Application information

VNH5200AS-E

18/31

DocID023424 Rev 9

3

Application information

In normal operating conditions the DIAGX/ENX pin is considered as an input pin by the

device. This pin must be externally pulled high.

Figure 9. Typical application circuit

Note:

The value of the blocking capacitor (C) depends on the application conditions. Stored

energy of the motor inductance may fly back into the blocking capacitor, if the bridge driver

goes into 3-state. This causes a hazardous overvoltage if the capacitor is not big enough.

As basic orientation, 500 µF per 10 A load current is recommended.

In case of a fault condition the DIAGX/ENX pin is considered as an output pin by the device.

The fault conditions are:

•

Overtemperature on one or both high-sides

•

Short to battery condition on the output (overcurrent detection on the low-side Power

MOSFET)

Possible origins of fault conditions may be:

OUTA is shorted to ground

→ overtemperature detection on high-side A

OUTA is shorted to VCC

→ low-side Power MOSFET overcurrent detection

When a fault condition is detected, the user can identify which power element is in fault by

monitoring the INA, INB, DIAGA/ENA and DIAGB/ENB pins.

In any case, when a fault is detected, the faulty leg of the bridge is latched off. To turn on the

respective output (OUTX) again, the input signal must rise from low to high level.