DocID024832 Rev 1

15/24

L6491

Smart shutdown function

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Smart shutdown function

The L6491 device integrates a comparator committed to the fault sensing function. The

comparator input can be connected to an external shunt resistor in order to implement

a simple overcurrent detection function.

The output signal of the comparator is fed to an integrated MOSFET with the open-drain

output available on pin 2, shared with the SD input. When the comparator triggers, the

device is set in shutdown state and both its outputs are set to low level leaving the half-

bridge in 3-state.

Figure 6. Smart shutdown timing waveforms