LA4635B

No. 6984-2/3

Circuit Application Example

+

DC

+

IN1

+

IN2

+

P.P

PWR

GND

+

OUT2

NC

NC

STBY

VCC

VCC

PRE

GND

+

+

OUT1

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

Parameter

Symbol

Conditions

Ratings

min

typ

max

Unit

Quiescent current

Rg = 0

18

35

80

mA

Standby current

Ist

110

µA

Voltage gain

VG

43

45

47

dB

Total harmonic distortion

THD

0.25

0.8

%

Output power

THD = 10%

3.0

4.5

W

2.0

2.5

W

Output noise voltage

Rg = 0, BPF = 20 Hz to 20 kHz

0.15

0.5

mV

Ripple rejection

SVRR

45

55

dB

Channel separation

CH Sep

Rg = 10 k

45

55

dB

Input resistance

Ri

20

30

40

k

Ω

Standby pin voltage

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

µA 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

Ω)

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

Ω

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

Infinite heat sink

AI heat sink

Mounting

torque 39N • cm

Flat washer

Silicone gr ease

applied

Ambient temperature, Ta –

°C

Single IC