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Preliminary Datasheet

LOW POWER PWM CONTROLLER FOR OFF-LINE ADAPTER

General Description

The AP3710 is a green-mode PWM controller, its main

applications are low power supplies such as offline

battery chargers, adapters, STB and other auxiliary

supplies, where the needs for low no load power, low

total cost and high reliability are all required.

The functional blocks of AP3710 include: under volt-

age lockout with low start-up current; precise voltage

reference for internal comparators; PWM comparator

with current limit control, feedback signal and band-

gap input; short circuit comparator and open circuit

protection for opto-coupler.

The AP3710 operates at a fixed 60kHz switching fre-

quency, its output connects to the emitter of high volt-

age NPN transistor or the source of MOSFET. In

normal mode, it works as a switch to turn on or turn off

the external transistor. In failure modes like open loop,

over voltage or overload due to short circuit, the chip

enters into an auto restart mode controlled by the inter-

nal protection unit.

The AP3710 is available in SOIC-8 and DIP-8 pack-

ages.

AP3710

Features

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Current Mode Control with Skip Cycle Capability

Low Start-up Current: 0.25 mA

Low Operating Current: 0.45mA

Output Current Capacity: 900 mA

Fixed Switching Frequency: 60 kHz

Frequency Dithering for Low EMI

Under-Voltage Lockout with Hysteresis

Built-in Slope Compensation

Short Circuit Protection

Open and Short Circuit Protection for Opto-

Coupler

Maximum Input Power is 0.2W under No Load

Maximum Input Power is 1W under 0.5W Load

Low Total Cost Solution

Applications

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Adapters

Battery Chargers

Set Top Boxes

Auxiliary Supplies

DVD

SOIC-8

DIP-8

Figure 1. Package Types of AP3710

Nov. 2007 Rev. 1. 2

1

BCD Semiconductor Manufacturing Limited

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