基于NCP4303設計的高效開關電源技術

NCP4303是次級同步整流驅動器，是高效開關電源（SMPS）解決方案。NCP4303具有閾值可調的精密的次級零電流檢測，工作模式包括CCM，DCM和QR反激拓撲。工作電壓高達30V，具有5A/2.5A峰值沉/源驅動能力，典型應用包括筆記本電腦適配器，大功率密度的AC/DC電源，游戲機和所有高效開關電源。

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典型應用：

Notebook Adapters

High Power Density AC/DC Power Supplies

Gaming Consoles

All SMPS with High Efficiency Requirements

圖1。NCP4303方框圖

圖2。NCP4303 ZCD檢測電路框圖

圖3。NCP4303典型應用案例：LLC轉換器