AP3708N Datasheet, PDF (1/13 Pages) BCD Semiconductor Manufacturing Limited – PRIMARY SIDE CONTROL IC FOR OFF-LINE BATTERY CHARGERS

Preliminary Datasheet
PRIMARY SIDE CONTROL IC FOR OFF-LINE BATTERY CHARGERS
General Description
Features
AP3708N
The AP3708N is a high performance AC/DC power _{· Primary Side Control for Rectangular Constant}
supply controller for battery charger and adapter appli-
Current and Constant Voltage Output
cations. The device uses Pulse Frequency Modulation _{· Eliminates Opto-Coupler and Secondary CV/CC}
(PFM) method to build discontinuous conduction
Control Circuitry
mode (DCM) flyback power supplies.
· Eliminates Control Loop Compensation Circuitry
· Output Cable Resistor Compensation
The AP3708N provides accurate constant voltage, con-
stant current (CV/CC) regulation without requiring the
opto-coupler and the secondary control circuitry. It
·
·
Flyback Topology in DCM Operation
Random Frequency Modulation to Reduce
also eliminates the need of loop compensation circuitry
System EMI
while maintaining stability.
· Valley Turn on of External Power NPN Transistor
· Maximum Switching Frequency: 110kHz
The AP3708N achieves excellent regulation and high · Built-in Soft Start
power efficiency, the no-load power consumption is _{· Over Voltage Protection}
less than 150mW.
· Short Circuit Protection
The AP3708N is available in SOIC-8 package.
Applications
· Adapters/Chargers for Cell/Cordless Phones,
PDAs, MP3 and Other Portable Apparatus
· Standby and Auxiliary Power Supplies
Apr. 2009 Rev. 2. 1
SOIC-8
Figure 1. Package Type of AP3708N
BCD Semiconductor Manufacturing Limited
1