Specifications of any and all SANYO Semiconductor Co.,Ltd. products described or contained herein stipulate
the performance, characteristics, and functions of the described products in the independent state, and are not
guarantees of the performance, characteristics, and functions of the described products as mounted in the
customer
'
s products or equipment. To verify symptoms and states that cannot be evaluated in an independent
device, the customer should always evaluate and test devices mounted in the customer
'
sproductsor
equipment.
Any and all SANYO Semiconductor Co.,Ltd. products described or contained herein are, with regard to
"standard application", intended for the use as general electronics equipment (home appliances, AV equipment,
communication device, office equipment, industrial equipment etc.). The products mentioned herein shall not be
intended for use for any "special application" (medical equipment whose purpose is to sustain life, aerospace
instrument, nuclear control device, burning appliances, transportation machine, traffic signal system, safety
equipment etc.) that shall require extremely high level of reliability and can directly threaten human lives in case
of failure or malfunction of the product or may cause harm to human bodies, nor shall they grant any guarantee
thereof. If you should intend to use our products for applications outside the standard applications of our
customer who is considering such use and/or outside the scope of our intended standard applications, please
consult with us prior to the intended use. If there is no consultation or inquiry before the intended use, our
customer shall be solely responsible for the use.
82008 MS JK/21500TH (KT)/33194HO/0237KI/8064KI/4034KI, TS No.1463-1/9
LA4265
Overview
LA4265 is a 3.5W monaural power amplifier.
Features
• Minimum number of external parts required (No input capacitor, bootstrap capacitor required).
• High output : 3.5W typ (VCC = 16V, RL = 8Ω, THD = 10%).
• Soft clip, causing little harmonic disturbance to radios.
• Small pop noise at the time of power switch ON/OFF.
• Built-in protector against abnormal modes (Thermal shutdown, overvoltage)
Specifications
Absolute Maximum Ratings at Ta = 25°C
Parameter Symbol Conditions Ratings Unit
Maximum supply voltage VCC max 25 V
Maximum output current IO Peak 2A
Allowable power dissipation Pd max With 100×120×1.5mm3 Al heat sink 7.5 W
Operating temperature Topr −20 to +75 °C
Storage temperature Tstg −40 to +150
°C
Operating Conditions at Ta = 25°C
Parameter Symbol Conditions Ratings Unit
Recommended supply voltage VCC 16 V
Recommended load resistance RL 8Ω
Operating supply voltage range VCC 9 to 24 V
Monolithic Linear IC
3.5W Monaural Power Amplifier
Orderin
g
numbe
r
: EN1463D
LA4265
No.1463-2/9
Electrical Characteristics at Ta = 25°C, VCC = 16V, RL = 8Ω, f = 1kHz, Rg = 600Ω, See specified test circuit
(based on sample application circuit).
Ratings
Parameter Symbol Conditions min typ max
Unit
Quiescent current ICCO 35 50 mA
Voltage gain VG 48 50 52 dB
Qutput power PO THD = 10% 3.0 3.5 W
Total harmonic distortion THD PO = 0.5W 0.3 1.0 %
Output noise voltage VNO Rg = 10kΩ, BPF = 20Hz to 20kHz 0.65 1.5 mV
Ripple rejection SVRR Rg = 0, fR = 100Hz, VR = 0.5V 40 50 dB
Package Dimensions
unit : mm (typ)
3018B
Allowable power dissipation, Pd max -- W
8
7
6
5
4
3
2
1
0
-20 0 20 40 60 80 100 120 140 160
Pd max -- Ta
Infinite heat sink
No heat sink
Al heat sink
mounting torque
39N cm
Silicone grease
applied
Thermal
resistance
between junc-
tion and
outside
air
θj-c
10˚C/W
50×50×1.5mm
3
100×120×1.5mm3
7.5
2.5
Ambient temperature, Ta -- °C
Block Diagram
6
5
2
9
8
10
3
7 1
decoupling
clipper
diode overvolt.
protect.
ripple
filter thermal
protect.
pre
driver
phase
comp
1phase
comp
2
input
feedback 56Ωinput output output
20kΩ
GND
VCC
25.2
24.0
12.0
25.75 max
1.6 min
3.5 13.5
3.6
(8.4)
16.7 max
110
1.3 0.5
2.54
(1.17) 1.6
0.45
(R3.6)
SANYO : SIP10FD
LA4265
No.1463-3/9
Sample Application Circuit 1
(Recommended circuit) Sample Application Circuit 2
(Circuit with minimum number of external parts)
5 3
2
6
8
10
97 1
C6
100μF
/25V
input
C1
330pF R1
100kΩ
C2
100μF/6.3V * polyester film cap.
VCC
C5
470μF
/25V
C4 470μF/16V
C3
0.1μF
*
R2
3.3Ω
RL
8Ω
+
+
+
+
LA4265
5 3
2
6
8
10
97 1
input
C2
100μF/6.3V * polyester film cap.
VCC
C5
470μF
/25V
C3
0.1μF
*
R2
3.3Ω
RL
8Ω
C6
100μF
/25V
+
+
+
C4 470μF/16V
+
VR
30kΩLA4265
Sample Printed Circuit Pattern
VCC
*
input 330pF++
GND
100kΩ
100μF
25V
3.3Ω0.1μF
+470μF
/25V
GND
output
+
470μF/16V
10
1
100μF
/6.3V
Cu-foiled area
55
×
57.5mm
2
* Polyester film capacitor
Thermal resistance of heat sink, θf -- ˚C/W
θf -- Sf
5
3
2
10
7
5
3
223 57
100 23 57
1000 2
Al heat sink t = 1.5mm
Area of heat sink, Sf -- cm2
LA4265
No.1463-4/9
Description of External Parts
C1 (330pF) : Input short capacitor.
Reduces the high frequency noise when the input impedance is increased. Not required when the input
impedance is decreased.
C2 (100μF) : Feedback capacitor.
Decreasing the capacitance value lowers the low frequency response. Increasing the capacitance value
makes the starting time later.
C3 (0.1μF
polyester film
capacitor)
: Oscillation blocking capacitor.
Decreasing the capacitance value causes oscillation to occur easily. Use a polyester film capacitor that
is good in high frequency response and temperature characteristic. The use of an electrolytic capacitor
may cause oscillation to occur at low temperatures.
C4 (470μF) : Output capacitor.
Decreasing the capacitance value causes insufficient power at low frequencies.
C5 (470μF) : Power capacitor.
Decreasing the capacitance value causes ripple to occur easily. Locating at a distance from the IC or
removing this capacitor may cause oscillation to o ccur.
C6 (100μF) : Ripple filter capacitor.
Decreasing the capacitance value excessively or removing this capacitor causes ripple to occur.
However, increasing the capacitance value does not always cause ripple to be reduced. Decreasing the
capacitance value makes the starting time earlier.
R1 (100kΩ) : Input bias resistor.
Determines the bias (bias of zero potential) to be applied to the input pin and the input impedance. Not
required if a variable resistor is also used as this resistor.
R2 (3.3Ω) : Resistor connected in series with oscillation blocking capacitor.
Prevents phase shift attributable to the oscillation blocking capacitor so that oscillation is hard to occur.
Note for Changing Voltage Gain
The voltage ga i n can be reduced by a dding an external resi s t or (RNF) in series with the feedback capacitor. (See VG ·
RNF characteristic curve). However, it should be noted that various characteristics are also changed (THD-VG,
VNO-VG, Vro-VG). The voltage gain must not be reduced to be less than 30dB. Since the frequency response is
extended and oscillation is liable to occur when the voltage gain is reduced, high-cu t must be made as required.
(High-cut is made by connecting a capacitor of approximately 30pF across pins (6) and (7).)
External Muting
If external m uting is required, make the circuit as shown on next page. In thi s case, the pop noise is sim ilar to that which
occurs at the time of power switch ON/OFF. If the value of the series resistor is decreased, more pop noise is hear d at
the time of attack ; if increased, muting is hard to work.
Measure against Fold-back of Output Waveform
Since the input pin is zero-biased, t he circuit may be saturated at an overinput, causing a part of the output waveform to be
folded back (e. g. when the peak input voltage exceeds 600mV). In such a case, the fold-back of the waveform can be
prevented by using the built-in diode (also can be prevented by using an external diode). When the built-in diode is used,
a resistor must be connected in series with the input pin to cause the diode to conduct no ove rcurrent (10m A or less).
LA4265
No.1463-5/9
Fold-back Output Waveform
5 3
2
6 7 1
+
−
200Ω
mute
SW 100μF
ripple filter
++
+
1kΩ
+100μF
RNF
C
470μF
470μF
0.1μF
polyester
film
capaciter
3.3Ω
RL
8Ω
VCC
External muting
Measure against fold-back
Gain adjusting resistor
High-cut capacitor
Fold-back of waveform
8
9
10
Output power, PO -- W
Input voltage, VIN -- mV
10
7
5
3
2
3
2
1.0
1.0
0.1
7
5
7
5
3
257 2 3 7510 23 57
100
PO -- VIN
f
=
1kHz
RL
=
8Ω
12V
14V
VCC
=
16V
Total harmonic distortion, THD -- %
Output power, PO -- W
10
7
5
3
5
7
2
1.0
0.1 0.1 1.0
3
2
23 57 3 5722357
THD -- PO
VCC
=
16V
RL
=
8Ω
f
=
10kHz
100Hz
1kHz
Output power, PO -- W
Frequency, f -- Hz
6
5
2
4
100 1k
3
1
023 57 23 2375 100k
23 75
10k
75
PO -- f
VCC
=
16V
RL
=
8Ω
C4
=
1000μF
THD
=
105%
5%
470μF
Output power, PO -- W
Supply voltage, VCC -- V
6
7
8
5
2
4
3
1
004812162024
PO -- VCC
THD
=
10%
5%
RL
=
8Ω
f
=
1kHz
LA4265
No.1463-6/9
Output power, PO -- W
Power dissipation, Pd -- W
f
=
1kHz
RL
=
8Ω
5
7
3
1.0
0.1 1.0
2
3
5
23 57 23 7510
23 75
Pd -- PO
20V
18V
16V
14V
VCC
=
22V
Current dissipation, ICC -- A
Output power, PO -- W
RL
=
8Ω
VCC
=
16V
5
7
7
3
0.1
1.0
0.1 1.0
2
3
5
23 57 23 75235
ICC -- PO
Total harmonic distortion, THD -- %
Frequency, f -- Hz
7
5
5
7
3
1.0
0.1
10
100 1k 10k 100k
2
3
2
23 57 23 7523752357
THD -- f
VCC
=
16V
RL
=
8Ω
PO
=
0.5W
20pF
10pF
C6-7
=
30pF
No C6-7
2
0
100 1k 10k 100k
-2
-4
-6
-8
-10
-12
-1423 57 23 7523752357
f Response
20pF
10pF
30pF
No C6-7
Frequency, f -- Hz
Response -- dB
Frequency, f -- Hz
VCC
=
16V
RL
=
8Ω
-2
-4
-6
-8
-10
-12
-14
2
0
100 1k 10k 100k
23 57 2 3 7523752357
f Response
100μF
47μF
C2
=
220μF
Response -- dB
Pin voltage, Vpin -- V
Supply voltage, VCC -- V
0
30
40
20
10
04812162024283236
Vpin -- VCC
Pin (5)
Pins (2), (6)
Pins (7), (9) Pin (6)
0
30
50
40
20
10
04812162024283236
ICCO -- VCC
Quiescent current, ICCO -- mA
Supply voltage, VCC -- V
5
7
1.0
10
1k 10k 100k 1000k
3
2
5
7
3
2
23 57 2357 2357 2357
VNO -- Rg
VCC
=
16V
RL
=
8Ω
BW
=
20Hz to 20kHz
FILTER OUT
FILTER IN
Signal source resistance, Rg -- Ω
Output noise voltage, VNO -- mV
No C1
With C1
LA4265
No.1463-7/9
VCC
=
16V
RL
=
8Ω
f
=
1kHz
5
7
0.1
2
3
2
5
7
1.0
3
2
20 30 40 6050
THD -- VG
PO
=
2W
0.5W
7
5
5
7
3
1.0
10
10
2
5
3
2
3
22357 100
23 57 1000
23 2357
VRO -- VCCR
VCC
=
16V
Rg
=
0
fR
=
100Hz
Supply ripple voltage, VCCR -- mV
Output ripple voltage, VRO -- mV
7
5
5
7
3
1.0
10
100
2
5
7
3
2
3
2
3
24 8 12 16 20 2824
VRO -- VCC
VCCR
=
1V
0.5V
0.3V
Rg
=
0
fR
=
100Hz
Output ripple voltage, VRO -- mV
Supply voltage, VCC -- V
Total harmonic distortion, THD -- %
Voltage gain, VG -- dB
10
20
30
40
50
60
10
023 57 100
23 57 1k
23 2357
VG -- RNF
VCC
=
16V
RL
=
8Ω
f
=
1kHz
Voltage gain, VG -- dB
External feedback resistor, RNF -- Ω
5
7
0.1
10
100
3
2
5
7
1.0
3
2
5
7
3
2
23 57 1k
23 57 10k
23 57 100k
23 57
THD -- f
VCC
=
16V
RL
=
8Ω
PO
=
0.5W
VG
=
50dB
45dB
40dB
35dB
Frequency, f -- Hz
Total harmonic distortion, THD -- %
VCC
=
16V
RL
=
8Ω
BPF
=
20Hz to 20kHz
5
7
0.1
3
5
7
1.0
3
2
10 20 30 40 6050
VNO -- VG
Rg
=
10kΩ
0
FILTER OUT
FILTER IN
Output noise voltage, VNO -- mV
Voltage gain, VG -- dB
10
20
30
40
50
60
00-10-20-30 10 20 30 40 50 80 9060 70
ICCO -- Ta
VCC
=
25V
22V
14V 16V
Quiescent current, ICCO -- mA
Quiescent
Ambient temperature, Ta -- °C
VCCR
=
0.5V
0.3V
VCC
=
16V
RL
=
8Ω
fr
=
100Hz
Rg
=
0
3
5
7
1.0
2
3
5
2
10 20 30 40 6050
VRO -- VG
Voltage gain, VG -- dB
Output ripple voltage, VRO -- mV
LA4265
No.1463-8/9
0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
46
47
48
49
50
1.0
0-10-20-30 10 20 30 40 50 8060 70
THD,VG -- Ta
VCC
=
16V
THD
VG
RL
=
8Ω
f
=
1kHz
f = 1kHz clip waveform
(VCC = 16V, RL = 8Ω, THD = 5%)
f = 10kHz clip waveform
(VCC = 16V, RL = 8Ω, THD = 5%)
0
1
2
3
4
5
6
01020304050 809060 70
PO -- Ta
VCC
=
16V
THD
=
10%
5%
RL
=
8Ω
f
=
1kHz
-10-20-30
Ambient temperature, Ta -- °C
Output power, VO -- W
Ambient temperature, Ta -- °C
Total harmonic distortion, THD -- %
Voltage gain, VG -- dB
Pop noise waveform at the time of power switch
0
2
4
6
8
−1
0
1
off
V/div
OFF (VCC = 16V, RL = 8Ω, quiescent)
S/div
Middle point fall waveform
Pop noise waveform
Pop noise waveform at the time of power switch
0
2
4
6
8
−1
0
1
on
V/div
ON (VCC = 16V, RL = 8Ω, quiescent)
S/div
Pop noise waveform
Middle point rise waveform
Proper Cares in Using IC
• Maximum ratings
If the IC i s used in t he vicinit y of the m aximum rati ngs, even a sl ight variat ion in con ditions m ay cause the maxim um
ratings to be exceeded, thereby leading to breakdown. Allow an ample margin of variation for supply voltage, etc.
and use the IC in the range where the maximum ratings are not exceeded.
• Pin-to-pin short
If power is applied when the space between pins is shorted, breakdown or deterioration may occur. When mounting
the IC on the board or applying power, make sure that the space between pins is not shorted with solder, etc.
• When used in radio applica t i ons
When using in radios, allow a sufficient space between IC and bar antenna.
LA4265
PS No.1463-9/9
SANYO Semiconductor Co.,Ltd. assumes no responsibility for equipment failures that result from using
products at values that exceed, even momentarily, rated values (such as maximum ratings, operating condition
ranges, or other parameters) listed in products specifications of any and all SANYO Semiconductor Co.,Ltd.
products described or contained herein.
SANYO Semiconductor Co.,Ltd. strives to supply high-quality high-reliability products, however, any and all
semiconductor products fail or malfunction with some probability. It is possible that these probabilistic failures or
malfunction could give rise to accidents or events that could endanger human lives, trouble that could give rise
to smoke or fire, or accidents that could cause damage to other property. When designing equipment, adopt
safety measures so that these kinds of accidents or events cannot occur. Such measures include but are not
limited to protective circuits and error prevention circuits for safe design, redundant design, and structural
design.
Upon using the technical information or products described herein, neither warranty nor license shall be granted
with regard to intellectual property rights or any other rights of SANYO Semiconductor Co.,Ltd. or any third
party. SANYO Semiconductor Co.,Ltd. shall not be liable for any claim or suits with regard to a third party's
intellctual property rights which has resulted from the use of the technical information and products mentioned
above.
Information (including circuit diagrams and circuit parameters) herein is for example only; it is not guaranteed
for volume production.
Any and all information described or contained herein are subject to change without notice due to
product/technology improvement, etc. When designing equipment, refer to the "Delivery Specification" for the
SANYO Semiconductor Co.,Ltd. product that you intend to use.
In the event that any or all SANYO Semiconductor Co.,Ltd. products described or contained herein are
controlled under any of applicable local export control laws and regulations, such products may require the
export license from the authorities concerned in accordance with the above law.
No part of this publication may be reproduced or transmitted in any form or by any means, electronic or
mechanical, including photocopying and recording, or any information storage or retrieval system, or otherwise,
without the prior written consent of SANYO Semiconductor Co.,Ltd.
• Printed circuit pattern
When designing the printed circuit pattern, make the power supply, output, and ground lines thick and short and
arrange the pat tern and parts so that no fee dback loop is formed bet ween input and out put. Place power capacitor C5,
oscillation blocking capacitor C3 as close to IC pins as possible to prevent oscillation from occurring. Refer to the
sample printed circuit pattern.
• Some plug jacks to be used fo r co n nect i ng t o the ext ernal speaker ca n have the both poles short-ci rcui ted once whe n
connecting. In this case, the load is short-circuited, which may break down the IC.
This catalog provides information as of August, 2008. Specifications and information herein are subject
to change without notice.
