NS公司的SM72295是能驅(qū)動全橋連接的4個分立N溝MOSFET的驅(qū)動器,可提供峰值電流3A,并集成了電壓高達(dá)115VDC高速自舉二極管,電流檢測可編程的2個跨導(dǎo)放大器來完成,并能去掉波紋電流為控制電路提供平均電流信息.主要用在微型逆變器,功率優(yōu)化器,充電器和屏安全系統(tǒng).本文介紹了SM72295主要特性, 功能方框圖和典型應(yīng)用電路圖.

The SM72295 is designed to drive 4 discrete N type MOSFET’s in a full bridge configuration. The drivers provide 3A of peak current for fast efficient switching and integrated high speed bootstrap diodes. Current sensing is provided by 2 transconductance amplifiers with externally programmable gain and filtering to remove ripple current to provide average current information to the control circuit. The current sense amplifiers have buffered outputs available to provide a low impedance interface to an A/D converter if needed. An externally programmable input over voltage comparator is also included to shutdown all outputs. Under voltage lockout with a PGOOD indicator prevents the drivers from operating if VCC is too low.

SM72295主要特性:

■ Renewable Energy Grade

■ Dual Half Bridge MOSFET Drivers

■ Integrated 100V bootstrap diodes

■ Independent High and Low driver logic inputs

■ Bootstrap supply voltage range up to 115V DC

■ Two current sense amplifiers with externally programmable gain and buffered outputs

■ Programmable over voltage protection

■ Supply rail under-voltage lockouts with power good Indicator

圖1.SM72295功能方框圖

圖2.SM72295典型應(yīng)用電路圖
詳情請見:
http://www.national.com/ds/SM/SM72295.pdf