Datasheet > AN4129

AN4129

更新时间： 2024-11-14 03:18:47

品牌	Logo	应用领域
飞兆/仙童 - FAIRCHILD		控制器
页数	文件大小	规格书
12页	358K
描述
Green Current Mode PWM Controller FAN7601

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AN4129 数据手册

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Application Note AN4129

Green Current Mode PWM Controller FAN7601

FAN7601.

1. Introduction

It contains the following blocks.

This application note describes the operation and features of

• Start-up circuit and reference

the FAN7601. This device is a BCDMOS programmable

• Oscillator

frequency current mode PWM controller which is designed

• Soft start and latch

for off-line adapter applications and auxiliary power

• Current sense and feed back

supplies. To reduce power loss at light and no load, the

• Burst mode

FAN7601 operates in burst mode and it includes a start-up

• Output drive

switch to reduce the losses in the start-up circuit.

Because of the internal start-up switch and burst mode oper-

ation, it is possible to supply an output power of 0.5W with

under 1W input power when the input line voltage is 265V.

On no load condition, input power is under 0.3W.

The FAN7601 offers a latch protection pin for the protection

of the system e.g. over voltage protection and/or thermal

shutdown.

The internal over voltage protection function shuts down the

IC operation when the supply voltage reaches 19V.

In addition, a soft start function is provided, and the soft start

time can be varied. Figure 1 shows a block diagram for the

Vref

Vstr

Vcc

OVP

Enable

−

Start-up

Circuit

5V Ref

19V

Rt/Ct

OSC

Vref

UVLO

−

12V/8V

12uA

OUT

1.5V

Latch/SS

OVP

−

2.5V

−

Delay Circuit

Reset

Circuit

2 CS/FB

−

0.97V/0.9V

Start-up

Circuit

−

Latch/SS

GND

−

Figure 1. Internal Block Diagram of the FAN7601

Rev. 1.0.1

12 3 4 5 6 7...12

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