FAN4800 Fairchild Semiconductor, FAN4800 Datasheet

FAN4800

Manufacturer Part Number

FAN4800

Description

Low Start-Up Current PFC/PWM Controller Combos

Manufacturer

Fairchild Semiconductor

Datasheet

1.FAN4800.pdf (20 pages)

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Download datasheet (336Kb)

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FAN4800 Rev. 1.0.5

FAN4800

Low Start-Up Current PFC/PWM Controller Combos

Features

Applications

Ordering Information

Low start-up current (100µA typical)

Low operating current (2.5mA typical)

Low total harmonic distortion, high power factor

Pin-compatible upgrade for the ML4800

Average current, continuous or discontinuous boost,

leading-edge PFC

Slew rate enhanced transconductance error amplifier

for ultra-fast PFC response

Internally synchronized leading edge PFC and trailing-

edge PWM

Reduction of ripple current in the storage capacitor

between the PFC and PWM sections

PWM configurable for current-mode or voltage-mode

operation

Additional folded-back current limit for PWM section

20V BiCMOS process

Current-fed gain modulator for improved noise

immunity

Brownout control, over-voltage protection, UVLO,

soft-start, and reference OK

Available in 16-DIP, 16-SOIC (wide) packages

Desktop PC Power Supply

Internet Server Power Supply

Uninterruptible Power Supply (UPS)

Battery Charger

DC Motor Power Supply

Monitor Power Supply

Telecom System Power Supply

Distributed Power

Part Number

FAN4800IMX

FAN4800IN

FAN4800IM

OK guaranteed turn-on PWM at 2.25V

OVP comparator, low-power detect comparator

-40°C to +125°C

Temp. Range

Operating

Pb-Free

Yes

Description

The FAN4800 is a controller for power-factor-corrected,

switched-mode power supplies. Power Factor Correction

(PFC) allows the use of smaller, lower-cost bulk capaci-

tors, reduces power line loading and stress on the

switching FETs, and results in a power supply that fully

complies with IEC-1000-3-2 specifications. Intended as a

BiCMOS version of the industry-standard ML4800, the

FAN4800 includes circuits for the implementation of

leading edge, average current, boost-type power factor

correction, and a trailing-edge Pulse Width Modulator

(PWM). A gate driver with 1A capabilities minimizes the

need for external driver circuits. Low-power require-

ments improve efficiency and reduce component costs.

An over-voltage comparator shuts down the PFC section

in the event of a sudden decrease in load. The PFC sec-

tion also includes peak current limiting and input voltage

brownout protection. The PWM section can be operated

in current or voltage mode, at up to 250kHz, and

includes an accurate 50% duty cycle limit to prevent

transformer saturation.

The FAN4800 includes a folded-back current limit for the

PWM section to provide short-circuit protection.

Package

16-SOIC

16-PDIP

Tape & Reell

Packing

Method

Rail

16-SOIC

November 2006

FAN4800

www.fairchildsemi.com

Marking

Code

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