Advance Datasheet
Low-Power Off-line Primary Side Regulation Controller AP3772
Dec. 2011 Rev. 1. 0 BCD Semiconductor Manufacturing Limited
1
General Description
The AP3772 is a high performance AC/DC power
supply controller for battery charger and adapter
applications. The device uses Pulse Frequency
Modulation (PFM) method to build discontinuous
conduction mode (DCM) flyback power supplies.
The AP3772 provides accurate constant voltage,
constant current (CV/CC) regulation without
requiring an opto-coupler and the secondary control
circuitry. It also eliminates the need of loop
compensation circuitry while maintaining good
stability. The AP3772 can achieve excellent
regulation and high average efficiency, yet meets
no-load consumption less than 30mW. It can also
achieve excellent dynamic performance while
maintaining 30mW standby power with AP4340.
The AP3772 has a built-in fixed cable voltage drop
compensation function. The magnitude of the cable
compensation voltage is set as 6%, 3% and 0 of the
rated output voltage respectively to meet various
cables with different length and gauge. It also has an
adjustable built-in line compensation function to
achieve tight CC.
The AP3772 is available in SOT-23-6 package.
Features
• Primary Side Control for Tight Constant Current
and Constant Voltage
• 30mW No-load Input Power
• Excellent Dynamic Performance with AP4340
• Bipolar Junction Transistor (BJT) Driving
• Proprietary Adjustable Line Compensation for
CC Variation
• Constant and Built-in 6%, 3% and No Cable
Voltage Drop Compensation
• Enhanced Audio Noise Suppression
• Open Circuit Protection
• Over Voltage Protection
• Short Circuit Protection
• SOT-23-6 package
Applications
• Adapters/Chargers for Cell/cordless Phones,
PDAs, MP3 and Other Portable Devices
• LED Driver
• Standby and Auxiliary Power Supplies
Figure 1. Package Type of AP3772
SOT-23-6
