AP3765 datasheet(1/9 Pages) BCDSEMI

Part #	AP3765

Description	LOW-POWER OFF-LINE PRIMARY SIDE REGULATION CONTROLLER

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Manufacturer	BCDSEMI [BCD Semiconductor Manufacturing Limited]

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LOW-POWER OFF-LINE PRIMARY SIDE REGULATION CONTROLLER

AP3765

Preliminary Datasheet

1

BCD Semiconductor Manufacturing Limited

Feb. 2010 Rev. 1. 0

General Description

The AP3765 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 AP3765 provides accurate constant voltage, con-

stant current (CV/CC) regulation while removing the

opto-coupler and secondary control circuitry. It also

eliminates the need of loop compensation circuitry

while maintaining stability. The AP3765 achieves

excellent regulation and high average efficiency, yet

meets the requirement for no-load consumption less

than 30mW.

The AP3765 is available in SOT-23-6 package.

Features

·

Primary Side Control for Rectangular Constant

Current and Constant Voltage Output

·

Sub-microampere Start-up Current

·

30mW No-load Input Power Feasible

·

Tight CV Regulation Performance

·

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

·

Built-in Soft Start

·

Open Feedback Protection

·

Short Circuit Protection

·

SOT-23-6 Package

Applications

·

Adapters/Chargers for Cell/Cordless Phones,

PDAs, MP3 and Other Portable Apparatus

·

LED Drivers

·

Standby and Auxiliary Power Supplies

Figure 1. Package Type of AP3765

SOT-23-6

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AP3765 Datasheet(PDF) 1 Page - BCD Semiconductor Manufacturing Limited

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