AN3328, Typical hot-swap controller circuit with addition of Q1 increases the gate-pulldown current, limiting the short-circuit current duration to less than 0.5ms

AN3328, Typical hot-swap controller circuit with addition of Q1 increases the gate-pulldown current, limiting the short-circuit current duration to less than 0.5ms. The short-circuit current duration can be limited to = 0.5ms by adding a Darlington pnp transistor (Q1) to speed the gate discharge. D1 allows the gate to charge normally at turn-on, but at turn-off the controller's 3mA gate-discharge current is directed to the base of Q1