低启动电流PFC / PWM控制器套装 Low Start-Up Current PFC/PWM Controller Combos
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