簡述：

對于電源而言，既要充分利用電能，又要盡可能地減少不必要的電能損耗。NCP4330內置一個雙MOSFET驅動器，用于采用同步整流的交流－直流

或直流－直流多輸出后穩壓電源中的輔助芯片。直接由次級交流信號供電，

器件將功耗保持最低，同時減少了周圍零件數量。

主要特征：

The NCP4330 houses a dual MOSFET driver intended to be used as a companion chip in AC−DC or DC−DC multi−output post regulated power supplies. Being directly fed by the secondary AC signal, the device keeps power dissipation to the lowest while reducing the surrounding part count. Furthermore, the implementation of a N−channel MOSFET gives NCP4330−based applications a significant advantage in terms of efficiency.

Undervoltage Lockout

•Thermal Shutdown for Overtemperature Protection

•PWM Operation Synchronized to the Converter Frequency

•High Gate Drive Capability

•Bootstrap for NMOSFET HighSide Drive

•OverLap Management for Soft Switching

•Ideal for Frequencies up to 400 kHz



          圖1   NCP4430 框圖

方案特點：

The evaluation board is designed to speed up evaluationof NCP4330 based post regulator SMPS applicationstogether with external traditionally regulated main forwardsupply. NCP4330 Evaluation board is built on one copper layerPCB using mixed (through hole and SMT) mountingtechnology. Large copper areas are used when needed forminimizing parasitic inductances and cooling the surfacemounted power devices (NTMS4700N power FETs,NCP4330 IC and inductor).

參考原理圖：



圖2  參考原理圖1



圖3  參考原理圖2

參考PCB圖：



圖4    PCB bottom





圖5 pcb元件圖

詳情請見：

http://www.onsemi.cn/pub_link/Collateral/NCP4330EVB-D.PDF