Page 1
Ordering number : ENN6631
92900RM (OT) No. 6631-1/8
Overview
The LA4625 is a 2-channel general-purpose BTL audio
power amplifier provided in a miniature package. It was
designed for the best possible audio quality and features
an extended low band roll-off frequency provided by a
newly-developed NF circuit that does not require an
external capacitor. Furthermore, crosstalk, which can
cause muddiness in the audio output, has been
significantly reduced by both circuit and wiring pattern
improvements. Thus this amplifier can provide powerful
lows and clear highs.
Note that this device is pin compatible with the 20 W × 2-
channel LA4628, and allows end products differentiated
by their power rating to share the same printed circuit
board.
Features
• Total output: 13.5 W + 13.5 W (at VCC= 12 V, RL = 4 Ω,
THD = 10%)
• PMPO reference data: 115 W × 2 (VCC= 20 V, RL = 4 Ω)
• High-fidelity design (fL< 10 Hz, fH= 130 kHz)
• Extremely low impulse noise levels
• An arbitrary amplifier startup time can be set up with
external components.
• Full complement of built-in protection circuits (includes
circuits that protect against shorting to VCC, shorting to
ground, load shorting, overvoltages and excessive
temperatures)
Package Dimensions
unit: mm
3113A-SIP14HZ
27.0
20.0
R1.7
0.5
1.94
8.4
7.8
14.5max
14
1
0.4
11.8
5.2
4.6
1.6
2.2
4.0
1.78 3.56
3.56
SANYO: SIP14HZ
[LA4625]
LA4625
SANYO Electric Co.,Ltd. Semiconductor Company
TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110-8534 JAPAN
Two-Channel 13.5 W BTL Audio Power Amplifier
Monolithic Linear IC
Any and all SANYO products described or contained herein do not have specifications that can handle
applications that require extremely high levels of reliability, such as life-support systems, aircraft’s
control systems, or other applications whose failure can be reasonably expected to result in serious
physical and/or material damage. Consult with your SANYO representative nearest you before using
any SANYO products described or contained herein in such applications.
SANYO 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 products described or contained
herein.
Page 2
No. 6631-2/8
LA4625
Parameter Symbol Conditions Ratings Unit
Maximum supply voltage V
CC
max No signal 24 V
Maximum output current I
O
peak Per channel 3.5 A
Allowable power dissipation Pd max With an arbitrarily large heat sink 32.5 W
Operating temperature Topr –20 to +85 °C
Storage temperature Tstg –40 to +150 °C
Specifications
Maximum Ratings at Ta = 25°C
Parameter Symbol Conditions Ratings Unit
Recommended supply voltage V
CC
12 V
Recommended load resistance range RL op 4 to 8 Ω
Allowable operating supply voltage range V
CC
op 7.2 to 20 V
Operating Conditions at Ta = 25°C
Note: With VCC, RL, and the output level in ranges such that the Pdmax for the heat sink used is not exceeded.
Pd max — Ta
Ambient temperature, Ta —°C
10
15
0
–20 0 20 40 1601401201008060
5
20
25
30
35
Allowable power dissipation, Pd max — W
θjc=2.0°C/W
θf=3°C/W
θf=4°C/W
θf=7°C/W
θf=10°C/W
No Fin
Parameter Symbol Conditions
Ratings
Unit
min typ max
Quiescent current I
CCO
Rg = 0 65 120 240 mA
Standby mode current drain I
st
Standby mode (amplifier off), with no power supply capacitor.
10 60 µA
Voltage gain V
G
VO= 0 dBm 38 40 42 dB
Total harmonic distortion THD P
O
= 1 W, Filter = FLAT 0.06 0.2 %
Output power P
O
1 THD = 10% 10 13.5 W
Output offset voltage V
N
offset Rg = 0 –300 +300 mV
Output noise voltage V
NO
Rg = 0, BPF = 20 Hz to 20 kHz 0.1 0.5 mV
Ripple rejection ratio SVRR Rg = 0, VR = 0 dBm, fR = 100 Hz 40 50 dB
Channel separation CH Sep Rg = 10 kΩ, V
O
= 0 dBm 50 60 dB
Input resistance Ri 21 30 39 kΩ
Standby pin applied voltage V
ST
Amplifier on (applied through an external 10 kΩ resistor) 2.5 V
CC
V
Operating Characteristics at Ta = 25°C, VCC= 12 V, RL = 4 Ω, f = 1 kHz, Rg = 600 Ω
Page 3
Equivalent Circuit Block Diagram
No. 6631-3/8
LA4625
C8 0.1 µ
R4
2.2
C9 0.1 µ
R5
2.2
RL
4 Ω
–OUT2
+OUT2
–
+
Standby
SW
OFF
RIPPLE
FILTER
+
BIAS
CIRCUIT
STANDBY
SW
POP NOISE
PREVENTION
CIRCUIT
PREDRIVER
PREDRIVER
POWER
POWER
LOAD SHORT
PROTECTOR
OUTPUT PIN TO V
CC
SHORT PROTECTOR
OUTPUT PIN TO V
CC
SHORT PROTECTOR
OUTPUT PIN TO GND
SHORT PROTECTOR
OUTPUT PIN TO GND
SHORT PROTECTOR
PREDRIVER
PREDRIVER
POWER
POWER
OVER VOLTAGE/
SURGE
THERMAL
SHUT DOWN
LOAD SHORT
PROTECTOR
V
CC
+
+
ON
R1
10 K
+5 V
C4
2.2 µ
10 V
33 µ
10 V
0.47 µ
10 V
2.2 µ
10 V
C1
100 µ/16 V
V
CC
C5
2200 µ
25 V
+
**
**
C6 0.1 µ
R2
2.2
C7 0.1 µ
R3
2.2
RL
4 Ω
–OUT1
+OUT1
–
+
**
**
POWER
GND2
+ +
C3
C10
**
(POLYESTER
FILM
CAPACITOR)
+
–
IN
+
–
IN
C2
PRE GND
IN2
C3 C10
Sets the amplifier starting time
(Approximately 0.6 seconds when 33 µF)
Impulse noise reduction
(Note: The device’s ability to withstand shorting
to V
CC
or shorting to ground when VCC is around
16 V may be reduced as the value of this
capacitor is increased. We recommend 0.47 µF.)
POWER
GND1
14
2
1
3
4
6
7
5
8
10
9
11
12
13
Page 4
Pin Voltages
External Components
C1 and C4: Input capacitors. A value of 2.2 µF is recommended. Determine the polarity based on the DC potential of the
circuit connected directly to the LA4625 front end. Note that the low band response can be adjusted by
varying fLwith the capacitors C1 and C4.
C2: Decoupling capacitor (ripple filter)
C3: Sets the amplifier starting time, which will be approximately 0.6 seconds for a value of 33 µF. The starting
time is proportional to the value of this capacitor, and can be set to any desired value.
C5: Power-supply capacitor
C6, C7, C8, and C9:
Oscillation prevention capacitors. Use polyester film capacitors (Mylar capacitors) with excellent
characteristics. (Note that the series resistors R2, R3, R4, and R5 are used in conjunction with these
capacitors to achieve stable amplifier operation.) A value of 0.1 µF is recommended.
C10: Impulse noise reduction capacitor. A value of 0.47 µF is recommended. Caution is required when selecting
the value for this capacitor, since increasing its value influences the operation of the circuits that protect
against shorting the amplifier output pins to VCCor to ground when higher VCCvoltages (approximately
16 V or higher) are used.
R1: Standby switch current limiting resistor. A value of 10 kΩ is recommended when a voltage in the range 2.5
to 12 V will be applied as the standby switching voltage. Note that this resistor is not optional: it must be
included.
IC Internal Characteristics and Notes
1. Standby function
• Pin 4 is the standby switch. A voltage of 2.5 V or
higher must be applied through an external resistor to
turn the amplifier on.
• If a voltage of over 12 V will be applied as the
standby mode switching voltage, use the following
formula to determine the value of R1so that the
current entering at pin 4 remains under 500 µA.
<applied voltage> – 1.4
R1= —————————— – 10 kΩ
500 µA
2. Muting function
• Pin 5 connects the capacitor that determines the starting time to prevent impulse noise. It can also be used to mute
the amplifier output by shorting pin 5 to ground. When this function is used, the recovery time depends on C3.
No. 6631-4/8
LA4625
VCC= 12 V, with 5 V applied to STBY through a 10 kΩ resistor, RL = 4 Ω, Rg = 0
Pin No. 1 2 3 4 5 6 7
Pin IN1 DC PRE–GND STBY ON TIME IN2 POP
Pin voltage 1.46 V 5.18 V 0 V 3.21 V 2.26 V 1.46 V 2.05 V
Pin No. 8 9 10 11 12 13 14
Pin +OUT2 –OUT2 PWR–GND2 +OUT1 PWR–GND1 –OUT1 V
CC
Pin voltage 5.21 V 5.21 V 0 V 5.21 V 0 V 5.21 V 12 V
500 µA or lower
10 kΩ
4
R1
Applied standby
voltage
About 1.4 V
)
(2 V
BE
Pin 4 Internal Equivalent Circuit
Page 5
No. 6631-5/8
LA4625
3. Impulse noise improvements
• While the LA4625 achieves a low level of impulse noise, if even further reductions in impulse noise at power on/off
(and when switching into or out of standby mode) a 0.47 µF capacitor may be inserted between pin 7 and the PRE
GND pin (pin 3). (Pin 7 is the output amplifier bias pin. Since the ability to withstand shorting the output pins to
VCCor ground is reduced for supply voltages over 16 V if the pin 7 capacitance is large, we recommend a value of
0.47 µF or lower for this capacitor.)
4. Protection circuits
• Due to the system structure of the protection circuit for shorts to VCCor ground, if there is a DC resistance between
the amplifier output pins and ground, the protection circuit may operate when power is first applied and the
amplifier may fail to turn on. The basic design approach we recommend is not to adopt any designs in which there is
a DC resistance between the amplifier outputs and ground.
• The LA4625 includes a built-in thermal protection circuit to prevent the IC from being damaged or destroyed if
abnormally high temperatures occur. This thermal protection circuit gradually reduces the output if the IC junction
temperature (Tj) reaches the range 170 to 180°C due to inadequate heat sinking or other problem. If the temperature
falls, the amplifier will restart automatically.
• The LA4625 also includes other protection circuits. Use of these circuits also requires care during end product
design and testing.
5. Other notes
• The LA4625 is a BTL power amplifier. When testing this device, the ground systems for the test equipment
connected to IC inputs, and that for the test equipment connected to IC outputs, must be isolated. Do not use a
common ground.
Printed Circuit Pattern
+
+
+
R2
R1
C5
GND
V
CC
C2
C1
1
LA4625
14
C6
R3 C7
ILA00349
GND
GND
+OUT1
R5 C9
+OUT2
R4 C8
--OUT2
--OUT1
IN1
+
C4
+
C3
+
C10
IN2
STB
(copper foil side)
Page 6
No. 6631-6/8
LA4625
60
0
10
20
30
40
50
6 1097 8 1211 14 1513 16 1817
PO — V
CC
f Response
ILA00354
ILA00357
24
20
16
12
8
4
0
1.0
32 5 7
10
32 5 7
100 1k
32 5 7
32
10 100 1k 10k 100k
5 7 32 5 7 32 5 7 32 5 7
10
2 3 5 7
100
2 3 5 71k2 3 5 7
10k 100k
2 3 5 7
ILA00356
PO — f
2
3
5
7
0.01
0.1
2
3
5
7
1.0
2
3
5
7
10
2
3
5
7
100
2
0
--2
--6
--4
--8
--10
PO — V
IN
ILA00355
0.01
2
3
5
7
0.1
2
3
5
7
1.0
10
2
3
5
7
THD — f
ILA00359
100k10
2 3 5 7 2 3 5 7 2 3 5 7 2 3 5 7
100 1k 10k
10
7
5
3
2
1.0
7
5
3
2
0.1
7
5
3
2
0.01
THD — P
O
ILA00358
0.1
2 3 5 7
1.0
2 3 5 7
10 100
2 3 5 7
3
2
5
7
0.01
3
2
5
7
0.1
1.0
VNO — Rg
ILA00361
100k100
2 3 5 7 2 3 5 7 2 3 5 7
1k 10k
0
10
20
30
40
50
60
70
80
90
CH sep. — f
ILA00360
100k10
2 3 5 7 2 3 5 7 2 3 5 7 2 3 5 7
100 1k 10k
THD = 30 %
10 %
f = 1 kHz
Rg = 600 Ω
R
L
= 4 Ω
V
CC
= 12 V
R
L
= 4 Ω
f = 1 kHz
THD = 10 %
10 kHz
100 kHz
CH1 → 2
CH2 → 1
1 kHz
THD = 3 %
THD = 1 %
V
CC
= 12 V
R
L
= 4 Ω
Rg = 600 Ω
V
CC
= 12 V
R
L
= 4 Ω
Rg = 600 Ω
V
O
= 0 dBm at f = 1 kHz
V
CC
= 12 V
R
L
= 4 Ω
Rg = 600 Ω
V
CC
= 12 V
R
L
= 4 Ω
V
CC
= 12 V
R
L
= 4 Ω
P
O
= 1 W
V
CC
= 12 V
R
L
= 4 Ω
Rg = 10 kΩ
V
O
= 0 dBm
Supply voltage, VCC— V
Output power, P
O
— W
Output power, P
O
— W
Output power, P
O
— W
Response — dB
Total harmonic distortion, THD — %
Total harmonic distortion, THD — %
Channel separation, CHsep — dB
Output noise voltage, V
NO
— mVrms
Input voltage, VIN— mVrms
Frequency, f — Hz Frequency, f — Hz
Output power, P
O
— W
Frequency, f — Hz
Frequency, f — Hz
Signal source resistance, Rg — Ω
Page 7
No. 6631-7/8
LA4625
0
--20
--40
--60
--80
--100
--120
4 876 1210 1614 2018 22
SVRR — V
CC
I
CCO
— V
CC
ILA00362
ILA00365
0
--20
--40
--60
--80
--100
0 0.80.60.40.2 1.0 1.41.2 1.6 2.01.8
10
3 5 72
100
3 5 72
1k
3 5 72
10k 100k
3 5 72
0 1284 16 2420 28 3632
ILA00364
SVRR — f
R
0
--20
--60
--40
--80
--100
180
120
140
160
80
60
100
20
40
0
SVRR — V
CCR
ILA00363
3
5
7
2
1.0
3
5
7
2
10
100
3
5
7
2
0.1
3
5
7
2
1.0
10
Pd, ICC — P
O
ILA00367
0.1
2 3 5 7
1.0
2 3 5 7
10 100
2 3 5 7
12
10
8
6
4
2
0
VN — V
CC
ILA00366
35300 5 10 15 20 25
1.0
0.8
0.6
0.4
0.2
0
Amp ON time
ILA00368
1.0
2 3 5 7
10 100
2 3 5 7
Rg = 0
f
R
= 100 Hz
V
CCR
= 0 dBm
OUT2
OUT1
OUT2
OUT1
100 Hz OUT1
3 kHz OUT2
3 kHz OUT1
100 Hz OUT2
V
CC
= 15 V
V
CC
= 12 V
I
CC
V
CC
= 12 V
R
L
= 4 Ω
RL = Open
Rg = 0
V
CC
= 12 V
V
ST
= 5 V
RL = 4 Ω
Rg = 0
V
CC
= 12 V
R
L
= 4 Ω
Rg = 0
V
CCR
= 0 dBm
RL = 4 Ω
Rg = 600 Ω
f = 1 kHz
SVRR = 20 log
VO
V
CCR
Ripple rejection ratio, SVRR — dB
Supply voltage, VCC— V
Ripple rejection ratio, SVRR — dB
Ripple rejection ratio, SVRR — dB
Quiescent current, I
CCO
— mA
V
N
— V
Power dissipation, Pd — W
Amp ON time — s
Power supply ripple, V
CCR
— Vrms
Ripple frequency, f
R
— Hz
Supply voltage, V
CC
— V
Supply voltage, VCC— V
Output power, P
O
— W/ch
C3 — µF
Page 8
PS No. 6631-8/8
LA4625
This catalog provides information as of September, 2000. Specifications and information herein are
subject to change without notice.
Specifications of any and all SANYO 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’s products or equipment.
SANYO Electric Co., Ltd. strives to supply high-quality high-reliability products. However, any and all
semiconductor products fail with some probability. It is possible that these probabilistic failures could
give rise to accidents or events that could endanger human lives, that could give rise to smoke or fire,
or 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.
In the event that any or all SANYO products (including technical data, services) described or contained
herein are controlled under any of applicable local export control laws and regulations, such products must
not be exported without obtaining 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 permission of SANYO Electric Co., Ltd.
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 product that you intend to use.
Information (including circuit diagrams and circuit parameters) herein is for example only; it is not
guaranteed for volume production. SANYO believes information herein is accurate and reliable, but
no guarantees are made or implied regarding its use or any infringements of intellectual property rights
or other rights of third parties.
Loading...