AN5278 Просмотр технического описания (PDF) - Panasonic Corporation

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производитель

AN5278

4.8 W ×1 (18 V, 8 Ω) Power Amplifier with Volume and Tone Control

Panasonic Corporation 

AN5278

ICs for Audio Common Use

s Technical Information (continued)

2.Application Note

1) Gain setting and frequency response

The gain is fixed to be 30 dB by internal resistors. The frequency response is flat for the values of R1 = 6.2 kΩ, and

C2 = 0.01 µF, between pins 1 and 2 (other conditions : tone control voltage is set at 2.5 V, and volume control voltage

is set at 5 V).

Gain

30 dB

10 µF 6.2 kΩ

VIN

R1

C2

0.01 µF

Frequency

The gain can be reduced by inserting a resistor Rf in series with the electrolytic capacitor at Pin6.

Voltage gain = 20 log [10 kΩ/(Rf + 300 Ω)]

300 Ω 10 kΩ

Rf

10 µF

RL = 8 Ω

Bass boost can be easily implemented by inserting a series connection of RC between Pin8 (output) and Pin6 (NF).

Example : Rb = 12 kΩ, Cb = 0.022 µF

300 Ω 10 kΩ

Rf Cb Rb

RL = 8 Ω

6

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