SF5566B数据手册SiFirst中文资料规格书

描述 Description

SF5566B is a high performance, high efficiency, highly integrated current mode PWM controller for offline flyback converter applications.
 
In SF5566B, PWM switching frequency with shuffling is fixed 65KHz and is trimmed to tight range. When the output power demands decrease, the IC decreases switching frequency based on the proprietaryη-BalanceTM control to boost power conversion efficiency at the light load. When output power falls below a given value, the IC enters into burst mode and can achieve less than 75mW no load power.
 
The IC can achieve “Zero OCP/OPP Recovery Gap” using SiFirst’s proprietary control algorithm. SF5566B also has built in proprietary “Audio Noise Free OCP Compensation”, which can achieve constant power limiting and can achieve audio noise operation at heavy loading when line input is around 90VAC.
 
SF5566B integrates functions and protections of Under Voltage Lockout (UVLO), VDD Over Voltage Protection (OVP), Cycle-by-cycle Current Limiting (OCP), Pins Floating Protection, Over Load Protection (OLP), Gate Clamping, VDD Clamping, Leading Edge Blanking (LEB), Soft Start, etc.
SF5566B is available in SOP8 package.

应用 Application

Offline AC/DC Flyback Converter for
◆   AC/DC Adaptors
◆   Open-frame SMPS
◆   Laptop Charger