Datasheet

Application information VNQ660SP
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3 Application information
Figure 23. Application schematic
Note: Channels 3 & 4 have the same internal circuit as channel 1 & 2.
3.1 GND protection network against reverse battery
This section provides two solutions for implementing a ground protection network against
reverse battery.
3.1.1 Solution 1: a resistor in the ground line (R
GND
only)
This can be used with any type of load.
The following show how to dimension the R
GND
resistor:
1. R
GND
≤ 600mV / 2 (I
S(on)max
)
2. R
GND
≥ ( - V
CC
) / ( - I
GND
)
where - I
GND
is the DC reverse ground pin current and can be found in the absolute
maximum rating section of the device datasheet.
Power dissipation in R
GND
(when V
CC
< 0 during reverse battery situations) is:
P
D
= ( - V
CC
)
2
/ R
GND
V
CC
D
ld
+5V
R
prot
STATUS
INPUT1
+5V
OUTPUT3
OUTPUT1
OUTPUT2
OUTPUT4
INPUT3
INPUT4
R
prot
R
prot
R
prot
R
prot
INPUT2
µ C
GND
D
GND
R
GND
V
GND
.