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3706M-G1 Datasheet

  • 3706M-G1

  • PRIMARY SIDE CONTROL IC FOR OFF-LINE BATTERY CHARGERS

  • BCDSEMI

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Data Sheet
PRIMARY SIDE CONTROL IC FOR OFF-LINE BATTERY CHARGERS AP3706
General Description
The AP3706 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 AP3706 provides constant voltage, constant cur-
rent (CV/CC) regulation without requiring an opto-
coupler and secondary control circuitry. It also elimi-
nates the need of loop compensation circuitry while
maintaining stability.
The AP3706 achieves excellent regulation and high
power efficiency, the no-load power consumption is
less than 200mW at 265VAC input.
The AP3706 is available in SOIC-8 and DIP-8 pack-
ages.
Features
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Primary Side Control for Rectangular Constant
Current and Constant Voltage Output
Eliminates Opto-Coupler and Secondary CV/CC
Control Circuitry
Eliminates Control Loop Compensation Circuitry
Flyback Topology in DCM Operation
Random Frequency Modulation to Reduce
System EMI
Valley Turn on of External Power NPN Transistor
Built-in Soft Start
Open Circuit Protection
Over Voltage Protection
Short Circuit Protection
Applications
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Adapters/Chargers for Cell/Cordless Phones,
PDAs, MP3 and Other Portable Apparatus
Standby and Auxiliary Power Supplies
SOIC-8
DIP-8
Figure 1. Package Types of AP3706
Jul. 2008 Rev. 1.3
1
BCD Semiconductor Manufacturing Limited

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