24 W BTL or 2 x 12 W stereo car radio power amplifier

The TDA1515BQ is a monolithic integrated class-B output amplifier in a 13-lead single in-line (SIL) plastic power package. The device is primarily developed for car radio applications, and also to drive low-impedance loads (down to 1,6Ω). At a supply voltage VP= 14,4 V, an output power of 24 W can be delivered into a 4ΩBTL (Bridge Tied Load), or, when used as stereo amplifier, it delivers 2×12 W into 2Ωor 2×7 W into 4Ω.

Special features are:

• flexibility in use−mono BTL as well as stereo

• high output power

• low offset voltage at the output (important for BTL)

• large usable gain variation

• very good ripple rejection

• internal limited bandwidth for high frequencies

• low stand-by current possibility (typ. 1 µA), to simplify required switches; TTL drive possible

• low number and small sized external components

• high reliability.

The following currently required protections are incorporated in the circuit. These protections also have positive influence on reliability in the applications.

• load dump protection

• a.c. and d.c. short-circuit safe to ground up to VP=18 V

• thermal protection

• speaker protection in bridge configuration

• SOAR protection

• outputs short-circuit safe to ground in BTL

• reverse polarity safe.