Features  Single supply voltage 4.5V ~ 26V for loudspeaker driver Built-in LDO output 5V for others  Loudspeaker power from 24V supply BTL Mode: 20W/CH into 8 @<1% THD+N PBTL Mode: 40W/CH into 4 @<10% THD+N  Loudspeaker power from 12V supply BTL Mode: 10W/CH into 8 @10% THD+N  88% efficient Class-D operation eliminates need for heat sink  Differential inputs  Four selectable, fixed gain settings  Internal oscillator  Short-Circuit protection with auto recovery option  Under-Voltage detection  Over-Voltage protection  Pop noise and click noise reduction  Adjustable power limit function for speaker protection  Output DC detection for speaker protection  Filter-Free operation  Over temperature protection with auto recovery  Superior EMC performance Applications  TV audio  Boom-Box  Powered speaker  Monitors  Consumer Audio Equipment Description The AD52068 is a high efficiency stereo class-D audio amplifier with adjustable power limit function. The loudspeaker driver operates from 4.5V~26V supply voltage and analog circuit operates at 5V supply voltage. It can deliver 20W/CH output power into 8 loudspeaker within 1% THD+N at 24V supply voltage and without external heat sink when playing music. AD52068 provides parallel BTL (Mono) application, and it can deliver 40W into 4 loudspeaker at 24V supply voltage. The adjustable power limit function allows user to set a voltage rail lower than half of 5V to limit the amount of current through the speaker. Output DC detection prevents speaker damage from long-time current stress. AD52068 provides superior EMC performance for filter-free application. The output short circuit and over temperature protection include auto-recovery feature