[原创]Maxim MAX22256 36V H桥变压器驱动器解决方案

Maxim公司的MAX22256/8系列产品是紧凑的隔离电源36V H桥变压器驱动器,为超过15W的隔离电源提供简单的解决方案.这些器件从5V到36V DC电源驱动变压器初级线圈,电流高达650mARMS. MAX22256B/C最适合于LLC型谐振拓扑,改善了效率,降低开关噪音. MAX22256/MAX22258系列具有电阻可调整的电流限制,允许次级边负载电流间接限制,从而在次级或多或现场侧故障时保护初级电源. MAX22256/MAX22258集成了初级边控制器和H桥驱动器用兵于隔离电源电路,具有精密的板上振荡器,保护电路,其内部MOSFET向变压器初级绕组提供高达650mARMS电流.器件还具有内部450kHz(典型)振荡器,能由同步于多个器件的外部时钟来驱动和控制EMI.内部触发级保证了固定50%占空比,以保护变压器DC电流流动,只要时钟周期是不变的.电源电压5V到36V,效率高达91%.可编过流阈值,可调死区时间30ns到200ns(MAX22258),过流限制高达1A,工作温度-40°C到 +125°C.主要用在隔离马达驱动栅极电源和隔离+24V PLC现场电源.本文介绍了MAX22256/MAX22258产品亮点,框图和简化应用框图,多种应用电路图,以及评估板MAX22256 EVK主要特性,电路图,材料清单和PCB设计图.

The MAX22256/MAX22258 family provides a simple solution for making isolated power supplies over 15W. These devices drive a transformers primary coil with up to 650mARMS of current from a wide 5V to 36V DC supply. The MAX22256B/C are optimized for LLC-type resonant topology, improving efficiency, and reducing switching noise.

The MAX22256/MAX22258 family features a resistor-adjustable current limit that allows indirect limiting of the secondary-side load current and protects the primary power source in the event of secondary- or field-side failure.

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