VNH3SP30-E

Application information

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Possible origins of fault conditions may be:

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

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

3.1

Reverse battery protection

Three possible solutions can be considered:

1.

2.

an N-channel MOSFET connected to the GND pin (see Figure 33: Typical application

circuit for DC to 10 kHz PWM operation short circuit protection on page 20

3.

The device sustains no more than -30A in reverse battery conditions because of the two

body diodes of the power MOSFETs. Additionally, in reverse battery condition the I/Os of

maximum target reverse current through µC I/Os, the series resistor is:

3.2

Open load detection in Off mode

It is possible for the microcontroller to detect an open load condition by adding a simply

resistor (for example, 10k ohm) between one of the outputs of the bridge (for example,

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an open load fault.

a.

An internal operational amplifier compares the Drain-Source MOSFET voltage with the internal reference (2.7V

Typ.). The relevant low side power MOS is switched off when its Drain-Source voltage exceeds the reference

voltage.

R

V

IOs

V

CC

–

I

Rmax

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