NS公司的SM72295是能驱动全桥连接的4个分立N沟MOSFET的驱动器,可提供峰值电流3A,并集成了电压高达115VDC高速自举二极管,电流检测可编程的2个跨导放大器来完成,并能去掉波纹电流为控制电路提供平均电流信息.主要用在微型逆变器,功率优化器,充电器和屏安全系统.本文介绍了SM72295主要特性, 功能方框图和典型应用电路图.

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

图1.SM72295功能方框图

图2.SM72295典型应用电路图
详情请见:
http://www.national.com/ds/SM/SM72295.pdf