AP3768 datasheet(1/10 Pages) BCDSEMI

Part #	AP3768

Description	LOW-POWER OFF-LINE PRIMARY SIDE REGULATION CONTROLLER

PDF	10 Pages

Scroll/Zoom	100%

Manufacturer	BCDSEMI [BCD Semiconductor Manufacturing Limited]

Direct Link	http://www.bcdsemi.com

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LOW-POWER OFF-LINE PRIMARY SIDE REGULATION CONTROLLER

AP3768

Preliminary Datasheet

1

BCD Semiconductor Manufacturing Limited

Aug. 2010 Rev. 1. 0

General Description

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.

The AP3768 is available in SOIC-8 package.

Features

·

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

·

Adapter/Chargers for Cell/Cordless Phones,

PDAs, MP3 and Other Portable Apparatus

·

LED Driver

·

Standby and Auxiliary Power Supplies

Figure 1. Package Type of AP3768

SOIC-8

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