AP3768 Datasheet, PDF (1/10 Pages) BCD Semiconductor Manufacturing Limited – LOW-POWER OFF-LINE PRIMARY SIDE REGULATION CONTROLLER

Preliminary Datasheet
LOW-POWER OFF-LINE PRIMARY SIDE REGULATION CONTROLLER
General Description
Features
AP3768
The AP3768 is a high performance AC/DC power sup-
ply controller for battery charger and adapter applica-
tions. The device uses Pulse Frequency Modulation
(PFM) method to build discontinuous conduction
mode (DCM) flyback power supplies.
The AP3768 provides accurate constant voltage, con-
stant current (CV/CC) regulation without requiring an
opto-coupler and secondary control circuitry. It also
eliminates the need of loop compensation circuitry
while maintaining stability. The AP3768 achieves
excellent regulation and high average efficiency, yet
meets the requirement for no-load consumption less
than 30mW.
The AP3768 has the built-in programmable cable volt-
age drop compensation function, which make it flexi-
ble to accommodate various cables with different
gauges and lengths.
· Primary Side Control for Eliminating Opto-cou-
pler and Secondary CV/CC Control Circuitry
· 30mW No-load Input Power
· Programmable Output Cable Voltage Drop Com-
pensation
· Proprietary CC Tightening Technique to Achieve
Vertical CC Profile
· Compensation for External Component Tempera-
ture Variations
· Flyback Topology in DCM Operation
· Random Frequency Adjustment to Reduce Sys-
tem EMI
· Built-in Soft Start
· Over Voltage Protection
· Short Circuit Protection
· SOIC-8 Package
Applications
The AP3768 is available in SOIC-8 package.
· Adapter/Chargers for Cell/Cordless Phones,
PDAs, MP3 and Other Portable Apparatus
· LED Driver
· Standby and Auxiliary Power Supplies
Aug. 2010 Rev. 1. 0
SOIC-8
Figure 1. Package Type of AP3768
BCD Semiconductor Manufacturing Limited
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