PT2305 데이터 시트보기 (PDF) - Princeton Technology

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PT2305

2.5W × 2 Class AB Audio Power Amplifier

Princeton Technology 

Tel: 886-2-66296288

Fax: 886-2-29174598

URL: http://www.princeton.com.tw

2.5W × 2 Class AB Audio Power Amplifier

PT2305

POP AND CLICK SURPPRESS

A power amplifier uses single supply voltage may almost have noise on output in the power-on period.

It is because of the output DC potential needs time to stable on 1/2Vcc, the period relative with the

capacitance on the Bypass pin. Higher CB value will extend the stable time, and also can suppress the

noise when power-on. In supply voltage=5V and CB=1µF, stable time is about 200mS。The value of CB

also relative with the value of the DC blocking capacitor connected in input terminal. In general

condition the time constant of DC blocking capacitor should be less than CB stable time.

Recommend parts values please refer to application circuit.

CB and delay time, please refer to following table:

CB

0.01uF

0.1uF

0.22uF

0.47uF

1.0uF

TON

2ms

20ms

44ms

94ms

200ms

VOLUME CONTROLLER

The PT2305 has a built-in 31 steps volume controller, output volume is determinate by voltage applied

at the DC Vol pin. Range is from 0dB ~ -75dB. The lower DC voltage is means more volume

attenuation. The attenuation levels are -1dB/step from 0dB ~ -6dB, -2dB/step from -6dB ~ -36dB,

-3dB/step from -36dB ~ -47dB, -4dB/step from -47dB ~ -51dB, -5dB/step from -51dB ~ -66dB and

-12dB/step to the last step at -78dB.

About relation between the volume setup and DC Vol, please refer to the following table.

PT2305 V1.1

-5-

May, 2005

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