DocID029059 Rev 1

15/23

STGIPL30C60

Smart shutdown function

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Smart shutdown function

The STGIPL30C60 integrates a comparator for fault sensing purposes. The comparator has

an internal voltage reference VREF connected to the inverting input, while the non-inverting

input, available on pin (CIN), can be connected to an external shunt resistor in order to

implement the overcurrent protection function. When the comparator triggers, the device is

set in shutdown state and both of its outputs are set to low level leading the half-bridge to tri-

state. In the common overcurrent protection architectures the comparator output is usually

connected to the shutdown input through an RC network, in order to provide a mono-stable

circuit, which implements protection time that follows the fault condition. Our smart

shutdown architecture allows the output gate driver to be immediately turned off in case of

overcurrent, the fault signal has a preferential path which directly switches off the outputs.

The time delay between the fault and the output turn-off is no more dependent of RC values

of the external network connected to the shutdown pin. At the same time the DMOS

connected to the open drain output (pin SD/OD) is turned on by the internal logic which

holds it on until the shutdown voltage is lower than the lowest logic input threshold (Vil).

Finally, the smart shutdown function provides the possibility to increase the real disable time

without increasing the constant time of the external RC network.