LM1896 datasheet(5/10 Pages) NSC

5 / 10 page

Typical Applications (Continued)

TLH7920 – 7

6 9 No connection on LM1896

( ) Indicates pin number for LM2896

TLH7920 – 8

FIGURE 2 Stereo Amplifier with AV e 200 BW e 30 kHz

External Components (Figure 2)

Components

Comments

1 R2 R5 R10 R13

Sets voltage gain AV e 1 a R5R2 for one channel and AV e 1 a R10R13

for the other channel

2 R3 R12

Bootstrap resistor sets drive current for output stage and allows pins 3 and 12 to

go above VS

3 Ro

Works with Co to stabilize output stage

4 C1 C14

Input coupling capacitor Pins 1 and 14 are at a DC potential of VS 2 Low

frequency pole set by

fL e

2q RIN C1

5 C2 C13

Feedback capacitors Ensure unity gain at DC Also a low frequency pole at

fL e

2qR2C2

6 C3 C12

Bootstrap capacitors used to increase drive to output stage A low frequency

pole is set by

fL e

2qR3C3

7 C5 C10

Compensation capacitor These stabilize the amplifiers and adjust their

bandwidth See curve of bandwidth vs allowable gain

8 C7

Improves power supply rejection (See Typical Performance Curves) Increasing

C7 increases turn-on delay

9 Cc

Output coupling capacitor Isolates pins 5 and 10 from the load Low frequency

pole set by

fL e

2q CcRL

10 Co

Works with Ro to stabilize output stage

11 CS

Provides power supply filtering

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