Analogictech AAT4910大电流双MOSFET驱动方案

Analogictech 公司的AAT4910是28V半桥双MOSFET驱动器,它采用逻辑输入控制,能驱动高边和低边N沟MOSFET.输入电压可高达28V,具有超温和穿通保护,可用在D类音频放大器,大电流同步DC/DC转换器,马达驱动器和多相DC/DC转换器.本文介绍了AAT4910的主要特性, 方框图, 典型应用电路与2相同步降压转换器功率级电路,以及采用AAT4910的典型D类放大器框图和评估板电路图.

The AAT4910 is a 28V half-bridge dual MOSFET driver for high-current DC-DC converter and motor driver applications. It drives both high-side and low-side N-channel MOSFET switches controlled by a logic input. The internal driver circuitry and MOSFET driver power comes from a 5V input allowing the use of low-threshold MOSFETs. The high-side driver output stage is allowed to float at up to 28V, allowing a broad range of power sources.

The AAT4910 is available in a Pb-free, space-saving SC70JW-8 package and is rated over the -40°C to 85°C temperature range.

AAT4910主要特性:
Input Voltage Range up to 28V
Dual N-Channel MOSFET Switches
Shoot-Through Protection
Over-Temperature Protection
Available in 2.0 x 2.1 mm SC70JW-8 Package
-40°C to 85°C Temperature Range

AAT4910应用:
Class D Audio
High Current Synchronous DC-DC Converter
Motor Drivers
Multiphase DC-DC Converters



图1. AAT4910方框图



图2.AAT4910典型应用电路



图3.AAT4910 2相同步降压转换器功率级电路



图4.采用AAT4910的典型D类放大器框图



图5.AAT4910评估板电路图