VNI8200XP-32 datasheet(17/43 Pages) STMICROELECTRONICS

Part #	VNI8200XP-32

Description	Octal high-side smart power solid-state relay with serial

PDF	43 Pages

Scroll/Zoom	100%

Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

Logo

17 / 43 page

VNI8200XP-32

Reverse polarity protection

DocID027849 Rev 3

17/43

Reverse polarity protection

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

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

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 Section 4: "Maximum

ratings" of this datasheet.

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

PD = (VCC)

2/R

GND

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.

VNI8200XP-32 Datasheet(PDF) 17 Page - STMicroelectronics