TDA7297 STMicroelectronics Amplifier IC 15-Multiwatt for specially designed for TV and Portable Audio application

TDA7297 STMicroelectronics Amplifier IC 2-Channel (Stereo) Class AB 15-Multiwatt Linear Amplifiers Audio IC

15+15W DUAL BRIDGE AMPLIFIER DESCRIPTION:

The TDA7297 is a dual bridge amplifier specially designed for TV and Portable Ro applications.
 

Features

WIDE SUPPLY VOLTAGE RANGE (6V -18V)

MINIMUM EXTERNAL COMPONENTS

– NO SVR CAPACITOR

– NO BOOTSTRAP

– NO BOUCHEROT CELLS

– INTERNALLY FIXED GAIN

STAND-BY & MUTE FUNCTIONS

SHORT CIRCUIT PROTECTION

THERMAL OVERLOAD PROTECTION

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 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.