Pololu Dual VNH5019 User Manual download pdf (Page 18)

Power Considerations

Dual VNH5019 motor driver shield power buses when not used with

an Arduino shield.

The shield must be supplied with 5.5 to 24 V through the large VIN and GND pads on the right side of the

board. A high-side reverse-voltage protection MOSFET prevents the shield from being damaged if shield power is

inadvertently connected backwards.

Note that the motor driver features over-voltage protection that can kick it at voltages as low as 24 V,

so we do not recommend using it with 24 V batteries (such batteries can significantly exceed 24 V

when fully charged).

It is important that you use a power source that is capable of delivering the current your motors will require. For

example, alkaline cells are typically poor choices for high-current applications, and you should almost never use a 9V

battery (the rectangular type with both terminals on the same side) as your motor power supply.

Logic power at the same level as your controlling device should be supplied to the VDD pin. This will typically be

between 2.5 and 5 V, but the VNH5019 motor drivers are guaranteed to treat any logic input voltage over 2.1 V as

high. The only purpose of the VDD pin is to power the pull-up resistors on the EN/DIAG lines.

Motor Considerations

The motor considerations are the same as those detailed in Section 3.c.

4. Using as a General-Purpose Motor Driver Page 18 of 28

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Pololu Dual VNH5019 User Manual Page 18