FAN4800IM Datasheet PDF - Fairchild

●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 capacitors, 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. 

●Features

●„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, continuousor 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

●„VINOK guaranteed turn-on PWM at 2.25V

●„VCCOVP comparator, low-power detect comparator

●„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

●Applications

●„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