ESMT
Preliminary
AD52068
Elite Semiconductor Memory Technology Inc. Publication Date: Oct. 2015
Revision: 0.01 1/20
2x20W Stereo Class-D Audio Amplifier with Power Limit
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 8Ω @<10% THD+N
PBTL Mode: 40W/CH into 4Ω @<10% THD+N
Loudspeaker power from 12V supply
BTL Mode: 9W/CH into 8Ω @10% THD+N
87% 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 8Ω loudspeaker within 10% 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 4Ω
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.
Simplified Application Circuit
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