Part number : TDA7297
Functions : 15 W + 15 W Dual Bridge Amplifier
Package information : Multiwatt 15 type
Manufacturer : STMicroelectronics ( https://www.st.com/ )
The TDA7297 is a dual bridge amplifier specially designed for TV and Portable Radio applications.
1. WIDE SUPPLY VOLTAGE RANGE (6V -18V)
2. MINIMUM EXTERNAL COMPONENTS
– NO SVR CAPACITOR
– NO BOOTSTRAP
– NO BOUCHEROT CELLS
– INTERNALLY FIXED GAIN
3. STAND-BY & MUTE FUNCTIONS
4. SHORT CIRCUIT PROTECTION
5. THERMAL OVERLOAD PROTECTION
[ … ]
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. 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.