Datasheet > AP3720

AP3720

更新时间： 2024-11-23 12:50:19

品牌	Logo	应用领域
BCDSEMI		控制器
页数	文件大小	规格书
13页	681K
描述
CURRENT MODE PWM CONTROLLER FOR BJT

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AP3720 数据手册

Preliminary Datasheet

CURRENT MODE PWM CONTROLLER FOR BJT AP3720

General Description

Features

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.

•

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

•

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.

Applications

•

STB

Cable Modem

ADSL Modem

DVD Recorder

DIP-8

SOIC-8

Figure 1. Package Types of AP3720

Jul. 2009 Rev. 1. 0

BCD Semiconductor Manufacturing Limited

12 3 4 5 6 7...13

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