PROTECTION CIRCUITS

DUAL HIGH SIDE SWITCH

The simplest way to protect the device against a

continuous reverse battery voltage (-26V) is to

insert a a small resistor between pin 2 (GND) and

ground. The suggested resistance value is about

150

Ω. In any case the maximum voltage drop on

this resistor should not overcome 0.5V.

If there is no need for the control unit to handle

external analog signals referred to the power

GND, the best approach is to connect the

reference potential of the control unit to the

device ground (see application circuit in fig. 3),

which becomes the common signal GND for the

TRUTH TABLE (for Dual high-side switch only)

I NPUT 1

INPUT 2

SO URCE 1 SOURCE 2

DIAG NO STI C

Normal Operation

L

H

L

H

L

H

H

L

L

H

L

H

L

H

H

L

H

H

H

H

Under-voltage

X

X

L

L

H

T hermal Shut down

Channel 1

HX

L

X

L

Channel 2

XH

X

L

L

O pen Load

Channel 1

H

L

X

L

H

L

X

L

L

L

Channel 2

X

L

H

L

X

L

H

L

L

L

Channel 1

H

L

X

L

H

H

X

L

L

L

Channel 2

X

L

H

L

X

L

H

H

L

L

NOTE: The low-side switches have the fault feedback which can be detected by monitoring the voltage at the input pins.

L = Logic LOW, H = Logic HIGH, X = Don’t care

ABSOLUTE MAXIMUM RATING (-40

HIGH SIDE SWITCH

Symb ol

Parameter

Value

Uni t

Drain-Source Brekdown Voltage

40

V

Output Current (continuous)

14

A

Reverse O utput Current

-14

A

Input Current

±10

mA

Reverse Supply Current

-4

V

St atus Current

±10

mA

Elect rostatic Discharge (C = 100 pF, R = 1. 5 K

Ω)

2000

V

Int ernally Limited

W

Junct ion Operat ing Temperature

-40 to 150

St orage Temperature

-55 to 150

VN771

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