TDA7266-J15-D-T データシートの表示（PDF） - Unisonic Technologies

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TDA7266-J15-D-T

7+7W DUAL BRIDGE AMPLIFIER

Unisonic Technologies 

TDA7266

„ APPLICATION SUGGESTION

LINEAR INTEGRATED CIRCUIT

For Microprocessor Application

In order to avoid annoying ”Pop-Noise” during Turn-On/Off transients, it is necessary to guarantee the right ST-BY

and MUTE signals sequence. It is quite simple to obtain this function using a microprocessor (Fig 1 and Fig 2).

At first ST-BY signal (from mP) goes high and the voltage across the ST-BY terminal (Pin 7) starts to increase

exponentially. The external RC network is intended to turn-on slowly the biasing circuits of the amplifier, this to

avoid ”POP” and ”CLICK” on the outputs.

When this voltage reaches the ST-BY threshold level, the amplifier is switched-on and the external capacitors in

series to the input terminals (C3, C5) start to charge.

It’s necessary to maintain the mute signal low until the capacitors are fully charged, this to avoid that the device

goes in play mode causing a loud “Pop Noise” on the speakers.

A delay of 100 ~ 200ms between ST-BY and MUTE signals is suitable for a proper operation.

IN1

ST-BY

C1

0.22µF

R1

10k

4

7

C2

10µF

Vcc

3 13

C5

470µF

1 OUT1+

C6

100nF

S-GND 9

µP

C3

2 OUT1-

0.22µF

IN2

TDA7266

12

15 OUT2+

MUTE

6

R2 C4

10k 1µF

PW-GND 8

14 OUT2-

Fig. 1 Microprocessor Application

UNISONIC TECHNOLOGIES CO., LTD

www.unisonic.com.tw

5 of 8

QW-R107-037,C

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