VNI8200XP View Datasheet(PDF) - STMicroelectronics

Part Name

Description

Manufacturer

VNI8200XP

Octal high-side smart power solid-state relay with serial/parallel selectable interface on-chip

STMicroelectronics 

VNI8200XP

Reverse polarity protection

6

Reverse polarity protection

Reverse polarity protection can be implemented on board using two different solutions:

1. Placing a resistor (RGND) between IC GND pin and load GND

2. Placing a diode between IC GND pin and load GND

If option 1 is selected, the minimum resistance value has to be selected according to the

following equation:

RGND ≥ VCC / IGND

where IGND is the DC reverse ground pin current and can be found in of this datasheet.

Power dissipated by RGND (when VCC < 0: during reverse polarity situations) is:

PD = (VCC)2/RGND

If option 2 is selected, the diode has to be chosen by taking into account VRRM >|VCC| and

its power dissipation capability:

PD ≥ IS*VF

In normal conditions (no reverse polarity), due to the diode, there is a voltage drop

between GND of the device and GND of the system.

Figure 3: Reverse polarity protection

This schematic can be used with any type of load.

DocID15234 Rev 9

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