FEATURES

Primary‐side sensing and regulation without A431 and opto‐coupler

High precision constant voltage and current regulation at universal AC input

Multi‐mode PWM/PFM operation for efficiency improving

Integrated 2A 650V MOSFET

Good dynamic response with synchronous rectifier application

Programmable CV and CC regulation

Built‐in primary winding inductance compensation

Programmable cable drop compensation

No need for control loop compensation

Audio noise free operation

Built‐in leading edge blanking (LEB)

Ultra low start‐up current and low operating current

Comprehensive protection coverage with auto‐recovery

On‐chip OTP

VDD over voltage protection

VDD under voltage lockout with hysteresis (UVLO)

Cycle‐by‐Cycle current limiting

Feedback loop open protection

Outpu t shor t circui t pr o tection

Available in SOP7 package

DESCRIPTION

AP8012A is a high performance offline PSR power switch for low power AC/DC charger and adapter applications. It operates in primary‐side sensing and regulation.

Consequently, opto‐coupler and A431 could be eliminated. Proprietary Constant Voltage (CV) and Constant Current (CC) control isintegrated as shown in the figure below.

In CC control, the current and output power setting can be adjusted externally by the sense resistor Rs at CS pin. In CV control, multi‐mode operations are utilized to achieve high performance and high efficiency. In addition, good load regulation is achieved by the built‐in cable drop compensation. Device operates in PFM in CC mode at large load condition and it operates in PWM with frequency reduction at light/medium load.

The chip consumes very low operation current. It achieves less than 75mW standby power to meet strict standby power standard.

AP8012A offers comprehensive protection coverage with auto‐recovery feature including Cycle‐by‐Cycle current limiting, VDD over voltage protection, feedback loop open protection, short circuit protection, built‐in leading edge blanking, VDD under voltage lockout (UVLO), OTP etc.

APPLICATIONS

Low Power AC/DC offline SMPS for

Industrial instruments: single / three‐phase meters

Outdoor monitoring / protection equipment

AC / DC with high input voltage