VN751PT_08 STMICROELECTRONICS [STMicroelectronics], VN751PT_08 Datasheet - Page 11

• Manufacturer Part Number: VN751PT_08
• Description: High side driver
• Manufacturer: STMICROELECTRONICS [STMicroelectronics]

7
VN751PT
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.
The power dissipation associated to R
PD = (-V
This resistor can be shared by several different ICs. In such case I
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
voltage drop across the R
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
same R
Figure 9.
R
R
GND
GND
GND
CC
≤
≥
)
.
2
Reverse polarity protection
600 mV / (I
(-V
/R
GND
CC
) / (-I
GND
S
in ON state max).
GND
)
(given by I
Status
Status
Input
Input
(Optional)
(Optional)
i
i
i
i
R
R
GNG
GND
GND
S
+ Vcc
+ Vcc
in ON state max * R
during reverse polarity condition is:
GND
GND
Output
Output
i
i
Load
Load
GND
Reverse polarity protection
S
) produce a difference
value on formula (1) is the
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