Product Description
TDA7297 STMicroelectronics Audio Amplifier IC 15 Multiwatt Through
Hole Mount
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 Radio 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.
