VNH2SP30-E datasheet(21/35 Pages) STMICROELECTRONICS

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VNH2SP30-E

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 32. Typical application circuit for DC to 20 kHz PWM operation short-circuit

protection

Note:

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

the voltage and current ripple on the supply line at PWM operation. Stored energy from 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 large enough. As a basic

guideline, 500 µF per 10 A load current is recommended.

In case of a fault condition, the DIAGX/ENX 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)

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 saturation detection.

When a fault condition is detected, the user can be informed of which power element is in

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

C

Reg 5V

+ 5V

HSA

HSB

LSA

LSB

VCC

DIAGA/ENA

INA

PWM

OUTA

OUTB

b) N MOSFET

3.3K

10K

33nF

1.5K

VCC

100K

DIAGB/ENB

+5V

3.3K

INB

GNDA

GNDB

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