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18W Hi-Fi AMPLIFIER AND 35W DRIVER

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LINEAR INTEGRATED CIRCUIT

APPLICATION SUGGESTION

The recommended values of the components are those shown on application circuit of Fig.14. Different values can

be used.The following table can help the designer.

Component

R1

R2

R3

R4

R5

C1

C2

C3,C4

C5,C6

C7

C8

D1,D2

Recommended value

Purpose

Large than

Large than

recommended value recommended value

22KΩ

Closed loop gaon

setting.

Increase of Gain

Decrease of Gain

680Ω

Closed loop gaon

Decrease of Gain

Increase of Gain

setting.

22KΩ

Non inverting input Increase of input

Decrease of input

biasing

impedance

impedance

1Ω

Frequency stacility Danger of oscillation

at high frequencies

with inductive loads.

≈3R2

Upper frequency Poor high frequencies Dange of oscillation

cutoff

attenuation

1µF

Input DC decoupling

Increase of low

frequencies cutoff

22µF

Inverting DC

decoupling

Increase of low

frequencies cutoff

0.1µF

Supply voltage

Dange of oscillation

bypass

100µF

Supply voltage

Dange of oscillation

bypass

0.22µF

Frequency stability

Larger bandwidth

≈1/(2π*B*R1)

Upper frequency smaller bandwidth Larger bandwidth

cutoff

1N4001

To protect the device

against output voltage

spikes.

YOUWANG ELECTRONICS CO.LTD

14

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