AP3720 데이터 시트보기 (PDF) - BCD Semiconductor

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AP3720

CURRENT MODE PWM CONTROLLER FOR BJT

BCD Semiconductor 

Preliminary Datasheet

CURRENT MODE PWM CONTROLLER FOR BJT

AP3720

General Description

The AP3720 is a low startup current, current mode

PWM controller with green-mode operation. The

PWM switching frequency at normal operation is 65k,

but when the output power drops below the

specifically level, the device enters the

frequency-drop mode and the typical operating

frequency is 20kHz (no audible noise). Additionally,

when the load drops to a very low level or zero, the

IC operates in so called ‘burst mode’ to minimize

switching loss.

The IC integrated a lot of functions such as the

Lead-Edge Blanking (LEB) of the current sensing,

internal slope compensation, line compensation, and

several protection features. The protection functions

include cycle-by-cycle current limit (OCP), VCC

over voltage protection (OVP), OTP and OLP.

The AP3720 is available in DIP-8 and SOIC-8

packages.

Features

• Low Startup Current （ 2.5µA ） and Low

Operating Current (1.2mA)

• Off-line Converter Applied in Sub 25W Range

• Skip Cycle Mode Achieves Low Standby Power

(<200mW)

• Cycle-by-Cycle Power Limited

• Frequency-drop Mode

• Soft Start with 2ms

• Programmable Drive Current for BJT

• Leading Edge Blanking

• Pre-shutdown Decreases Turn-off Losses

• Reliable Protection:

Accurate OCP with Line Compensation

Short Circuit Protection

Over Voltage Protection for VCC

Hysteretic Thermal Shutdown Protection

Applications

• STB

• Cable Modem

• ADSL Modem

• DVD Recorder

Jul. 2009 Rev. 1. 0

DIP-8

SOIC-8

Figure 1. Package Types of AP3720

BCD Semiconductor Manufacturing Limited

1

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