FAN4801

更新时间： 2024-09-18 06:58:43

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
24页	641K
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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FAN4801 数据手册

April 2009

FAN4800A/C, FAN4801/1S/2/2L

PFC/PWM Controller Combination

Features

Description

The

highly

integrated

FAN4800A/C

and

Pin-to-Pin Compatible with ML4800 and FAN4800

and CM6800 and CM6800A

FAN4801/1S/2/2L are specially designed for power

supplies that consist of boost PFC and PWM. They

require very few external components to achieve

versatile protections / 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 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

Peak Current Limiting for PFC

Compared with older productions, ML4800 and

FAN4800, FAN4800A/C and FAN4801/1S/2/2L have

lower operation current that save power consumption in

external devices. FAN4800A/C and FAN4801/1S/2/2L

have accurate 49.9% maximum duty of PWM that

makes the hold-up time longer. Specifically, the

brownout protection and PFC soft-start functions are not

in ML4800 and FAN4800.

Cycle-by-Cycle Current Limiting for PWM

Power-On Sequence Control and Soft-Start

Brownout Protection

To start evaluating FAN4800A/C, FAN4801/1S/2/2L for

replacing existing FAN4800 and ML4800 boards, five

things must be done before the fine-tuning procedure:

Interleaved PFC/PWM Switching

1. Change R_ACresister from the old value to a higher

FAN4801/1S/2/2L Improve Efficiency at Light Load

resister: between 6MΩ to 8MΩ.

f_RTCT=4•f_PFC=4•f_PWMfor FAN4800A and

FAN4801/1S

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

R_T=6.8KΩ and C_T=1000pF to have f_PFC=64KHz,

_PWM=64KHz.

f_RTCT=4•f_PFC=2•f_PWMfor FAN4800C and

FAN4802/2L

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

universal input application from line input from

85V_ACto 270 V_AC. Both poles for the V_rmsof

FAN4801/1S/2/2L don’t need to substantially

slower than FAN4800; about 5 to 10 times.

Applications

Desktop PC Power Supply

4. At full load, the average V_EAneeds to ~4.5V and

the ripple on the V_EAneeds to be less than 400mV.

Internet Server Power Supply

LCD TV, Monitor Power Supply

UPS

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

reduced to half from the FAN4800 capacitor.

Battery Charger

DC Motor Power Supply

Monitor Power Supply

Telecom System Power Supply

Distributed Power

Related Resources

Complete design instructions are detailed in application

note AN-6078SC (available in Chinese only).

FAN4800A/C, FAN4801/1S/2/2L • Rev. 1.0.2

www.fairchildsemi.com

12 3 4 5 6 7...24

中文翻译

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与FAN4801相关器件

型号	品牌	获取价格	描述	数据表
FAN4801MY	FAIRCHILD	获取价格	PFC/PWM Controller Combination
FAN4801MY	ONSEMI	获取价格	CCM PFC + PWM Combination Controller, 2500-REEL
FAN4801NY	FAIRCHILD	获取价格	PFC/PWM Controller Combination
FAN4801NY	ONSEMI	获取价格	CCM PFC + PWM 组合控制器
FAN4801S	FAIRCHILD	获取价格	PFC/PWM Controller Combination
FAN4801SMY	FAIRCHILD	获取价格	PFC/PWM Controller Combination
FAN4801SMY	ONSEMI	获取价格	功率因数控制器 (PFC) CCM + PWM 控制器，浪涌能力增强
FAN4801SNY	FAIRCHILD	获取价格	PFC/PWM Controller Combination
FAN4801SNY	ONSEMI	获取价格	功率因数控制器 (PFC) CCM + PWM 控制器，浪涌能力增强
FAN4802	FAIRCHILD	获取价格	PFC/PWM Controller Combination

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