Ordering number: ENN6984
SANYO Electric Co.,Ltd. Semiconductor Company
TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110-8534 JAPAN
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.
For General Audio Use
2-Channel BTL AF Power Amplifier
LA4635B
Monolithic Linear IC
70102RM (II) No. 6984-1/3
Package Dimensions
unit: mm
3049B-SIP12H
[LA4635B]
SANYO: SIP12H
Overview
The LA4635B is a 2-channel power IC that is pin-compat-
ible with the LA4636.
It represents a new concept in devices of this type by
allowing design editing based on common circuit board pin
compatibility for products of different power ranks. It is
compatible with V
CC
= 9 V and V
CC
= 12 V specifications
and is available in two versions with different voltage
gains (LA4635B with VG = 45 dB and LA4635A with VG
= 35 dB).
26.8
(20.0)
(R1.7)
(8.4)
12
1
(11.8)
0.5
2.0
4.0
0.4
2.0
7.0
(2.4)
1.0
13.2max
6.0
1.0min
Maximum Ratings
at Ta = 25
C
Parameter
Symbol
Conditions
Ratings
Unit
Maximum supply voltage
V
CC
max
No signal
24
V
Maximum output current
I
o
peak
Per channel
2.5
A
Allowable power dissipation
Pd max
Infinite heat sink
25
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
V
CC
12
V
Recommended load resistance
R
L
op
3 to 8
Allowable operating voltage range
V
CC
op
5.5 to 22
V
* Set V
CC
, R
L
, and output level such that Pd max. is not exceeded for the size of heat sink used.
Specifications
LA4635B
No. 6984-2/3
Circuit Application Example
+
100
F
16V
DC
+
1
F
50V
IN1
+
1
F
50V
IN2
+
4.7
F
16V
1000
F
25V
P.P
PWR
GND
+
1000
F
16V
OUT2
NC
NC
STBY
VCC
VCC
R
L
PRE
GND
Rx
5V
+
+
1000
F
16V
OUT1
R
L
LA4635B
1
2
3
4
5
6
7
10
11
12
8
9
ILA00780
Top view
(Ripple Filter)
(Popping Noise
Eliminator)
Operating Characteristics
at Ta = 25
C, V
CC
= 12 V, R
L
= 3
, f = 1 kHz, Rg = 600
Parameter
Symbol
Conditions
Ratings
min
typ
max
Unit
Quiescent current
I
CCO
Rg = 0
18
35
80
mA
Standby current
Ist
1
10
A
Voltage gain
VG
V
O
= 0 dBm
43
45
47
dB
Total harmonic distortion
THD
P
O
= 1 W
0.25
0.8
%
Output power
P
O
1
THD = 10%
3.0
4.5
W
P
O
2
V
CC
= 9 V, THD = 10%
2.0
2.5
W
Output noise voltage
V
NO
Rg = 0, BPF = 20 Hz to 20 kHz
0.15
0.5
mV
Ripple rejection
SVRR
Rg = 0, f
R
= 100 Hz, V
R
= 0 dBm
45
55
dB
Channel separation
CH Sep
Rg = 10 k
, V
O
= 0 dBm
45
55
dB
Input resistance
Ri
20
30
40
k
Standby pin voltage
V
ST
Amplifier on (pin 5 voltage)
1.5
5.0
V
* If voltage is to be
applied to the Standby
pin (pin 5), a resistor
(Rx) should be
inserted to limit the
inflow current, as
required. Please refer
to the information
below.
The amplifier can be turned on and off by controlling
the level (high/low) of pin 5.
Applying a signal equal or greater than 1.5 V and
800
A to pin 5 turns on the amplifier. (If 5 V is applied
directly to pin 5 the inflow current of pin 5 is approxi-
mately 4.5 mA.)
If a voltage, Vx, exceeding 5 V is to be applied, current
limiting resistor (Rx) should be inserted to limit the
inflow current to 4.5 mA. (See following equation.)
Rx = (Vx 5 V) / 4.5 mA
If pin 5 is to be controlled by the microprocessor, the
pin 5 inflow current (Ix) should be optimized for the
capacity of the microprocessor by calculating Rx using
the following equation, as a general guideline, and then
confirming the inflow current through actual measure-
ment.
Rx = (Vx / Ix) R1 (2 k
)
Note: The LA4635B is basically pin-compatible with the
LA4636, but there are partial differences in
operation and usage, including with regard to
externally connected parts.
+
Ix
Rx
Ix=max 4.5mA
STBY
R2
2k
R1
2k
ILA00781
5
Standby
Pin Voltage
Vx
(Reference) Pin 5 Equivalent Circuit Inside IC
--20
0
120
80
100
140
20
40
60
160
0
5
10
15
3.2
7
12.5
25
20
30
ILA00777
Pd max -- Ta
qjc=3
C / W
Allo
w
a
b
le po
w
er dissipation, Pd max
W
Infinite heat sink
A I h e a t s i n k
M o u n t i n g
t o r q u e 3 9 N c m
F l a t wa s h e r
S i l i c o n e gr e a s e
a p p l i e d
100 100 1.5 mm
3
50 50 1.5 mm
3
Ambient temperature, Ta
C
Single IC
LA4635B
PS No. 6984-3/3
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.
This catalog provides information as of July, 2002. Specifications and information herein are subject to
change without notice.
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