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FAN4800AS

更新时间： 2024-11-25 10:27:31

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
19页	577K
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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FAN4800AS 数据手册

December 2010

FAN4800AS/CS/01S/2S

PFC/PWM Controller Combination

Features

Description

The highly integrated FAN4800AS/CS/01S/02S parts

are specially designed for power supplies that consist of

boost PFC and PWM. They require very few external

Pin-to-Pin Compatible with ML4800 and FAN4800

and CM6800 and CM6800A

PWM Configurable for Current Mode or

Feedforward Voltage-Mode Operation

components to achieve versatile protections

compensation. They are available in 16-pin DIP and

SOP packages.

Internally Synchronized Leading-Edge PFC and

Trailing-Edge PWM in One IC

The PWM can be used in either current or voltage

mode. In voltage mode, feed-forward from the PFC

output bus can reduce the 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

Brownout Protection

Compared with older productions, ML4800 and

FAN4800,

FAN4800AS/CS/01S/02S

have

lower

operation current that saves power consumption in

external devices. FAN4800AS/CS/01S/02S have

accurate 49.9% maximum duty of PWM that makes the

hold-up time longer. Brownout protection and PFC soft-

start functions available in this series are not available

in ML4800 and FAN4800.

To evaluate FAN4800AS/CS/01S/02S for replacing

existing FAN4800 and ML4800 boards, five things must

be completed before the fine-tuning procedure:

Interleaved PFC/PWM Switching

Improved Efficiency at Light Load

1. Change R_ACresister from the old value to a higher

f_RTCT=4•f_PFC=4•f_PWMfor FAN4800AS/01S

f_RTCT=4•f_PFC=2•f_PWMfor FAN4800CS/02S

resister: between 6MΩ to 8MΩ.

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

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

_PWM=64kHz.

Applications

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

for universal input application from line input from

Desktop PC Power Supply

85V_ACto 270V_AC

Internet Server Power Supply

LCD TV, Monitor Power Supply

UPS

4. At full load, the average V_VEAneeds to be ~4.5V

and the ripple of V_VEAneeds to be less than

400mV.

Battery Charger

5. For the Soft-Start pin, the soft-start current has

been reduced to half the FAN4800 capacitor.

DC Motor Power Supply

Monitor Power Supply

Telecom System Power Supply

Distributed Power

There are two differences from FAN4800A/C/01/02 to

FAN4800AS/CS/01S/02S:

1. Under-voltage protection debounce time is

extended to one second.

2. PWM gate clamp voltage is raised to 19V.

Related Resources

AN-8027 - FAN480X PFC+PWM Combination

Controller Application

FAN4800AS/CS/01S/02S • Rev. 1.0.1

www.fairchildsemi.com

12 3 4 5 6 7...19

中文翻译

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与FAN4800AS相关器件

型号	品牌	获取价格	描述	数据表
FAN4800ASMY	FAIRCHILD	获取价格	PFC/PWM Controller Combination
FAN4800ASMY	ONSEMI	获取价格	功率因数控制器 (PFC) CCM + PWM 控制器，具有浪涌能力增强
FAN4800ASMY-F116	ONSEMI	获取价格	功率因数控制器 (PFC) CCM + PWM 控制器，具有浪涌能力增强
FAN4800ASNY	FAIRCHILD	获取价格	PFC/PWM Controller Combination
FAN4800ASNY	ONSEMI	获取价格	功率因数控制器 (PFC) CCM + PWM 控制器，具有浪涌能力增强
FAN4800AU	FAIRCHILD	获取价格	PFC/ PWM Controller Combination
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

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