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具有过流和过压关断功能的汽车类电池反向保护参考设计

消耗积分:0 | 格式:pdf | 大小:0.77 MB | 2017-05-04

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  PMP9498是一套完整的前端保护解决方案,适用于需要反向电压、过压或过流保护的汽车系统。它还实现了负载开关功能,能够以数字方式控制负载与输入电源的连接和断开。该设计可满足汽车应用在关闭期间的低智商要求,并且采用了强大的栅极电流源(典型值30 ma),可驱动大功率MOSFET,因此适合高电流应用。

具有过流和过压关断功能的汽车类电池反向保护参考设计

  The LM74160 smart diode solution is a floating solution with a charge pump to drive an external Nchannel MOSFET. The advantage of this is zero-Iq operation since there is no ground pin. In order to operate and charge the charge pump capacitor (C6), the MOSFET (Q1) must conduct through its body diode at a 1% duty cycle during forward conduction. Then, the MOSFET gate will be driven for 99% duty cycle, during which the current will flow through its RDS(ON) 。 This operation scheme allows for very efficient, diode-like operation, but without the continuous diode voltage drop.

具有过流和过压关断功能的汽车类电池反向保护参考设计

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