18W Boosted Mono Class D Amplifier
Features
• Anti-Clipping Function (ACF)
• Spread spectrum technology
• Output Power
18W (VBAT=3.7V, RL=4Q, THD+N=10%, fIN= 1kHz)
16W (VBAT=3.7V, RL=4Q, THD+N=1%, fIn = 1kHz)
• Power Supply VBAT: 3.0V~12V
• High Eficiency Class H Boost Converter
-Multiple boost voltages automatically adjust
Class D audio amplifier (HT81293A)
-Extends the playing time in battery supply
applications
-Adjustable switch peak current limit to avoid
over-pulling on battery current
• Over Current Protection, Thermal Protection, over
voltage protection function included
• Pb-Free Packages, ESOP16
Description
HT81293, integrated with a boost converter, is a mono Class D audio amplifier that drives up to continuous 1 8W (10% THD+N, 1kHz) into 4ohm speaker from a Li-battery voltage.
HT81293A integrates an adaptive boost converter that generates a Class D amplifier supply rail tracking the audio signal, which will significantly improve the efficiency and extends the playing time in battery supply applications. The output voltage of boost converter in HT81293F is forced into 9V or 12V and it provides to the class D amplifier. Configurable current limit is adopted to avoid accidental large peak current.
HT81293 features Anti-Clipping Function (ACF) which detects output signal clip due to the over input signal and suppresses the output signal clip automatically. Also, the ACF function can adapt the output clip caused by power supply voltage down with battery. It can significantly improve the sound quality, creating a very comfortable musical enjoyment, and to protect the speakers from overload damage. It supplies 2 different ACF mode with different audio experience, and also ACF OFF mode.
HT81293 integrates Spread Spectrum Control technology to achieve advanced EMI suppression. The Gain of HT81293 is 32dB .
As for protection function, over current protection function for speaker output terminals, over temperature protection function and over voltage protection for boost converter output are also prepared.
