Sanyo LA4635A Specifications

Ordering number: ENN6983

SANYO Electric Co.,Ltd. Semiconductor Company

TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110-8534 JAPAN

Monolithic Linear IC

LA4635A

For General Audio Use

2-Channel BTL AF Power Amplifier

Overview

The LA4635A is a 2-channel power IC that is pin-compat­ible 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 VCC = 9 V and
VCC = 12 V specifications and is available in two versions

Package Dimensions

unit: mm

3049B-SIP12H

[LA4635A]

26.8

(20.0)

with different voltage gains (LA4635A with VG = 35 dB
and LA4635B with VG = 45 dB).

(8.4)

(2.4)

7.0

2.0

0.5

1.0

(11.8)

(R1.7)

121

SANYO: SIP12H

1.0min

13.2max

6.0

0.4

2.0

Specifications

Maximum Ratings at Ta = 25°C

Parameter Symbol Conditions Ratings Unit
Maximum supply voltage V
Maximum output current Io 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

max No signal 24 V

CC

4.0

Operating Conditions at Ta = 25°C

Parameter Symbol Conditions Ratings Unit
Recommended supply voltage V
Recommended load resistance RL op 3 to 8 Ω
Allowable operating voltage range VCC op 5.5 to 22 V

CC

12 V

* Set VCC, RL, and output level such that Pd max. is not exceeded for the size of heat sink used.

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.

70102RM (II) No. 6983-1/3

LA4635A

Operating Characteristics at Ta = 25°C, VCC = 12 V, RL = 3 Ω, f = 1 kHz, Rg = 600 Ω

Parameter Symbol Conditions Ratings

min typ max Unit

Quiescent current I

CCO

Rg = 0 18 35 80 mA
Standby current Ist 110µA
Voltage gain VG VO = 0 dBm 33 35 37 dB
Total harmonic distortion THD PO = 1 W 0.15 0.4 %
Output power PO1 THD = 10% 3.0 4.5 W

PO2VCC = 9 V, THD = 10% 2.0 2.5 W

Output noise voltage V

NO

Rg = 0, BPF = 20 Hz to 20 kHz 0.05 0.25 mV
Ripple rejection SVRR Rg = 0, fR = 100 Hz, VR = 0 dBm 50 60 dB
Channel separation CH Sep Rg = 10 kΩ, VO = 0 dBm 55 65 dB
Input resistance Ri 20 30 40 kΩ
Standby pin voltage V

ST

Amplifier on (pin 5 voltage) 1.5 5.0 V

Sample Application Circuit

LA4635A

(Popping Noise

RX

4.7µF

5V

Eliminator)

P.P

+

16V

25V

1000µF

CC

1000µF

+

V

CC

(Ripple Filter)

DC

1 2 3 4 5 6 7 10 11 128 9

+

1µF

16V

100µF

IN1

50V

PRE

IN2

GND

+

+

1µF

50V

OUT2 NC NCSTBY V

16V

L

R

+

PWR

GND

1000µF

OUT1

16V

L

R

Top view

+

applied to the Standby
pin (pin 5), a resistor
(Rx) should be
inserted to limit the
inflow current, as

* If voltage is to be

ILA00778

required. Please refer
to the information
below.

(Reference) Pin 5 Equivalent Circuit Inside IC

STBY

R1

2kΩ

AI heat sink
Mounting
torque 39N•cm
Flat washer
Silicone grease
applied

R2
2kΩ

ILA00779

qjc=3°C / W

ILA00777

IxRx

Standby

Pin Voltage

Allowable power dissipation, Pd max – W

+

Vx

30

25

20

15

100 ¥ 100 ¥ 1.5 mm

12.5
10

50 ¥ 50 ¥ 1.5 mm

7
5

Single IC

3.2

0

--20 0 12080 100 14020 40 60 160

Ix=max 4.5mA

Infinite heat sink

Ambient temperature, Ta – °C

5

Pd max -- Ta

3

3

• 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 µA to pin 5 turns on the amplifier. (If 5 V is applied
directly to pin 5 the inflow current of pin 5 is approxi­mately 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 measure­ment.

Rx = (Vx / Ix) – R1 (2 kΩ)

Note: The LA4635A is basically pin-compatible with the

LA4636, but there are partial differences in
operation and usage, including with regard to
externally connected parts.

No. 6983-2/3