voltage
(Sampling mode) VNO_SP - 140 280 µVrms -∞dBFS, BW=IHF-A *7
Residual noise voltage
(Mute mode) VNOR_SP - 5 10 µVrms MUTEX=0V,-∞dBFS, BW=IHF-A *7
PWM sampling frequency
fPWM1 - 512 - KHz fs=32kHz *7
fPWM2 - 705.6 - KHz fs=44.1kHz *7
fPWM3 - 768 - KHz fs=48kHz *7
DAC Output
Maximum output voltage VOMAX 0.85 1.0 - Vrms 0dBFS,THD+n=1%
Channel Balance CB -1 0 1 dB 0dBFS
Total harmonic distortion THDDA - 0.05 0.5 % -20dBFS,BW=20~20kHz
Crosstalk CTDA 65 80 - dB 0dBFS,BW=IHF-A
Output noise voltage VNO_DA - 10 20 µVrms -∞dBFS, BW =IHF -A
Residual noise voltage VNOR_DA - 3 10 µVrms MUTEX=0V,PDX=0V,
-∞dBFS, BW=IHF-A
*7 These items show the typical performance of device and depend on board layout, parts, and power supply.
The standard value is in mounting device and parts on surface of ROHM’s board directly.
Technical Note
4/31
BD5446EFV
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© 2011 ROHM Co., Ltd. All rights reserved.
●Electrical c ha racteristic curves(VCC=13V,Ta=25℃,RL_SP=8Ω,RL_DA=20kΩ,Gain=20dB,fin=1kHz,fs=48kHz)
Measured by ROHM designed 4 la yer board.
0
10
20
30
40
50
60
70
80
90
100
8 10 1214 161820 222426 28
VCC(V)
ICC(mA)
0
1
2
3
0 5 10 15 20 25 30 35 40
TOTAL OUTPUT P O WE R(W )
ICC(A)
0
4
8
12
16
20
24
28
32
36
40
44
8 10 121416 18202224 2628
VCC(V)
O UT PUT P OWE R(W/c h)
Fig.1 Fig.2 Fig.3
Fig.4 Fig.5 Fig.6
Fig.7 Fig.8 Fig.9
Fig.10 Fig.11 Fig.12
Current consumption
- Power su
pp
l
y
volta
g
e Output power
- Power supply voltage Current consumption
- Out
p
ut
p
owe
r
Efficiency - Output power Voltage gain - Frequency FFT of Output noise voltage
THD+N - Output power THD+N - Frequency Crosstalk - Output power
Crosstalk –Frequency Wave form when
Releasing Soft-mute Wave form when
Activating Soft-mute
Sampling
Mute
10
12
14
16
18
20
22
24
26
28
30
10 100 1k 10k 100k
FREQUENCY(Hz)
VOLTAGE GAIN(dB)
Po=1W
L=22µH
C=0.47µF
C
g
=0.068
µ
F
-140
-120
-100
-80
-60
-40
-20
0
10 100 1k 10k 100k
FREQUENCY(Hz)
NOISE FFT(dBV)
Without signal
BW=20～20KHz
0.01
0.1
1
10
100
10 100 1k 10k 100k
FREQUENCY(Hz)
THD+N(%)
Po=1W
BW=20～20KHz
-100
-90
-80
-70
-60
-50
-40
-30
-20
-10
0
0.001 0.01 0.1 1 10
O UTPUT PO WER(W)
CROSSTALK(dB)
BW=20～20KHz
-100
-90
-80
-70
-60
-50
-40
-30
-20
-10
0
10 100 1k 10k 100k
FREQUENCY(Hz)
CROSSTALK(dB)
Po=1W
BW=20～20KHz
fin=300Hz
P
o
=
3
.
3
W
5V/div
2V/div
S
p
eaker out
p
u
t
10ms/div
MUTEX
S
p
eaker out
p
u
t
MUTEX
10ms/div
fin=300Hz
P
o
=
3
.
3
W
2V/div
5V/div
0.01
0.1
1
10
100
0.001 0.01 0.1 1 10 100
O UT PUT P OWE R(W)
THD+N(%)
BW=20～20KHz
100Hz
1KHz
6KHz
THD=10%
THD=1%
VCC=13V
VCC=18V
0
10
20
30
40
50
60
70
80
90
100
024681012
OUTPUT POWER(W/ch)
EFFICIENCY(%)
Technical Note
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BD5446EFV
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© 2011 ROHM Co., Ltd. All rights reserved.
●Electrical c ha racteristic curves(VCC=18V,Ta=25℃,RL_SP=8Ω,RL_DA=20kΩ,Gain=20dB,fin=1kHz,fs=48kHz)
Measured by ROHM designed 4layer board.
Fig.13 Fig.14 Fig.15
Fig.16 Fig.17 Fig.18
Fig.19
Efficiency – Output power Voltage gain - Frequency FFT of output noise voltage
THD+N - Output power THD+N - Frequency Crosstalk - Output power
Crosstalk - Frequency
20
22
24
26
28
30
32
34
36
38
40
10 100 1k 10k 100k
FREQUENCY(Hz)
VOLTAGE GAIN(dB)
Po=1W
L=22µH
C=0.47µF
Cg=0.068µF
-140
-120
-100
-80
-60
-40
-20
0
10 100 1k 10k 100k
FREQUENCY(Hz)
NOISE FFT(dBV)
Without signal
BW=20～20KHz
0.01
0.1
1
10
100
10 100 1k 10k 100k
FREQUENCY(Hz)
THD+N(%)
Po=1W
BW=20～20KHz
-100
-90
-80
-70
-60
-50
-40
-30
-20
-10
0
0.001 0.01 0.1 1 10 100
O UTPUT PO WER(W)
CROSSTALK(dB)
BW=20～20KHz
-100
-90
-80
-70
-60
-50
-40
-30
-20
-10
0
10 100 1k 10k 100k
FREQUENCY(Hz)
CROSSTALK(dB)
Po=1W
BW=20～20KHz
0.01
0.1
1
10
100
0.001 0.01 0.1 1 10 100
O UT PUT P OWE R(W)
THD+N(%)
BW=20～20KHz
6KHz
100Hz
1KHz
0
10
20
30
40
50
60
70
80
90
100
0 5 10 15 20
OUTPUT POWER(W/ ch)
EFFICIENCY(%)
Technical Note
6/31
BD5446EFV
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© 2011 ROHM Co., Ltd. All rights reserved.
●Pin conf iguration and Block diagram
40
39
38
37
36
35
34
33
32
31
30
29
48
47
46
45
44
43
42
41
28
3
4
5
6
7
8
9
14
15
16
17
18
19
20
21
10
11
12
13
22
23
24
51
50
49
54
53
52
27
26
25
I2S/LJ
Interface
Gain
Selector
PWM
Modulator
×8 Over
Sampling
Digital
Filter
Control
Interface
TEST
DAC
Selector
High Temperature Protection
Under Voltage Protection
Clock Stop Protection
Output Short Protection
Output DC Voltage Protection
1
2
VCCA
NC
REG_G2
FILA
Power
Limiter
GNDA
DAC
REG_3
REG_G1
Driver
1P
Driver
1N GNDP1
REG_G1
REG_G1
VCCP1
NC
NC
NC
Driver
2P
Driver
2N
GNDP2
REG_G2
REG_G2
VCCP2
NC
NC
NC
NC
I2S/LJ
Selector
FILP
Technical Note
7/31
BD5446EFV
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© 2011 ROHM Co., Ltd. All rights reserved.
●Pin function explanation (Provided pin voltages are typ. Values)
No. Pin name Pin voltage Pin explanation Internal equivalence circuit
1
27 REG_G1
REG_G2 5.5V
Internal power supply pin for ch1 Gate driver
Internal power supply pin for ch2 Gate driver
Please connect the capacitor.
2 FILP 1.75V~2.55V
Bias pin for PWM signal
Please connect the capacitor.
3 PLMT 0V Power limiter setting terminal
4
FILA 2.5V
Bias pin for Analog signal
Please connect the capacitor.
5 REG3 3.3V
Internal power supply pin for Digital circuit
Please connect the capacitor.
6 GNDA 0V GND pin for Analog sign al －
25
2
6
400K
25
3
6
27
4
6
50K
50K
25
5
6
500K
1
27
550K
53,54
28,29
45,46
36,37
Technical Note
8/31
BD5446EFV
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© 2011 ROHM Co., Ltd. All rights reserved.
No. Pin name Pin voltage Pin explanation Internal equival ence circuit
7
8
9
10
11
SYS_CLK
BCLK
LRCLK
SDATA1
SDATA2
0V Digital audio signal input pin
12 RESETX
0V
Reset pin for Digital circuit
H: Reset OFF
L: Reset ON
13 MUTEX Speaker output mute control pin
H: Mute OFF
L: Mute ON
14 PDX
Power down control pin
H: Power down OFF
L: Power down ON
15 IIS_LJ 0V
Digital audio signal data format setting terminal
H: Left Justified format
L: I2S format
16
17
18
GAIN1
GAIN2
GAIN3 0V Gain setting terminal
Gain=20dB~34dB, 2dB step
19
20 TEST1
TEST2 0V Test pin
Please connect to GND.
21 SEL_DAC 0V
DAC output selection terminal
H: SDATA2 is output from the DAC
L: SDATA1 is output from the DAC
5
7,8,9
10,11
6
50K
5
12,13,14
6
50K
5
6
15
50K
5
16,17,18
6
50K
5
19,20
6
50K
5
6
21
50K
Technical Note
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BD5446EFV
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No. Pin name Pin voltage Pin e xplan ation Internal equivalence circuit
22
23 OUT_DAC2
OUT_DAC1 2.5V
ch2 DAC output pin
ch1 DAC output pin
Please connect it with the latter part circuit
through the capacitor.
24 ERROR 3.3V
Error flag pin
Please connect pull-up resisto r .
H: While Normal
L: While Error
25 VCCA VCC
Power supply pin for Analog signa l －
26,30
34,35
41,47
48,52
N.C. － Non connection pin －
500
25
24
6
25
6
22,23
50K
Technical Note
10/31
BD5446EFV
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© 2011 ROHM Co., Ltd. All rights reserved.
No. Pin name Pin voltage Pin explanation Internal equivalence circuit
28,29 VCCP2 Vcc Power supply pin for ch2 PWM signal
31,32 OUT2P Vcc~0V
Output pin of ch2 positive PWM
Please connect to Output LPF.
33 BSP2P
－ Boot-strap pin of ch2 positive
Please connect the capacitor.
36,37 GNDP2 0V GND pin for ch2 PWM signal
38,39 OUT2N Vcc~0V
Output pin of ch2 negative PWM
Please connect to Output LPF.
40 BSP2N － Boot-strap pin of ch2 negative
Please connect the capacitor.
42 BSP1N － Boot-strap pin of ch1 negative
Please connect the capacitor.
43,44 OUT1N Vcc~0V
Output pin of ch1 negative PWM
Please connect to Output LPF.
45,46 GNDP1 0V GND pin for ch1 PWM signal
49 BSP1P － Boot-strap pin of ch1 positive
Please connect the capacitor.
50,51 OUT1P Vcc~0V
Output pin of ch1 positive PWM
Please connect to Output LPF.
53,54 VCCP1 － Power supply pin for ch1 PWM signal
28,29
33
40
31,32
38,39
36,37
53,54
42
49
43,44
50,51
45,46
Technical Note
11/31
BD5446EFV
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© 2011 ROHM Co., Ltd. All rights reserved.
●GAIN1 pin, GAIN2 pin, GAIN3 pin function
GAIN3
(18pin) GAIN2
(17pin) GAIN1
(16pin) Speaker output gain
L L L 20dB
L L H 22dB
L H L 24dB
L H H 26dB
H L L 28dB
H L H 30dB
H H L 32dB
H H H 34dB
●SEL_DAC pin function
SEL_DAC
(21pin) OUT_DAC1 (23pin) OUT_DAC2 (24pin)
L The Lch signal of SDATA1 is output The Rch signal of SDATA1 is output
H T he Lch signal of SDATA2 is output The Rch signal of SDATA2 is output
●RESETX pin function
RESETX
(10pin) State of Digital block
L Reset ON
H Reset OFF
●RESETX pin
RESETX
(12pin) State of Digital block
L Reset ON
H Reset OFF
●PDX pin,MUTEX pin function
PDX
(12pin) MUTEX
(11pin) Power Down DAC output
(24,25pin) PWM output
(33,34,38,39,43,44,48pin)
L L or H ON HiZ_Low HiZ_Low
H L OFF Normal operation
H H Normal operation
●IIS_LJ pin function
IIS_LJ
(15pin) Digital data format
L I2S
H Left Justified
Technical Note
12/31
BD5446EFV
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© 2011 ROHM Co., Ltd. All rights reserved.
●Input digital audi o si gnal sampling frequency (fs) explanatio n
PWM sampling frequency, Soft-start, Soft-mute time, and the detection time of the DC voltage protection in the speaker
depends on sampling frequen cy (fs) of the digital audio input.
Sampling frequency of the
digital audio input
(fs)
PWM sampling frequency
(fpwm) Soft-start / Soft-mute time DC voltage prot ection in
the speaker detection time
32kHz 512kHz 64msec. 64msec.
44.1kHz 705.6kHz 46msec. 46msec.
48kHz 768kHz 43msec. 43msec.
●For voltage gain (Gain s ettin g)
BD5446EFV prescribe voltage gain at speak er output (BTL output) under the defin ition 0dBV (1Vrms) as full scale input of
the digital audio input signal. For example, d igital audio input signal = Full scale input, Gain setting = 20dB, Load resistance
RL_SP = 8Ω will give speaker output (BTL output) amplitude as Vo=10Vrms. (Output power Po = Vo2/RL_SP = 12.5W )
●Speaker output and DAC output
Digital audio input signal SDATA1 will be output to the speaker. (SDATA2 will not be output to the speaker. DAC output can
be selected either from digital audio input sig nal SDATA1 or SDATA2.)
●Format of digital audio input
・SYS_CLK: It is System Clock input signal.
It will input LRCLK, BCLK, SDATA1 (SDATA2) that synchronizes with this clock that are 256 tim es of sampling frequenc y
(256fs).
・LRCLK: It is L/R clock input signal.
It corresponds to 32kHz/44.1kHz/48kHz with those clock (fs) that are same to the sampling frequency (fs) .
The data of a left channel and a right channel for one sample is input to this sectio n.
・BCLK: It is Bit Clock input signal.
It is used for the latch of data in every one bit by sampling frequency’s 64 times sampling frequ ency (64fs).
・SDATA1 & SDATA2: It is Data input signal.
It is amplitude data. The data length is differe nt according to the resolution of the input digital audio data.
It corresponds to 16/ 20/ 24 bit.
Technical Note
13/31
BD5446EFV
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© 2011 ROHM Co., Ltd. All rights reserved.
LRCLK
(SDATA2)
BCLK
SDATA1
Lch Rch
32 clocks 32 clocks
Fig.20 I2S Data Format 64fs, 24 bit Data
MSB 22 21 20 19 18 17 16 15 14 MSB 22 21 20 19 18 17 16 15 1413 12 11 10 9 813 12 11 10 9 87 676
3
54 1
2LSB 3
54 12 LSB
MSB 18 17 9 8 7 6 5 MSB 18 1716 15 14 13 12 11 10 4321
LSB 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 LSB
LRCLK
(SDATA2)
BCLK
SDATA1
Lch Rch
Fig.21 I2S Data Format 64fs, 20 bit Data
MSB MSB
LRCLK
(SDATA2)
BCLK
SDATA1
Lch Rch
9876514 13 12 11 10 4321
LSB 9876514 13 12 11 10 4321
LSB
Fig.22 I2S Data Format 64fs, 16 bit Data
1/64fs
LRCLK
(SDATA2)
BCLK
SDATA1
Lch1/64fs Rch
32 clocks 32 clocks
Fig.23 Left-Justified Data Format 64fs, 24 bit Data
MSB 22 21 20 19 18 17 16 15 14 MSB 22 21 20 19 18 17 16 15 1413 12 11 10 9 813 12 11 10 9 87 676
3
54 1
2LSB 354 12LSB
MSB 18 17 9 8 7 6 5 MSB 18 1716 15 14 13 12 11 10 4321
LSB 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 LSB
LRCLK
(SDATA2)
BCLK
SDATA1
Lch Rch
Fig.24 Left-Justified Data Format 64fs, 20 bit Data
MSB MSB
LRCLK
(SDATA2)
BCLK
SDATA1
Lch Rch
9876514 13 12 11 10 4321
LSB 9876514 13 12 11 10 4321
LSB
Fig.25 Left-Justified Data Format 64fs, 16 bit Data
●I2S data format
The Low section of LRCLK becomes Lch, the High section o f LRCLK becomes Rch.
After changing LRCLK, second bit becomes MSB.
●Left-justified format
The High section of LRCLK becomes Lch, the Low section of LRCLK becomes Rch.
After changing LRCLK, first bit becomes MSB.
Technical Note
14/31
BD5446EFV
www.rohm.com 2011.06 - Rev.C
© 2011 ROHM Co., Ltd. All rights reserved.
●Audio Interface format and timing
Recommended timing and operating conditions (MCLK, BCLK, LRCLK, SDATA)
※1 This regulation is to keep rising edge of LRCK and rising edge of BCLK from overlapping.
※2 This regulation is to keep rising edge of SYS_CLK and rising edge of BCLK from overlapping.
Parameter Symbol
Limit Unit
Min. Max.
1 SYS_CLK frequency fSYS_CLK 8.192 12.288 MHz
2 LRCLK frequency fLRCLK 32 48 kHz
3 BCLK frequency fBCLK 2.048 3.072 MHz
4 Setup time, LRCLK※1 tSU;LR 20 － ns
5 Hold time, LRCLK※1 tHD;LR 20 － ns
6 Setup time, SDATA tSU;SD 20 － ns
7 Hold time, SDATA tHD;SD 20 － ns
8 Setup time, BCLK※2 tSU;BC 2.5 － ns
9 Hold time, BCLK※2 tHD;BC 3.5 － ns
SYS_CLK
1/ｆ
LRCLK
1/fLRCLK
BCLK
1/fBCLK
LRCLK
BCLK
SDATA
tHD;LR tSU;LR
tHD;SD
/SYS_CLK
;
tSU ;SD
;
SYS_CLK
BCLK
tHD;BC
;tSU ;BC
;
Fig-27 Audio Interface timing (1)
Fig-26 Clock timing
Fig-28 Audio Interface timing (2)
Technical Note
15/31
BD5446EFV
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© 2011 ROHM Co., Ltd. All rights reserved.
●Power supply start-u p se quence
VCCP1 (53, 54pin)
VCCP2 (28, 29pin)
VCCA (25pin)
REG_G1 (1pin)
REG_3 (5pin)
PDX (14pin)
BCLK (8pin)
LRCLK (9pin)
Speaker output
SDATA1 (10pin)
SDATA2 (11pin)
REG_G2 (27pin)
①Power up VCCA, VCCP1, VCCP2 simultaneously.
REG_G1, REG_G2
REG_3
③Degital audio data communication.
④Set PDX to High.
⑤Set MUTEX to High.
OUT_DAC2 (22pin)
OUT_DAC1 (23pin)
t
t
t
t
t
t
t
MUTEX (13pin)
RESETX (12pin)
②Set RESETX to High after power up.
t
SYS_CLK (7pin)
Soft-start
43msec(fs=48kHz)
Technical Note
16/31
BD5446EFV
www.rohm.com 2011.06 - Rev.C
© 2011 ROHM Co., Ltd. All rights reserved.
●Power supply shut-down sequence
VCCP1 (53, 54pin)
VCCP2 (28, 29pin)
VCCA (25pin)
REG_G1 (1pin)
REG_3 (5pin)
RESETX (12pin)
MUTEX (13pin)
PDX (14pin)
BCLK (8pin)
LRCLK (9pin)
SDATA1 (10pin)
SDATA2 (11pin)
REG_G2 (27pin)
REG_G1, REG_G2
REG_3
①Set MUTEX to Low.
②Set PDX to Low.
③Stop digital audio date signal.
④Set RESETX to Low
⑤Power down VCCA, VCCP1, VCCP2, simultaneously.
OUT_DAC2 (22pin)
OUT_DAC1 (23pin)
t
t
t
t
t
t
t
t
SYS_CLK (7pin)
Soft-mute
43msec(fs=48kHz)
Technical Note
17/31
BD5446EFV
www.rohm.com 2011.06 - Rev.C
© 2011 ROHM Co., Ltd. All rights reserved.
●About the protecti on function
Protection function Detecting & Releasing condition DAC
Output PWM
Output ERROR
Output
Output short
protection Detecting
condition Detecting current = 10A (TYP.) Normal
operation
HiZ_Low
(Latch) L
(Latch)
DC voltage protection
in the speaker Detecting
condition PWM output Duty=0% or 100%
43msec(fs=48kHz) above fixed HiZ_Low
(Latch) L
(Latch)
High temperature
protection
Detecting
condition Chip temperature to be above 150℃ (TYP.) Normal
operation
HiZ_Low H
Releasing
condition Chip temperature to be below 120℃ (TYP.) Normal
operation
Under voltage
protection
Detecting
condition Power supply voltage to be below 8V (TYP.) Normal
operation
HiZ_Low H
Releasing
condition Power supply voltage to be above 9V (TYP.) Normal
operation
Clock stop protection
Detecting
condition No change to SYS_CLK more than 1usec (TYP.) Irregular
output HiZ_Low H
Releasing
condition Normal input to SYS_CLK Normal
operation Normal
operation
* The ERROR pin is Nch open-drain output.
* Once an IC is latched, the circuit is not released automatically even after an abnormal status is removed.
The following procedures ① or ② is available for recovery.
①After the MUTEX pin is made Low once, the MUTEX pin is returned to High again.
②Turning on the power supply again.
Technical Note
18/31
BD5446EFV
www.rohm.com 2011.06 - Rev.C
© 2011 ROHM Co., Ltd. All rights reserved.
1) High temperature protection
This IC has the high temperat ure protection circuit that prevents thermal r eckless driving under an a bnormal state for the
temperature of the chip to exceed Tjmax=150℃.
Detecting condition - It will detect when MUTE pin is set High and the temperature of the chip bec omes 150℃(T YP.) or
more. The speaker output is muted through a soft-mute when detected.
Releasing condition - It will release when MUTE pin is set High and the temperature of the chip bec omes 120℃(TYP.)
or less. The speaker output is outputted through a soft-start when released.
OUT1P (50, 51pin)
Temperature of
IC chip junction(℃)
Speaker output
OUT_DAC2 (22pin)
OUT_DAC1 (23pin)
150℃
120℃
HiZ-Low
Soft-mute
43msec(fs=48KHz)
3.3V
ERROR (24pin)
OUT1N (43, 44pin)
OUT2N (38, 39pin)
OUT2P (31, 32pin)
t
t
t
t
t
Soft-start
43msec(fs=48KHz)
Technical Note
19/31
BD5446EFV
www.rohm.com 2011.06 - Rev.C
© 2011 ROHM Co., Ltd. All rights reserved.
2) Under voltage protection
This IC has the under voltage protection circuit that make speaker output m ute once detecting e xtreme drop of the p ower
supply voltage.
Detecting condition – It will detect when MUTE pin is set High and the power supply voltage becomes lower than 8V.
The speaker output is muted through a soft-mute when detected.
Releasing condition – It will release when MUTE pin is set High and the p ower supply voltage b ecomes more than 9V.
The speaker output is outputted through a soft-start when released.
OUT1P (50, 51pin)
VCCA (25pin)
Speaker output
ERROR (24pin)
OUT_DAC2 (22pin)
OUT_DAC1 (23pin)
9V
8V
HiZ-Low
Soft-mute
43msec(fs=48kHz)
3.3V
VCCP1 (53, 54pin)
VCCP2 (28, 29pin)
OUT1N (43, 44pin)
OUT2N (38, 39pin)
OUT2P (31, 32pin)
t
t
t
t
t
Soft-start
43msec(fs=48kHz)
Technical Note
20/31
BD5446EFV
www.rohm.com 2011.06 - Rev.C
© 2011 ROHM Co., Ltd. All rights reserved.
3) Clock stop protection
This IC has the clock stop protection circuit that make the speaker output mute when the SYS_CLK signal of the digital
audio input stops.
Detecting condition - It will detect when MUTE pin is set Hig h and the SYS_CLK signal st ops for about 1usec or more.
The speaker output is muted through a soft-mute when detected.
Releasing condition - It will release when MUTE pin is set High and the SYS_CLK signal returns to the normal clock
operation. The speaker output is outputted through a soft-start when released.
OUT1P (50, 51pin)
SYS_CLK (7pin)
Speaker output
ERROR (24pin)
OUT_DAC2 (22pin)
OUT_DAC1 (23pin)
Clock stop Clock recover
HiZ-Low
Protection start with
about 1μsec clock stop.
3.3V
Unstable
OUT1N (43, 44pin)
OUT2N (38, 39pin)
OUT2P (31, 32pin)
t
t
t
t
t
Soft-start
43msec(fs=48kHz)
Technical Note
21/31
BD5446EFV
www.rohm.com 2011.06 - Rev.C
© 2011 ROHM Co., Ltd. All rights reserved.
4)Output short protection(Short to the power supply)
This IC has the PWM output short protection circuit that stops the PWM output when the PWM output is short-circuite d to
the power supply due to abnormalit y.
Detecting condition - It will detect when MUTE pin is set High and the current that flows in the PWM output pin
becomes 10A(TYP.) or more. The PWM output instantaneously enters the state of HiZ-Low if
detected, and IC does the latch.
Releasing method - ①After the MUTEX pin is set Low once, the MUTEX pin is set High again.
②Turning on t he power supply again.
5) Output short protection(Short to GND)
This IC has the PWM output short protection circuit that stops the PWM output when the PWM output is short-circuite d to
GND due to abnormality.
Detecting condition - It will detect when MUTE pin is set High and the current that flows in the PWM output terminal
becomes 10A(TYP.) or more. The PWM output instantaneously enters the state of HiZ-Low if
detected, and IC does the latch.
Releasing method – ①After the MUTEX pin is set Low once, the MUTEX pin is set High again.
②Turning on t he power supply again.
ERROR (24pin)
MUTEX(13pin)
Short to GND Release from short to
GND
PWM out ：　IC latches with HiZ-Low. Released from latch state.
１μsec(TYP.)
t
t
t
OUT1P (50, 51pin)
OUT1N (43, 44pin)
OUT2N (38, 39pin)
OUT2P (31, 32pin)
10A(TYP.)
Over current
t
Latch release
ERROR (24pin)
MUTEX（13pin）
Short to VCC Release from short to VCC
PWM out ：　IC latches with HiZ-Low. Released from latch state.
１μsec(TYP.)
t
t
t
OUT1P (50, 51pin)
OUT1N (43, 44pin)
OUT2N (38, 39pin)
OUT2P (31, 32pin)
10A(TYP.)
Over current
t
Latch release
Technical Note
22/31
BD5446EFV
www.rohm.com 2011.06 - Rev.C
© 2011 ROHM Co., Ltd. All rights reserved.
6) DC voltage protection in the speaker
When the DC voltage in the s peaker is im pressed due t o abnorma lity, th is IC has the protection circ uit where the sp eaker
is defended from destruction.
Detecting condition - It will detect when MUTE pin is set High or Low and PWM output Duty=0% or 100% ,
43msec(fs=48kHz) or above. Once detected, The PWM output instantaneously enters the state
of HiZ-Low, and IC does the latch.
Releasing method – ①After the MUTEX pin is set Low once, the MUTEX pin is set High again.
②Turning on t he power supply again
OUT1P (50, 51pin)
Speaker output
Latch release state.
ERROR (24pin)
OUT1N (43, 44pin)
OUT2N (38, 39pin)
OUT2P (31, 32pin)
t
t
t
Soft-start
t
MUTEX(13pin)
Latch release
PWM out locked duty=100% abnormal state. Abnormal state release.
PWM output ：　IC latche with HiZ-Low.
Protection start surge current
into speaker output for 43msec
(fs=48kHz) and over.
43msec(fs=48kHz)
Technical Note
23/31
BD5446EFV
www.rohm.com 2011.06 - Rev.C
© 2011 ROHM Co., Ltd. All rights reserved.
●Output power limiter fu nction
This IC is provided with an output power limiter function to protect speakers from destruction by an excessive output.
Limiter values are freely spec ified b y changi ng external res ist ors R1/R2 as sho wn in Fig-2 6. Fig-27 sho ws a speaker output
waveform that is generated with use of the output limiter function. Becaus e the waveform is soft-clipp ed, unusual nois es on
audible signals are significantly reduced under oper ation of limiter.
Use resistors with a hig h degree of acc uracy for R1 a nd R 2 (±1% or hi gher accurac y is recommende d). The capac itor C is
for the noise removal of output power limitation terminal (3pin). Provide grounding with a 1µF capacitor. Specify a resisto r of
10kΩ or higher resistor R1 and R2. If the output po wer limiter function is not used, R1, R2 and C is u nnecessary. However,
connect 3pin with GNDA.
Fig-29
Fig-30
0
1
2
3
4
5
6
7
8
9
10
1 1.2 1.4 1.6 1.8 2
3pin terminal voltage [V]
OUTPUT POWER( W/ch) .
Fig.31
Output power
3
p
in terminal volta
g
e
35
1μF
1μF
R2
R1
REG_3
Power
Limiter
C
GNDA
5pin
3.3V
Speaker
output
Soft Clip
VCC=13V, RL=8Ω, f=1kHz
Gain=20dB, 5pin=3 .3V
Technical Note
24/31
BD5446EFV
www.rohm.com 2011.06 - Rev.C
© 2011 ROHM Co., Ltd. All rights reserved.
●Application Circuit Example(RL_SP=8Ω)
40
39
38
37
36
35
34
33
32
31
30
29
48
47
46
45
44
43
42
41
28
3
4
5
6
7
8
9
14
15
16
17
18
19
20
21
10
11
12
13
22
23
24
51
50
49
54
53
52
27
26
25
MUTEＸ
PDX
3.3V
VSS
LRCLK
(fs=32kHz～48kHz)
BCLK (64fs)
SDATA2
SDATA1
I2S/LJ
Interface
Gain
Selector
PWM
Modulator
×8 Over
Sampling
Digital
Filter
Control
Interface
TEST
DAC
Selector
High Temperature Protection
Under Voltage Protection
Clock Stop Protection
Output Short Protection
Output DC Voltage Protection
OUT_DAC1
1μF
OUT_DAC2
1μF
RESETＸ
1
2
SYS_CLK (256fs)
100kΩ
ERROR
GNDA
3.3V
VCCA
10μF
VCCA
NC
REG_G2
GNDA
1μF
FILA
Power
Limiter
GNDA
μ-con
DAC
REG_3
1μF
REG_G1
Driver
1P
Driver
1N GNDP1
REG_G1
REG_G1
VCCP1
NC
VCCP1
GNDP1
1μF
22μH
22μH
220μF
0.068μF
0.33μF
GNDP1 0.068μF
1μF
8Ω
NC
NC
Driver
2P
Driver
2N
GNDP2
REG_G2
REG_G2
VCCP2
NC
NC
NC
VCCP2
GNDP2
1μF
22μH
22μH
220μF
0.068μF
0.33μF
GNDP2 0.068μF
1μF
Lch
(SDATA1)
GNDP2
3.3μF
GNDP1
3.3μF
( )
( )
NC
(Rch)
(Lch)
8Ω
Rch
(SDATA1)
I2S/LJ
Selector
1μF
FILP
5.6Ω
470pF
5.6Ω
470pF
5.6Ω
470pF
5.6Ω
470pF
( )
VSS
GNDA
0.1μF
1μF
1μF
C1
C2
C4
C5
C22
C23
R24
C25
C25D
C27
L31
C31A
C31B
R38B
C28D
C31
C28
C38B
C38A
L38
C38
C42
L43
C43A
C43B
R43B
C53 C53D
R50B
C50B
C50A
C43C
L50
C49
R31B
C31C
0
0
0
0
0
Digital Audio
Source
(NOP)
Technical Note
25/31
BD5446EFV
www.rohm.com 2011.06 - Rev.C
© 2011 ROHM Co., Ltd. All rights reserved.
●BOM list(RL_SP=8Ω)
Parts Parts No. Value Company Product No. Rated
Voltage Tolerance Size
IC U1 － ROHM BD5446EFV － － 18.5mm×9.5mm
Inductor L31, L38, L43, L50 22μH
TOKO 1168ER-0001 - (±20%) 10.3mm×7.6mm
SAGAMI DBE7210H-220M - (±20%) 10.5mm×6.4mm
Resistor R31B, R38B
R43B, R50B 5.6Ω ROHM MCR18PZHZFL5R60 1/4W F(±1%) 3.2mm×1.6mm
Capacitor
C31, C38, C42, C49 1μF
MURATA
GRM185B31C105KE43 16V B(±10%） 1.6mm×0.8mm
C25, C28, C53 0.1μF GRM188B31H104KA92 50V B(±10%） 1.6mm×0.8mm
C31A, C38A
C43A, C50A 0.068μF GRM21BB11H683KA01 50V B(±10%） 2.0mm×1.25mm
C31C, C43C 0.33μF GRM219B31H334KA87 50V B(±10%） 2.0mm×1.25mm
C1, C27 3.3μF GRM188B31A335KE15 10V B(±10%） 1.6mm×0.8mm
C2, C4, C5
C22, C23 1μF GRM185B30J105KE25 6.3V B(±10%） 1.6mm×0.8mm
C31B, C38B
C43B, C50B 470pF GRM188B11H471KA 50V B(±10%） 2.0mm×1.2mm
Electrolytic
Capacitor
C28D, C53D 220μF
Panasonic
ECA1VMH221 35V ±20% φ8mm×11.5mm
C25D 10μF EEUFC1H100L 50V ±20% φ5mm×11mm
Technical Note
26/31
BD5446EFV
www.rohm.com 2011.06 - Rev.C
© 2011 ROHM Co., Ltd. All rights reserved.
●Application Circuit Example(RL_SP=6Ω)
40
39
38
37
36
35
34
33
32
31
30
29
48
47
46
45
44
43
42
41
28
3
4
5
6
7
8
9
14
15
16
17
18
19
20
21
10
11
12
13
22
23
24
51
50
49
54
53
52
27
26
25
MUTEＸ
PDX
3.3V
VSS
I2S/LJ
Interface
Gain
Selector
PWM
Modulator
×8 Over
Sampling
Digital
Filter
Control
Interface
TEST
DAC
Selector
High Temperature Protection
Under Voltage Protection
Clock Stop Protection
Output Short Protection
Output DC Voltage Protection
OUT_DAC1
1μF
OUT_DAC2
1μF
RESETＸ
1
2
100kΩ
ERROR
GNDA
3.3V
VCCA
10μF
VCCA
NC
REG_G2
GNDA
1μF
FILA
Power
Limiter
GNDA
μ-con
DAC
REG_3
1μF
REG_G1
Driver
1P
Driver
1N GNDP1
REG_G1
REG_G1
VCCP1
NC
VCCP1
GNDP1
1μF
15μH
15μH
220μF
0.1μF
0.47μF
GNDP1 0.1μF
1μF
6Ω
NC
NC
Driver
2P
Driver
2N
GNDP2
REG_G2
REG_G2
VCCP2
NC
NC
NC
VCCP2
GNDP2
1μF
15μH
15μH
220μF
0.1μF
0.47μF
GNDP2 0.1μF
1μF
Lch
(SDATA1)
GNDP2
3.3μF
GNDP1
3.3μF
( )
( )
NC
(Rch)
(Lch)
6Ω
Rch
(SDATA1)
I2S/LJ
Selector
1μF
FILP
5.6Ω
470pF
5.6Ω
470pF
5.6Ω
470pF
5.6Ω
470pF
( )
VSS
GNDA
0.1μF
1μF
1μF
C1
C2
C4
C5
C22
C23
R24
C25
C25D
C27
L31
C31A
C31B
R38B
C28D
C31
C28
C38B
C38A
L38
C38
C42
L43
C43A
C43B
R43B
C53 C53D
R50B
C50B
C50A
C43C
L50
C49
R31B
C31C
LRCLK
(fs=32kHz～48kHz)
BCLK (64fs)
SDATA2
SDATA1
SYS_CLK (256fs) 0
0
0
0
0
(NOP)
Digital Audio
Source
Technical Note
27/31
BD5446EFV
www.rohm.com 2011.06 - Rev.C
© 2011 ROHM Co., Ltd. All rights reserved.
●BOM list(RL_SP=6Ω)
Parts Parts No. Value Company Product No. Rated
Voltage Tolerance Size
IC U1 － ROHM BD5446EFV － － 18.5mm×9.5mm
Inductor L31, L38, L43, L50 15μH SAGAMI DBE7210H-150M － (±20%) 10.5mm×6.4mm
Resistor R31B, R38B
R43B, R50B 5.6Ω ROHM MCR18PZHZFL5R60 1/4W F(±1%) 3.2mm×1.6mm
Capacitor
C31, C38, C42, C49 1µF
MURATA
GRM185B31C105KE43 16V B(±10%） 1.6mm×0.8mm
C25, C28, C53, C31A,
C38A, C43A, C48A 0.1μF GRM188B31H104KA92 50V B(±10%） 1.6mm×0.8mm
C31C, C43C 0.47μF GRM21BB31H474KA87 50V B(±10%） 2.0mm×1.2mm
C1, C27 3.3μF GRM188B31A335KE15 10V B(±10%） 1.6mm×0.8mm
C2, C4, C5
C22, C23 1μF GRM185B30J105KE25 6.3V B(±10%） 1.6mm×0.8mm
C31B, C38B
C43B, C50B 470pF GRM188B11H471KA 50V B(±10%） 2.0mm×1.2mm
Electrolytic
Capacitor
C28D, C53D 220μF
Panasonic
ECA1VMH221 35V ±20% φ8mm×11.5mm
C25D 10μF EEUFC1H100L 50V ±20% φ5mm×11mm
Technical Note
28/31
BD5446EFV
www.rohm.com 2011.06 - Rev.C
© 2011 ROHM Co., Ltd. All rights reserved.
●Output LC Filter Circuit
An output filter is required to eliminate radio-frequency components exceeding the audio-frequency region supplied to a
load (speaker). Because this IC uses sampling clock frequencies from 200kHz to 400kHz in the output PWM signals, the
high-frequency components must be appropriately removed.
This section takes an example of an LC type LPF shown in Fig.29, in which coil L and capacitor C compose a differential
filter with an attenuation propert y of -12dB/oct. A large part of s witching currents flo w to capacitor C, and on ly a small part
of the currents flow to speaker
R
L
. This filter reduces unwanted emission this way. In addition, coil L and capacitor Cg
compose a filter against in-phase comp one nts, reducing unwanted emission further.
Filter constants depend on load imped ances. The follo wing are formulas to calculate values of
L, C,
and
Cg
when Q=0.707
is specified.
Fig. 29
R
L
: Load impedance (Ω)
f
C
: LPF cut off frequency (Hz)
Following presents output LC filter constants with typical load impedances.
f
C
= 30kHz
f
C
= 40kHz
RL L C Cg RL L C Cg
6Ω 22µH 0.68µF 0.15µF 6Ω 15µH 0.47µF 0.1µF
8Ω 33µH 0.47µF 0.1µF 8Ω 22µH 0.33µF 0.068µF
16Ω 68µH 0.22µF 0.047µF 16Ω 47µH 0.15µF 0.033µF
Use coils with a low direct-current resistance and with a sufficient margin of allowable currents. A high direct-current
resistance causes power losses. In addition, select a closed magnetic circuit type product in normal cases to prevent
unwanted emission.
Use capacitors with a low equivalent series resistance, and good impedance characteristics at high frequency ranges
(100kHz or higher). Also, select an item with sufficient withstand voltage because flowing massive amount of
high-frequency currents is expected.
L
LC
Cg
CgRL
4 8 , 4 9
3 8 , 3 9
4 5 , 4 6
3 3 , 3 4
o
r
o
r
L＝RL2
4 π
f
CH
C＝
2 π
f
C R
L2
1 F
Cg ＝0 . 2 C F
Technical Note
29/31
BD5446EFV
www.rohm.com 2011.06 - Rev.C
© 2011 ROHM Co., Ltd. All rights reserved.
●Notes for use
1 ) Absolute maximum ratings
Use of the IC in excess of absolute maximum ratings such as the applied voltage or operating temperature range may result in IC
damage. Assumptions should not be made regarding the state of the IC (short mode or open mode) when such damage is suffered. A
physical safety measure such as a fuse should be implemented when use of the IC in a special mode where the absolute maximum
ratings may be exceeded is anticipated.
2 ) Power supply lines
As return of current regenerated by back EMF of output coil happens, take steps such as putting capacitor between power supply and
GND as a electric pathway for the regenerated cu rrent. Be sure th at there is no problem with each p roperty such as emptied capacity at
lower temperature regarding electrolytic capacitor to decide capacity value. If the connected power supply does not have sufficient
current absorption capacity, regenerative current will cause the voltage on the power supply line to rise, which combined with the p roduct
and its peripheral circuitry may exceed the absolute maximum ratings. It is recommended to implement a physical safety measure such
as the insertion of a voltage clamp diode between the power supply and GND pins.
3 ) GND potential(Pin 6, 36, 37, 45, 46).
Any state must become the lowest voltage about GND terminal and VSS terminal.
4 ) Input terminal
The parasitic elements are formed in the IC becau se of the voltage relation. The parasitic element operating causes the wrong operation
and destruction. Therefore, please be careful so as not to operate the parasitic elements by impressing to input terminals lower voltage
than GND and VSS. Please do not apply the voltage to the input terminal when the power-supply voltage is not impressed.
5 ) Setting of heat
Use a thermal design that allows for a sufficient margin in light of the power dissipation (Pd) in actual operating conditions. This IC
exposes its frame of the backside of package. Note that this part is assumed to use after providing heat dissipation treatment to improve
heat dissipation efficiency. Try to occupy as wide as possible with heat dissipation pattern not only on the board surface but also the
backside.
Class D speaker amplifier is high efficiency and low heat generation by comparison with conventional Analog power amplifier. Ho wever,
In case it is operated continuously by maximum output power, Power dissipation (Pdiss) may exceed package dissipation. Please
consider about heat design that Power dissipation (Pdiss) does not exceed Package dissipation (Pd) in average power (Poav). (Tjma x :
Maximum junction temperature=150℃, Ta : Peripheral temperature[℃], θja : Thermal resistance of package[℃/W], Poav : Average
power[W], η : Efficiency)
Package dissipation : Pd(W)=(Tjmax - Ta)/θja
Power dissipation : Pdiss(W)= Poav ×(1/η- 1)
6 ) Actions in strong magnetic field
Use caution when using the IC in the presence of a strong magnetic field as doing so may cause the IC to malfunction.
7 ) Thermal shutdown circuit
This product is provided with a built-in thermal shutdown circuit. When the thermal shutdown circuit operates, the output transistors are
placed under open status. The thermal shutdown circuit is primarily intended to shut down the IC avoiding thermal runaway under
abnormal conditions with a chip temperature exceeding Tjmax = 150℃.
8 ) Shorts between pins and misinstallation
When mounting the IC on a boa rd, pay adequate attention to orientation and placement discrepancies of the IC. If it is misinstalled and
the power is turned on, the IC may be damaged. It also may be da maged if it is shorted by a foreign substance coming between pins of
the IC or between a pin and a power supply or a pin and a GND.
9 ) Power supply on/off (Pin 25, 28, 29, 53, 54)
In case power supply is started up, RESETX(Pin 12), MUTEX(Pin 13) and PDX (Pin 14) always should be set Low. And in case p ower
supply is shut down, it should be set Low likewise. Then it is possible to eliminate pop noise when power supply is turned on/off. And also,
all power supply terminals should start up and shut down together.
10 ) ERROR terminal(Pin 24)
A error flag is outputted when Output short protection and DC voltage protection in the speaker are operated. These flags are the
function which the condition of this product is shown in.
11 ) N.C. terminal(Pin 26, 30, 34, 35, 41, 47, 48, 52)
N.C. terminal (Non Connection Pin) does not connect to the inside circuit. Therefore, possible to use open.
12 ) TEST terminal(Pin 19, 20)
TEST terminal connects with ground to prevent the malfunction by external noise.
13 ) Precautions for Spealer-setting
If the impedance characteristics of the speakers at high-frequency range while increase rapidly, the IC might not have stable-operation
in the resonance frequency range of the LC-filter. Therefore, consider adding damping-circuit, etc., depending on the impedance of
the speaker.
14) Notes about the phase of SYS_CLK (Pin7) and BCLK (Pin8)
If the rising edge of SYS_CLK (Pin7) and BCLK (Pin8) becomes simultaneous, noise or sound shutdown may occur.
Please cope with it, when the rising edge of CYC_CLK and BCLK becomes simultaneous. (Example: Insert RC filter in BCLK)
Technical Note
30/31
BD5446EFV
www.rohm.com 2011.06 - Rev.C
© 2011 ROHM Co., Ltd. All rights reserved.
●Allowable P ower Dissipation
Measuring instrument : TH-156(Shibukawa Kuwano Electrical Instruments Co., Ltd.)
Measuring conditions : Installation on ROHM’s board
Board size : 70mm×70mm×1.6mm( with thermal via on board)
Material : FR4
・The board on exposed h ea t sink on the back of package are connected by soldering.
PCB① : 1-layer board(back copper foil size : 0mm×0mm), θja＝62.5℃/W
PCB② : 2-layer board(back copper foil size : 70mm×70mm),θja＝27.8℃/W
PCB③ : 4-layer board(back copper foil size : 70mm×70mm),θja＝20.2℃/W
0
1
2
3
4
5
6
7
0 10 20 30 40 50 60 70 80 90 100 110 120 130 140 150
Ambient Temperature:Ta(℃)
Power Dissipation Pd （W)
PCB③ 6.2W
PCB② 4.5W
PCB① 2.0W
Technical Note
31/31
BD5446EFV
www.rohm.com 2011.06 - Rev.C
© 2011 ROHM Co., Ltd. All rights reserved.
●Ordering part number
B D 5 4 4 6 E F V - E 2
Part No. Part No.
Package
EFV : HTSSOP-B54 Packaging and forming specific ation
E2: Embossed tape and reel
(Unit : mm)
HTSSOP-B54
0.85±0.05
0.08±0.05
0.65
1.0MAX
0.22+0.05
-
0.04 0.08
M
S
0.08
54 28
271
18.5±0.1
(5.0)
(6.0)
9.5±0.2
7.5±0.1
0.8
(MAX 18.85 include BURR)
1PIN MARK
0.5±0.15
1.0±0.2
0.17+0.05
-
0.03
S
4°
+
6°
−
4°
∗
Order quantity needs to be multiple of the minimum quantity.
<Tape and Reel information>
Embossed carrier tape (with dry pack)Tape
Quantity
Direction
of feed
The direction is the 1pin of product is at the upper left when you hold
reel on the left hand and you pull out the tape on the right hand
1500pcs
E2
()
Direction of feed
Reel 1pin
Datasheet
Datasheet
Notice - GE Rev.002
© 2014 ROHM Co., Ltd. All rights reserved.
Notice
Precaution on using ROHM Products
1. Our Products are designed and manufactured for application in ordinary electronic equipments (such as AV equipment,
OA equipment, telecommunication equipment, home electronic appliances, amusement equipment, etc.). If you
intend to use our Products in devices requiring extremely high reliability (such as medical equipment (Note 1), transport
equipment, traffic equipment, aircraft/spacecraft, nuclear power controllers, fuel controllers, car equipment including car
accessories, safety devices, etc.) and whose malfunction or failure may cause loss of human life, bodily injury or
serious damage to property (“Specific Applications”), please consult with the ROHM sales representative in advance.
Unless otherwise agreed in writing by ROHM in advance, ROHM shall not be in any way responsible or liable for any
damages, expenses or losses incurred by you or third parties arising from the use of any ROHM’s Products for Specific
Applications.
(Note1) Medical Equipment Classification of the Specific Applications
JAPAN USA EU CHINA
CLASSⅢ CLASSⅢ CLASSⅡb CLASSⅢ
CLASSⅣ CLASSⅢ
2. ROHM designs and manufactures its Products subject to strict quality control system. However, semiconductor
products can fail or malfunction at a certain rate. Please be sure to implement, at your own responsibilities, adequate
safety measures including but not limited to fail-safe design against the physical injury, damage to any property, which
a failure or malfunction of our Products may cause. The following are examples of safety measures:
[a] Installation of protection circuits or other protective devices to improve system safety
[b] Installation of redundant circuits to reduce the impact of single or multiple circuit failure
3. Our Products are designed and manufactured for use under standard conditions and not under any special or
extraordinary environments or conditions, as exemplified below. Accordingly, ROHM shall not be in any way
responsible or liable for any damages, expenses or losses arising from the use of any ROHM’s Products under any
special or extraordinary environments or conditions. If you intend to use our Products under any special or
extraordinary environments or conditions (as exemplified below), your independent verification and confirmation of
product performance, reliability, etc, prior to use, must be necessary:
[a] Use of our Products in any types of liquid, including water, oils, chemicals, and organic solvents
[b] Use of our Products outdoors or in places where the Products are exposed to direct sunlight or dust
[c] Use of our Products in places where the Products are exposed to sea wind or corrosive gases, including Cl2,
H2S, NH3, SO2, and NO2
[d] Use of our Products in places where the Products are exposed to static electricity or electromagnetic waves
[e] Use of our Products in proximity to heat-producing components, plastic cords, or other flammable items
[f] Sealing or coating our Products with resin or other coating materials
[g] Use of our Products without cleaning residue of flux (even if you use no-clean type fluxes, cleaning residue of
flux is recommended); or Washing our Products by using water or water-soluble cleaning agents for cleaning
residue after soldering
[h] Use of the Products in places subject to dew condensation
4. The Products are not subject to radiation-proof design.
5. Please verify and confirm characteristics of the final or mounted products in using the Products.
6. In particular, if a transient load (a large amount of load applied in a short period of time, such as pulse. is applied,
confirmation of performance characteristics after on-board mounting is strongly recommended. Avoid applying power
exceeding normal rated power; exceeding the power rating under steady-state loading condition may negatively affect
product performance and reliability.
7. De-rate Power Dissipation (Pd) depending on Ambient temperature (Ta). When used in sealed area, confirm the actual
ambient temperature.
8. Confirm that operation temperature is within the specified range described in the product specification.
9. ROHM shall not be in any way responsible or liable for failure induced under deviant condition from what is defined in
this document.
Precaution for Mounting / Circuit board design
1. When a highly active halogenous (chlorine, bromine, etc.) flux is used, the residue of flux may negatively affect product
performance and reliability.
2. In principle, the reflow soldering method must be used; if flow soldering method is preferred, please consult with the
ROHM representative in advance.
For details, please refer to ROHM Mounting specification
Datasheet
Datasheet
Notice - GE Rev.002
© 2014 ROHM Co., Ltd. All rights reserved.
Precautions Regarding Application Examples and External Circuits
1. If change is made to the constant of an external circuit, please allow a sufficient margin considering variations of the
characteristics of the Products and external components, including transient characteristics, as well as static
characteristics.
2. You agree that application notes, reference designs, and associated data and information contained in this document
are presented only as guidance for Products use. Therefore, in case you use such information, you are solely
responsible for it and you must exercise your own independent verification and judgment in the use of such information
contained in this document. ROHM shall not be in any way responsible or liable for any damages, expenses or losses
incurred by you or third parties arising from the use of such information.
Precaution for Electrostatic
This Product is electrostatic sensitive product, which may be damaged due to electrostatic discharge. Please take proper
caution in your manufacturing process and storage so that voltage exceeding the Products maximum rating will not be
applied to Products. Please take special care under dry condition (e.g. Grounding of human body / equipment / solder iron,
isolation from charged objects, setting of Ionizer, friction prevention and temperature / humidity control).
Precaution for Storage / Transportation
1. Product performance and soldered connections may deteriorate if the Products are stored in the places where:
[a] the Products are exposed to sea winds or corrosive gases, including Cl2, H2S, NH3, SO2, and NO2
[b] the temperature or humidity exceeds those recommended by ROHM
[c] the Products are exposed to direct sunshine or condensation
[d] the Products are exposed to high Electrostatic
2. Even under ROHM recommended storage condition, solderability of products out of recommended storage time period
may be degraded. It is strongly recommended to confirm solderability before using Products of which storage time is
exceeding the recommended storage time period.
3. Store / transport cartons in the correct direction, which is indicated on a carton with a symbol. Otherwise bent leads
may occur due to excessive stress applied when dropping of a carton.
4. Use Products within the specified time after opening a humidity barrier bag. Baking is required before using Products of
which storage time is exceeding the recommended storage time period.
Precaution for Product Label
QR code printed on ROHM Products label is for ROHM’s internal use only.
Precaution for Disposition
When disposing Products please dispose them properly using an authorized industry waste company.
Precaution for Foreign Exchange and Foreign Trade act
Since our Products might fall under controlled goods prescribed by the applicable foreign exchange and foreign trade act,
please consult with ROHM representative in case of export.
Precaution Regarding Intellectual Property Rights
1. All information and data including but not limited to application example contained in this document is for reference
only. ROHM does not warrant that foregoing information or data will not infringe any intellectual property rights or any
other rights of any third party regarding such information or data. ROHM shall not be in any way responsible or liable
for infringement of any intellectual property rights or other damages arising from use of such information or data.:
2. No license, expressly or implied, is granted hereby under any intellectual property rights or other rights of ROHM or any
third parties with respect to the information contained in this document.
Other Precaution
1. This document may not be reprinted or reproduced, in whole or in part, without prior written consent of ROHM.
2. The Products may not be disassembled, converted, modified, reproduced or otherwise changed without prior written
consent of ROHM.
3. In no event shall you use in any way whatsoever the Products and the related technical information contained in the
Products or this document for any military purposes, including but not limited to, the development of mass-destruction
weapons.
4. The proper names of companies or products described in this document are trademarks or registered trademarks of
ROHM, its affiliated companies or third parties.
DatasheetDatasheet
Notice – WE Rev.001
© 2014 ROHM Co., Ltd. All rights reserved.
General Precaution
1. Before you use our Pro ducts, you are requested to care fully read this document and fully understand its contents.
ROHM shall n ot be in an y way responsible or liabl e for fa ilure, malfunction or acci dent arising from the use of a ny
ROHM’s Products against warning, caution or note contained in this document.
2. All information contained in this docume nt is current as of the issuing date and subj ect to change without any prior
notice. Before purchasing or using ROHM’s Products, please confirm the la test information with a ROHM sale s
representative.
3. The information contained in this doc ument is provi ded on an “as is” basis and ROHM does not warrant that all
information contained in this document is accurate an d/or error-free. ROHM shall not be in an y way responsible or
liable for an y damages, expenses or losses incurred b y you or third parties resulting from inaccur acy or errors of or
concerning such information.
Datasheet
Part Number bd5446efv
Package HTSSOP-B54
Unit Quantity 1500
Minimum Package Quantity 1500
Packing Type Taping
Constitution Materials List inquiry
RoHS Yes
bd5446efv - Web Page