Datasheet

VN5772AK-E Application information
Doc ID 16084 Rev 6 21/34
3 Application information
Figure 26. Typical application schematic
Mostly motor bridge drivers use a reverse battery protection diode (D) inside supply rail.
This diode prevents a reverse current flow back to Vbatt in case the bridge gets disabled via
the logic inputs while motor inductance still carries energy. In order to prevent a hazardous
overvoltage at circuit supply terminal (V
CC
), a blocking capacitor (C) is needed to limit the
voltage overshoot. As basic orientation, 50 µF per 1 A load current is recommended. In
alternative, also a Zener protection (Z) is suitable.
Even if a reverse polarity diode is not present, it is recommended to use a capacitor or zener
at V
CC
because a similar problem appears in case supply terminal of the module has
intermittent electrical contact to the battery or gets disconnected while motor is operating.