TPA3100D2 Datasheet, PDF (23/31 Pages) Texas Instruments – 20-W STEREO CLASS-D AUDIO POWER AMPLIFIER

TPA3100D2
www.ti.com
SLOS469B – OCTOBER 2005 – REVISED OCTOBER 2005
MSTR/SLV and SYNC operation
The MSTR/SLV and SYNC terminals can be used to synchronize the frequency of the class-D output switching.
When the MSTR/SLV terminal is high, the output switching frequency is determined by the selection of the
resistor connected to the ROSC terminal (see ROSC Resistor Selection). The SYNC terminal becomes an output
in this mode, and the frequency of this output is also determined by the selection of the ROSC resistor. This TTL
compatible, push-pull output can be connected to another TPA3100D2, configured in the slave mode. The output
switching is synchronized to avoid any beat frequencies that could occur in the audio band when two class-D
amplifiers in the same system are switching at slightly different frequencies.
When the MSTR/SLV terminal is low, the output switching frequency is determined by the incoming square wave
on the SYNC input. The SYNC terminal becomes an input in this mode and accepts a TTL compatible square
wave from another TPA3100D2 configured in the master mode or from an external GPIO. If connecting to an
external GPIO, recommended frequencies are 200 kHz to 300 kHz for proper device operation, and the
maximum amplitude is 4 V.
USING LOW-ESR CAPACITORS
Low-ESR capacitors are recommended throughout this application section. A real (as opposed to ideal) capacitor
can be modeled simply as a resistor in series with an ideal capacitor. The voltage drop across this resistor
minimizes the beneficial effects of the capacitor in the circuit. The lower the equivalent value of this resistance,
the more the real capacitor behaves like an ideal capacitor.
23