高效开关电源芯片NCP4303特性及应用简介
NCP4303主要特性：
Self−Contained Control of Synchronous Rectifier in CCM, DCM, and QR Flyback Applications
Precise True Secondary Zero Current Detection with Adjustable Threshold
Automatic Parasitic Inductance Compensation Input
Typically 40 ns Turn off Delay from Current Sense Input to Driver
Zero Current Detection Pin Capability up to 200 V
Ultrafast Trigger Interface to External Signal for CCM operation
Disable Input to Enter Standby or Low Consumption Mode
Adjustable Minimum On Time Independent of VCC Level
Adjustable Minimum Off Time Independent of VCC Level
5 A / 2.5 A Peak Current Sink / Source Drive Capability
Operating Voltage Range up to 30 V
Gate Drive Clamp of Either 12 V (NCP4303A) or 6 V (NCP4303B)
Low Startup and Standby Current Consumption
Maximum Frequency of Operation up to 500 kHz
SOIC−8 Package
These are Pb−Free Devices
NCP4303典型应用：
Notebook Adapters
High Power Density AC/DC Power Supplies
Gaming Consoles
All SMPS with High Efficiency Requirements
图1。NCP4303方框图
图2。NCP4303 ZCD检测电路框图