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FAN4800AU

更新时间： 2024-09-18 12:28:11

品牌	Logo	应用领域
飞兆/仙童 - FAIRCHILD		功率因数校正控制器
页数	文件大小	规格书
20页	987K
描述
PFC/ PWM Controller Combination

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中文翻译

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数据手册

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FAN4800AU 数据手册

October 2011

FAN4800AU/CU

PFC/ PWM Controller Combination

Features

Description

Pin-to-Pin Compatible with ML4800, FAN4800,

CM6800, and CM6800A

The highly integrated FAN4800AU/CU parts are

specially designed for power supplies that consist of

boost PFC and PWM. They require very few external

components to achieve versatile protections and

compensation. They are available in 16-pin DIP and

SOP packages.

PWM Configurable for Current-Mode or

Feed-Forward Voltage-Mode Operation

Internally Synchronized Leading-Edge PFC and

Trailing-Edge PWM in One IC

The PWM can be used in current or Voltage Mode. In

Voltage Mode, feed-forward from the PFC output bus

can reduce secondary output ripple.

Low Operating Current

Innovative Switching-Charge Multiplier Divider

Average-Current-Mode for Input-Current Shaping

PFC Over-Voltage and Under-Voltage Protections

PFC Feedback Open-Loop Protection

Cycle-by-Cycle Current Limiting for PFC/PWM

Power-on Sequence Control and Soft-Start

Line Sagging Protection

To evaluate FAN4800AU/CU for replacing existing

FAN4800A/C, FAN4800AS/CS, old version FAN4800

and ML4800 boards, six things must be completed

before the fine-tuning procedure:

1. Change R_ACresistor from the old value to a higher

resistor value: 6M to 8M.

2. Change RT/CT pin from the existing values to

R_T=6.8K and C_T=1000pF to have f_PFC=64kHz and

_PWM=64kHz.

f_RTCT=4•f_PFC=4•f_PWMfor FAN4800AU

f_RTCT=4•f_PFC=2•f_PWMfor FAN4800CU

3. The VRMS pin needs to be 1.224V at V_IN=85V_ACfor

universal input application with line input from

85V_ACto 270 V_AC

Applications

4. Change ISENSE pin filter from the exiting values to

Desktop PC Power Supply

Internet Server Power Supply

LCD TV/ Monitor Power Supply

UPS

R_Filter=51 and C_Filter=0.01µF for higher bandwidth.

5. At full load, the average V_VEAmust be ~4.5V and

ripple on V_VEAneeds to be less than 400mV.

6. For the SS pin, the soft-start current has been

reduced to half the FAN4800 capacitor.

Battery Charger

There are two differences from FAN4800AS/CS to

FAN4800AU/CU:

DC Motor Power Supply

Monitor Power Supply

Telecom System Power Supply

Distributed Power

Add Line Sagging Protection

Fix Inductance Current Instability during AC Cycle

Drop Test

Related Resources

AN-8027 — FAN480X PFC+PWM Combination

Controller Application

FAN4800AU/CU • Rev. 1.0.0

www.fairchildsemi.com

12 3 4 5 6 7...20

中文翻译

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与FAN4800AU相关器件

型号	品牌	获取价格	描述	数据表
FAN4800AUM	FAIRCHILD	获取价格	PFC/ PWM Controller Combination
FAN4800AUM	ONSEMI	获取价格	CCM PFC + PWM 组合控制器，线路下垂保护
FAN4800AUN	FAIRCHILD	获取价格	PFC/ PWM Controller Combination
FAN4800AUN	ONSEMI	获取价格	CCM PFC + PWM 组合控制器，线路下垂保护
FAN4800C	FAIRCHILD	获取价格	PFC/PWM Controller Combination
FAN4800CMY	FAIRCHILD	获取价格	PFC/PWM Controller Combination
FAN4800CMY	ONSEMI	获取价格	CCM PFC + PWM Combination Controller, 2500-REEL
FAN4800CNY	FAIRCHILD	获取价格	PFC/PWM Controller Combination
FAN4800CNY	ONSEMI	获取价格	CCM PFC + PWM Combination Controller, MDIP 16L, 9000-RAIL
FAN4800CS	FAIRCHILD	获取价格	PFC/PWM Controller Combination

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