Datasheet

DocID12688 Rev 9 19/33
VNH3SP30-E Application information
33
3 Application information
In normal operating conditions the DIAG
X
/EN
X
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 LS
A
and LS
B
switches.
When PWM rises back to “1”, LS
A
or LS
B
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 the 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 a basic
orientation, 500 µF per 10 A load current is recommended.
In case of a fault condition, the DIAG
X
/EN
X
pin is considered 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