When fuse F 1 is in good order, diode D 1 is forward-biased, but its forward voltage is insufficient to bias forward-flashing diode D 2 and the Q 1 ’s base-emitter junction. The self-driven HCM1206X ...

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An e-fuse may also provide fixed or adjustable OVP, adjustable fault time and/or current limit, indicator lights for such conditions as Fault, PG (Power good), and more, control of turn on slew rate, ...