1FEATURES
23• 10-W/Ch Stereo Into an 8-Ω Load From a 24-V
Supply
• 15-W/Ch Stereo Into a 4-Ω Load from a 22-V
Supply
• 30-W/Ch Mono Into an 8-Ω Load from a 22-V
Supply
• Operates From 10 V to 26 V
• Can Run From +24 V LCD Backlight Supply
• Efficient Class-D Operation Eliminates Need
for Heat Sinks
• Four Selectable, Fixed-Gain Settings
• Internal Oscillator to Set Class D Frequency
(No External Components Required)
• Single-Ended Analog Inputs
• Thermal and Short-Circuit Protection With
Auto Recovery
• Space-Saving Surface Mount 24-Pin TSSOP
Package
• Advanced Power-Off Pop Reduction

APPLICATIONS
• Flat Panel Display TVs
• DLP® TVs
• CRT TVs
• Powered Speakers

DESCRIPTION
The TPA3121D2 is a 15-W (per channel), efficient,
class-D audio power amplifier for driving stereo
speakers in a single-ended configuration or a mono
speaker in a bridge-tied-load configuration. The TPA3121D2 can drive stereo speakers as low as 4 Ω.
The efficiency of the TPA3121D2 eliminates the need
for an external heat sink when playing music.
The gain of the amplifier is controlled by two gain
select pins. The gain selections are 20, 26, 32, and
36 dB.
The patented start-up and shutdown sequences
minimize pop noise in the speakers without additional
circuitry.