LM5060做应用的时候,发现Timer脚的电容容值放到2.2nF的时候上电直接就保护了,测试timer脚电压稳定在5.5V,输出不接负载也是一样,想问下,Timer脚的电容容值有取值范围限制吗?或者上面这个现象是什么原因引起的?
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你的问题的原因就在Timer脚本身的功能定义上:
Timer脚的充电电流能力在启动时是6uA的典型值,所以你根据这个情况取舍电容值,容值越大越延迟触发, T=C*U/I
Timing capacitor: an external capacitor connected to this pin sets the VDS fault detection delay time. If the TIMER pin exceeds the 2.0-V threshold condition, the LM5060 will latch off the MOSFET and remain off until either the EN, UVLO or VIN (POR) input is toggled low and then high.