ML4800CP中文资料Power Factor Correction and PWM Controller Combo数据手册ONSEMI规格书

描述 Description

General Description
The ML4800 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 IEC1000-3-2 specification. Intended as a BiCMOS version of the industry-standard ML4824, the ML4800 includes circuits for the implementation of leading edge, average current, “boost” type power factor correction and a trailing edge, pulse width modulator (PWM). It also includes a TriFault Detect™ function to help ensure that no unsafe conditions will result from single component failure in the PFC. Gate-drivers with 1A capabilities minimize the need for external driver circuits. Low power requirements 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 section 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.

特性 Features

• Internally synchronized leading-edge PFC and trailing-
   edge PWM in one IC
• TriFault Detect™ for UL1950 compliance and enhanced
   safety
• Slew rate enhanced transconductance error amplifier for
   ultra-fast PFC response
• Low power: 200µA startup current, 5.5mA operating
   current
• Low total harmonic distortion, high PF
• Reduced ripple current in storage capacitor between PFC
   and PWM sections
• Average current, continuous boost leading edge PFC
• PWM configurable for current-mode or voltage mode
   operation
• Current fed gain modulator for improved noise immunity
• Overvoltage and brown-out protection, UVLO, and soft
   start

简介

ML4800CP属于集成电路（IC）的PFC（功率因数校正）。由制造生产的ML4800CPPFC（功率因数校正）功率因数校正 (PFC) 是用于调整交流电路中的电压和电流之间的相位角，使之趋近于零的半导体器件。不同模式包括平均电流、边界导通、连续导通、临界导通、电流控制式频率折返、不连续和不连续导通，开关频率从 6 kHz 至 1.7 MHz 可调。