AP3703 Datasheet, PDF (1/9 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
AP3703
The AP3703 is a high performance AC/DC power sup- _{· Primary Side Control for Rectangular Constant}
ply controller for battery charger and adapter applica-
Current and Constant Voltage Output
tions. The device uses Pulse Frequency Modulation _{· Secondary CV/CC Control Circuitry Eliminating}
(PFM) method to build discontinuous conduction
Opto-Coupler
mode (DCM) flyback power supplies.
· No Need for Control Loop Compensation
Circuitry
The AP3703 provides accurate constant voltage, con- _{· Flyback Topology in DCM Operation}
stant current (CV/CC) regulation while removing the
opto-coupler and secondary control circuitry. It also
·
Random Frequency Modulation to Reduce
eliminates the need of loop compensation circuitry
while maintaining stability. The AP3703 achieves
·
System EMI
Maximum Switching Frequency: 60kHz
excellent regulation and high average efficiency, yet ^{· Built-in Soft Start}
meets the requirement for no-load consumption less ^{· Open Feedback Protection}
than 100mW.
· Over Voltage Protection
· Short Circuit Protection
The AP3703 is available in SOT-23-5 package.
· Small SOT-23-5 package to achieve compact size
and less component
Applications
· Adapters/Chargers for Cell/Cordless Phones,
PDAs, MP3 and Other Portable Apparatus
· Standby and Auxiliary Power Supplies
· LED Driver
Dec. 2011 Rev. 1. 6
SOT-23-5
Figure 1. Package Type of AP3703
BCD Semiconductor Manufacturing Limited
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