Features
Single supply voltage 4.5V ~ 26V for loudspeaker driver Built-in LDO output 5V for others
Supports Multiple Output Configurations BTL Mode: 30W/CH into 8Ω at 24 V BTL Mode: 30W/CH into 4Ω at 18 V
Loudspeaker performance BTL Mode: 30W/CH into 8Ω <1% THD+N@24V BTL Mode: 30W/CH into 4Ω <1% THD+N@18V
>90% efficient Class-D operation eliminates need for heat sink
Energy Saving Class-D Operation Low Idle Current <23mA
Multiple Switching Frequencies AM Avoidance Master/Slave Synchronization 300KHz to 1.2MHz Switching Frequency
Differential inputs
Four selectable, fixed gain settings
Internal oscillator
Short-Circuit protection with auto recovery
Under-Voltage detection
Over-Voltage protection
Pop noise and click noise reduction
Adjustable Automatic Gain Control or adjustable power limit function for speaker protection
Output DC detection for speaker protection
Thermal fold-back control
Over temperature protection with auto recovery Applications
TV audio
Boom-Box
Powered speaker
Monitors
Consumer Audio Equipment Description The AD52070 is a high efficiency stereo class-D audio amplifier with adjustable power limit function. It can deliver 30W/CH output power into 4Ω or 8Ω loudspeaker within 1% THD+N at 24V supply voltage. The AD52070 has low idle current mode for battery-powered audio system and helps to extend the batter life. The advanced oscillator/PLL circuit employs a multiple switching frequency option to avoid AM interferences. In order to achieve multi-channels application, which the clock slave mode design with, making it possible to synchronize multiple devices. The Automatic Gain Control (AGC) is enabled to prevent output signal from distortion when the input signal exceeds a threshold level. The AGC allows adjustment of maximum output voltage without signal clipping for enhanced speaker protection and audio quality. The power-limit control can provide further limit output power level of amplifier. The adjustable power limit function allows user to set a voltage to limit the amount of current through the speaker. All these functions are performed automatically. Output DC detection prevents speaker damage from long-time current stress. AD52070 output short circuit and over temperature protection include auto-recovery feature.