Application information

VNQ830

18/28

Doc ID 7390 Rev 5

3

Application information

Figure 24.

Application schematic

Note:

Channels 3 and 4 have the same internal circuit as channel 1 and 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 (RGND only)

This can be used with any type of load.

The following show how to dimension the RGND resistor:

1.

RGND ≤ 600 mV / 2(IS(on)max)

2.

RGND ≥(-VCC) / (-IGND)

VCC1,2

OUTPUT2

+5V

Rprot

OUTPUT1

STATUS1

INPUT1

+5V

STATUS2

INPUT2

+5V

DGND

RGND

VGND

GND1,2

GND3,4

OUTPUT3

OUTPUT4

μC

VCC3,4

STATUS3

INPUT3

STATUS4

INPUT4

+5V

+5V

Rprot

Rprot

Rprot

Rprot

Rprot

Rprot

Rprot

Dld

Obsolete

Product(s)

- Obsolete

Product(s)