Smart shutdown function STGIPN3H60-E
14/22 DocID027271 Rev 1
4 Smart shutdown function
The STGIPN3H60-E integrates a comparator for fault sensing purposes. The comparator
non-inverting input (CIN) can be connected to an external shunt resistor in order to
implement a simple overcurrent protection function. When the comparator triggers, the
device is set in shutdown state and both its outputs are set to low-level leading the half
bridge in 3-state. In the common overcurrent protection architectures the comparator output
is usually connected to the shutdown input through a RC network, in order to provide a
mono-stable circuit, which implements a protection time that follows the fault condition. Our
smart shutdown architecture allows to immediately turn-off the output gate driver 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 outputs turn-off is no more dependent on the RC
values of the external network connected to the shutdown pin. At the same time the internal
logic turns on the open-drain output and holds it on until the shutdown voltage goes below
the logic input lower threshold. Finally the smart shutdown function provides the possibility
to increase the real disable time without increasing the constant time of the external RC
network.
