Smart High-Side Power Switch

BTS5231-2GS

Diagnosis

Data Sheet

21

V1.2, 2008-09-01

Figure 16

Timing of Diagnosis Signal in Over Load Condition

4.3.2

OFF-State Diagnosis

Details about timings between the diagnosis signal

I

load current

I

state an external output pull-up resistor (

R

Figure 17

Timing of Diagnosis Signal in OFF-State

For calculation of the pull-up resistor, just the external leakage current

I

open load threshold voltage

V

(4)

I

There is no internal leakage current from out to ground at BTS5231-2GS.

V

minimum supply voltage at which the open load diagnosis in off state must be ensured.

To reduce the stand-by current of the system, an open load resistor switch (

S

recommended.

OverLoad.emf

IN

t

t

ON

t

sIS(OVL)

OFF

over temperature

over load (current limitation)

OFF

SwitchOff.emf

IN

I

IS

t

t

t

Open Load, pull-up resistor active

ON

OFF

pull-up resistor

inactive

–

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=