AP3902 datasheet(1/9 Pages) BCDSEMI

Part #	AP3902

Description	LOW POWER PWM SWITCH FOR OFF-LINE SMPS

PDF	9 Pages

Scroll/Zoom	100%

Manufacturer	BCDSEMI [BCD Semiconductor Manufacturing Limited]

Direct Link	http://www.bcdsemi.com

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LOW POWER PWM SWITCH FOR OFF-LINE SMPS

AP3902

Data Sheet

1

BCD Semiconductor Manufacturing Limited

Sep. 2008 Rev. 1.0

General Description

The AP3902 PWM power switch consists of a fixed-

frequency current-mode PWM controller and a high

voltage transistor. It is specifically designed for high

performance off-line switching power supplies or non-

isolated small household applications. Compared to

discrete MOSFET and PWM controller power supply

solutions, AP3902 solution offers advantages such as

fewer component numbers, smaller size, and lower

total cost.

In normal operation, the AP3902 features with a fixed

switching frequency. When the output power falls

below a given level, the circuits automatically switches

to a burst mode by skipping some switching cycles. In

case of failure modes like open loop, over voltage or

overload due to short circuit, the device switches into

auto restart mode which is controlled by the internal

protection unit.

This IC adopts frequency dithering technique to reduce

EMI.

The AP3902 is available in DIP-8 package.

Features

·

Built-in NPN Transistor with 700VCBO

·

Current Mode Control with Skip Cycle Capability

·

Low Operating Current: 0.45mA

·

Fixed Switching Frequency: 60kHz

·

Frequency Dithering for Low EMI

·

Short Circuit Protection

·

Open and Short Circuit Protection for Opto-

Coupler

·

Maximal Input Power less than 0.2W under no

Load

·

Output Power Range:

5W to 10W for Adapter with Outer Enclosure

5W to 13W for Open Frame Application

Applications

·

Induction Cooker

·

Set-Top Boxes/DVB

·

Adapters

·

Auxiliary Power Supplies

·

DVD

Figure 1. Package Type of AP3902

DIP-8

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AP3902 Datasheet(PDF) 1 Page - BCD Semiconductor Manufacturing Limited

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