1. General description
The TFA9842BJ contains two identical audio power amplifiers. The TFA9842BJ can be
used as two Single-Ended (SE) channels with a fixed gain of 26 dB.
The TFA9842BJ comes in a 9-pin DIL-bent-SIL (DBS9P) power package. The TFA9842BJ
is pin compatible with the TFA9841J, TFA9842J, TFA9843J and the TFA9843BJ.
The TFA9842BJ contains a unique protection circuit that is solely based on multiple
temperature measurements inside the chip. This gives maximum output power for all
supply voltages and load conditions with no unnecessary audio holes. Almost any supply
voltage and load impedance combination can be made as long as thermal boundary
conditions (number of channels used, external heatsink and ambient temperature) allow
it.
2. Features
■ 1 W to 7.5 W operation possibility
■ Soft clipping
■ Standby and mute mode
■ No on or off switching plops
■ Low standby current
■ High supply voltage ripple rejection
■ Outputs short-circuit protected to ground, supply and across the load
■ Thermally protected
■ Pin compatible with the TFA9841J, TFA9842J, TFA9843J and the TFA9843BJ.
3. Applications
■ Televisions
■ Monitors
■ PC speakers
■ Boom boxes
■ Mini and micro audio receivers.
TFA9842BJ
2-channel audio amplifier (SE: 1 W to 7.5 W)
Rev. 01 — 1 March 2004 Preliminary data sheet
