VN808CM-E 查看數據表（PDF） - STMicroelectronics

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VN808CM-E

Octal channel high side driver

STMicroelectronics 

Reverse polarity protection

6

Reverse polarity protection

VN808CM-E

Note:

This schematic can be used with any type of load.

The following is an indication on how to dimension the RGND resistor.

RGND = (-VCC) / (-IGND)

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

maximum rating section of the device datasheet.

Power dissipation in RGND (when VCC< 0: during reverse polarity situations) is:

PD = (-VCC)2/RGND

In normal condition (no reverse polarity) due to the diode there will be a voltage drop

between GND of the device and GND of the system.

Figure 7. Reverse polarity protection

+ Vcc

Status

Inputi

RGND

GND

Outputi

Diode

Load

12/21

Doc ID 11456 Rev 8

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