•

GHSx output is high and (VS - VOUTx) > VDSth for more than tDFSC

Important:

The VDS monitoring is implemented assuming that the supply of the power stage (VM) is at the same voltage of the

STDRIVE101 supply (VS). Supplying the power stage with a voltage VM lower than VS the VDS monitoring protection

could not work properly. In particular, if the voltage difference 'VS - VM' is greater than VDSth, the protection will be

triggered each time the high-side is turned on, regardless of the current flowing in the MOSFET.

For this reason it is recommended, when using the VDS monitoring protection to supply the STDRIVE101 (VS) and the

power stage (VM) at the same voltage. In case it is required to use a VM voltage lower than VS, the VDS monitoring

protection must be disabled setting the SCREF pin above the VSCREF,dis voltage.

As soon as the protection is triggered, all the gate drivers outputs are forced low, the nFAULT output is forced low

and the protection is latched. In this condition all the gate driver outputs are kept low whatever the driving inputs

(refer to Figure 6).

The protection is released only when the device enters standby mode.

Note:

SCREF pins structure does not allow a bias without VS supply voltage.

5.7

Overcurrent comparator

The STDRIVE101 embeds a comparator suitable for overcurrent detection of the power stage through a shunt

resistor.

When the input voltage at CP pin is higher than internal reference voltage (VREF), the device enters into a

protection state: all the gate driver outputs are forced low and the nFAULT open drain output is forced low. The

device automatically leaves the protection state after a tDISABLE time (refer to Figure 5 for details).

5.8

Thermal protection

The device embeds an overtemperature shutdown protection through thermal sensor placed next to the linear

regulator block.

When the overtemperature protection occurs, the linear regulator is switched off and the nFAULT output is forced

low. The thermal shutdown condition expires when the temperature goes below the “TSD- TSDhys” temperature

(auto-restart).

Figure 19. Thermal shutdown management

V

nFAULT

T

j

T

jSD

Thermal

shutdown

T

jSD,hyst

Power

stage

ENABLED

ENABLED

DISABLED

STDRIVE101

Overcurrent comparator

DS13472 - Rev 1

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