TA8201AK
2002-10-30
1
TOSHIBA Bipolar Linear Integrated Circuit Silicon Monolithic
TA8201AK
BTL Audio Power Amplifier
The TA8201AK is a audio power amplifier for consumer
application.
This IC is applying BTL system in which output coupling
condenser and bootstrap condenser are not necessary and output
17W (VCC = 14.4V, BL =4Ω, THD = 10%) can be obtained.
Since the package is a 7 pin SIP, (signal inline package), it
greatly simplifies construction of a power amplifier both in design
and assembly.
It also contains various kind of protector.
It is suitable for car−audio power amplifier with high
performance.
Features
· High power: POUT (1) = 17W (typ.)
(VCC = 14.4V, f = 1kHz, THD = 10%, RL = 4Ω)
: POUT (2) = 14W (typ.)
(VCC = 13.2V, f = 1kHz, THD = 10%, RL = 4Ω)
· Very few external parts
· Built in protector circuit
Thermal shut down, over voltage protector (typ. VCC = 24V)
ASO protector (RL short, Out to GND, Out to VCC)
· 7 pin small package
· Operating supply voltage range: VCC = 9~18V
Weight: 2.19g (typ.)
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2002-10-30
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Block Diagram
Directions For Use And Application Method
1. Voltage gain adjustment
This IC has the amplifier construction as shown in Fig.1. The pre-amp. Amp 1 is provided to the primary stage,
and the input voltage is amplified by the flat amps, amp 3 and amp 4 of each channel through the phase amp.
Amp 2.
Since the input offset is prevented by pre-amp when VCC is set to on, this circuit can remarkable reduce the pop
noise.
The total closed loop gain GV of this IC can be obtained by expression below when the closed loop voltage gain of
amp 1 is GV1.
(dB)
R2
f
R
R2)
f
(RR1
og20
V1
G+
++
=l ..... (1)
The closed loop voltage gain of power amp, amp 3 and amp 4 is fixed at GV3≒GV4 = 20dB.
Therefore, the total closed circuit voltage gain GV is obtained through BTL connection by the expression below.
GV = GV1+GV3+6 (dB) ............. (2)
＋
－
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For example, when Rf = 0Ω, GV is obtained by
the expression below.
GV≒28+20+6 = 54 (dB)
The voltage gain is reduced when Rf is
increased. (Fig.2)
With the voltage gain reduced, since (1) the
oscillation stability is reduced, and (2) the pop
noise changes when VCC is set to on, refer to
the items 2 and 4.
2. Capacitive value of input and NF capacitor
This IC has the built-in circuit which makes the input voltage of amp. 1 and the voltage of NF terminal equal at
VCC → on by means of providing the pre-amp (amp 1) at the first stage.
Therefore, the off-set voltage produced at the first stage is suppressed, and the pop noise is prevented.
Set the capacitive value of input and NF capacitor according to the gain to be used.
[Reference] (A) At GV = 54dB (Rf = 0) CIN = 4.7µF, CNF = 47µF
(B) At GV = 40dB (Rf = 560Ω) CIN = 3.3µF, CNF = 33µF
3. Capacitance of ripple filter capacitor
The capacitance of the ripple filter capacitor of (3) pin determines the time constant at VCC → on and VCC → off.
Since the pop noise varies according to the capacitance of the ripple filter capacitor, C3 =220µF recommended.
Having the built-in rapid discharging circuit of ripple and NF voltage at the time when VCC → off, this IC is
effective for preventing the pop noise of VCC continuous on / off.
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4. Preventive measure against oscillation
For preventing the oscillation, it is advisable to use C4, the condenser of polyester film having small
characteristic fluctuation of the temperature and the frequency.
The resistance R to be series applied to C4 is effective for phase correction of high frequency, and improves the
oscillation allowance.
Since the oscillation allowance is varied according to the causes described below, perform the temperature test to
check the oscillation allowance.
(1) Voltage gain to be used (GV setting)
(2) Capacity value condenser
(3) Kind of condenser
(4) layout of printed board
By increasing Rf, decrease of GV is possible.
However, care must be taken since the feedback increase is liable to produce oscillation.
5 External part list and description
Influence
Symbol Recommended
Value Feature Smaller Than
Recommended
Value
Larger Than
Recommended
Value
Remarks
C1 4.7µF DC blocking Related to popping noise at VCC → on
Related to popping noise at VCC → on
Related to gain.
Refer to item2.
C2 47µF
Feedback
condenser
Determination of low cut-off frequency.
f
R
L
f2
1
C2 ×p
=
C3 220µF
Ripple
reduction
Time constant is
small at VCC → on
or off.
Time constant is
large at VCC → on or off. Refer to item3.
C4 0.15µF
Oscillation
prevention
Made liable to
oscillate.
Oscillation allowance
improved. Refer to item4.
C5 1000µF
Ripple
filter
For filtering power supply hum and ripple.
Large at using AC rectified power supply.
Small at using DC power supply.
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2002-10-30
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Maximum Ratings (Ta = 25°C)
Characteristic Symbol Rating Unit
Peak supply voltage (0.2 sec) VCC (surge) 50 V
DC supply voltage VCC (DC) 25 V
Operating supply voltage VCC (opr) 18 V
Output current (peak) IO (peak) 4.5 A
Power dissipation PD 15 W
Operating temperature Topr -30~85 °C
Storage temperature Tstg -55~150 °C
Electrical Characteristics
(unless otherwise specified, VCC = 13.2V, RL = 4Ω, f = 1kHz, Ta = 25°C)
Characteristic Symbol
Test
Cir-
cuit
Test Condition Min. Typ. Max. Unit
Quiescent current ICCQ ― V
IN = 0 ― 60 95 µA
POUT (1) ― V
CC = 14.4V, THD = 10% ― 17 ―
Output power
POUT (2) ― THD = 10% 10 14 ―
W
Total harmonic
distortion THD ― P
OUT = 1W ― 0.05 0.4 %
Voltage gain GV ― R
f = 0Ω 52 54 56 dB
Output noise voltage VNO ― R
g = 10kΩ, BW = 20Hz~20kHz ― 0.9 2.0 mVrms
Ripple rejection ratio R.R. ― Fripple = 100Hz, Rg= 600Ω 40 50 ― dB
Input resistance RIN ― f
= 1kHz ― 30 ― kΩ
Output offset voltage Voffset ― V
IN = 0 -0.3 0 0.3 V
Typical DC Voltage Of Each Terminal (VCC = 13.2V, VIN = 0V, Ta = 25°C)
Terminal No. 1 2 3 4 5 6 7
Terminal In NF R.F GND Out VCC Out
DC voltage (V) 4.55 4.55 4.55 0 5.6 13.2 5.6
Test Circuit / Applecation Circuit
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2002-10-30
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Package Dimensions
Weight: 2.19g (typ.)
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2002-10-30
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· This product generates heat during normal operation. However, substandard performance or malfunction may
cause the product and its peripherals to reach abnormally high temperatures.
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000707EBF
RESTRICTIONS ON PRODUCT USE
