VN751S

Reverse polarity protection

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Reverse polarity protection

A schematic solution to protect the IC against a reverse polarity condition is proposed.

This schematic is effective with any type of load connected to the outputs of the IC.

The RGND resistor value can be selected according to the following conditions to be met:

1.

2.

where -IGND is the DC reverse ground pin current and can be found in the absolute maximum

rating section of the device datasheet.

GND

sum of the maximum ON-state currents of the different devices.

Please note that if the microprocessor ground and the device ground are separated then the

between the generated input level and the IC input signal level. This voltage drop will vary

depending on how many devices are ON in the case of several high side switches sharing the

Figure 9.

Reverse polarity protection

Status

i

Input

i

GND

Output

i

+ Vcc

R

GND

(Optional)

Load

Status

i

Input

i

GND

Output

i

+ Vcc

R

GND

(Optional)

Load