SANYO LA4635B Datasheet
Ordering number: ENN6984
SANYO Electric Co.,Ltd. Semiconductor Company
TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110-8534 JAPAN
Monolithic Linear IC
LA4635B
For General Audio Use
2-Channel BTL AF Power Amplifier
Overview
The LA4635B 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
Package Dimensions
unit: mm
3049B-SIP12H
[LA4635B]
26.8
(20.0)
and is available in two versions with different voltage
gains (LA4635B with VG = 45 dB and LA4635A with VG
= 35 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. 6984-1/3
LA4635B
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 43 45 47 dB
Total harmonic distortion THD PO = 1 W 0.25 0.8 %
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 0.15 0.5 mV
Ripple rejection SVRR Rg = 0, fR = 100 Hz, VR = 0 dBm 45 55 dB
Channel separation CH Sep Rg = 10 kΩ, VO = 0 dBm 45 55 dB
Input resistance Ri 20 30 40 kΩ
Standby pin voltage V
ST
Amplifier on (pin 5 voltage) 1.5 5.0 V
Circuit Application Example
LA4635B
(Ripple Filter)
DC
1 2 3 4 5 6 7 10 11 128 9
+
1µF
16V
100µF
IN1
50V
PRE
IN2
GND
+
+
1µF
50V
(Popping Noise
Rx
5V
Eliminator)
P.P
+
16V
4.7µF
25V
1000µF
CC
OUT2 NC NCSTBY V
PWR
GND
OUT1
Top view
* If voltage is to be
applied to the Standby
+
16V
1000µF
L
R
+
16V
1000µF
L
R
pin (pin 5), a resistor
(Rx) should be
inserted to limit the
inflow current, as
+
V
CC
ILA00780
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
ILA00781
qjc=3°C / W
ILA00777
IxRx
Standby
Pin Voltage
12.5
Allowable power dissipation, Pd max – W
+
Vx
30
25
20
15
100 ¥ 100 ¥ 1.5 mm
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
Pd max -- Ta
Infinite heat sink
Ambient temperature, Ta – °C
5
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 LA4635B is basically pin-compatible with the
LA4636, but there are partial differences in
operation and usage, including with regard to
externally connected parts.
No. 6984-2/3
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