VNQ860-E_08 STMICROELECTRONICS [STMicroelectronics], VNQ860-E_08 Datasheet - Page 11

• Manufacturer Part Number: VNQ860-E_08
• Description: Quad channel high side driver
• Manufacturer: STMICROELECTRONICS [STMicroelectronics]

VNQ860-E, VNQ860SP-E
8
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
the 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
CC
≤
≥
)
GND
2
Reverse polarity protection
600 mV / (I
(-V
/R
GND
.
CC
) / (-I
GND
S
in ON state max).
GND
)
Status
Status
(given by I
Input
Input
(Optional)
(Optional)
i
i
i
i
R
R
GND
GND
GNG
S
+ Vcc
+ Vcc
in ON state max * R
during reverse polarity condition is:
GND
GND
Output
Output
i
i
Load
Load
Reverse polarity protection
GND
S
) produce a difference
value on formula (1) is
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