UTC7266 データシートの表示（PDF） - Unspecified

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UTC7266

7+7W DUAL BRIDGE AMPLIFIER

Unspecified 

UTC7266

LINEAR INTEGRATED CIRCUIT

APPLICATION SUGGESTION

STAND-BY AND MUTE FUNCTIONS

(A) 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 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

Figure 1: Microprocessor Application 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 mantain 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.

YOUWANG ELECTRONICS CO.LTD

4

2010.03.02 V1.0

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