VNH3SP30-E datasheet(20/33 Pages) STMICROELECTRONICS

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Application information

VNH3SP30-E

20/33

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.

PWM pin usage: In all cases, a “0” on the PWM pin will turn off both LSA and LSB switches.

When PWM rises back to “1”, LSA or LSB turn on again depending on the input pin state.

Figure 33.

Typical application circuit for DC to 10 kHz PWM operation short circuit

protection

Note:

The value of the blocking capacitor (C) depends on the application conditions and defines voltage and

current ripple onto supply line at PWM operation. Stored energy of the motor inductance may fly back

into the blocking capacitor, if the bridge driver goes into tri-state. This causes a hazardous overvoltage

if the capacitor is not big enough. As basic orientation, 500µF per 10A 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 (saturation detection on the low side power

MOSFET)

µC

VNH3SP30-E Datasheet(PDF) 20 Page - STMicroelectronics