基于NCP4303設(shè)計(jì)的高效開(kāi)關(guān)電源技術(shù)

NCP4303是次級(jí)同步整流驅(qū)動(dòng)器，是高效開(kāi)關(guān)電源（SMPS）解決方案。NCP4303具有閾值可調(diào)的精密的次級(jí)零電流檢測(cè)，工作模式包括CCM，DCM和QR反激拓?fù)?。工作電壓高達(dá)30V，具有5A/2.5A峰值沉/源驅(qū)動(dòng)能力，典型應(yīng)用包括筆記本電腦適配器，大功率密度的AC/DC電源，游戲機(jī)和所有高效開(kāi)關(guān)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(yīng)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(cè)電路框圖

圖3。NCP4303典型應(yīng)用案例：LLC轉(zhuǎn)換器