Table 13. CurrentSense pin levels in off-state

Condition

Output

CurrentSense

FR_DIAG

Open-load

VOUT > VOL

Hi-Z

L

VSENSEH

H

VOUT < VOL

Hi-Z

L

0

H

Short to VCC

VOUT > VOL

Hi-Z

L

VSENSEH

H

Nominal

VOUT < VOL

Hi-Z

L

0

H

4.4.2

Short to VCC and OFF-state open-load detection

Short to VCC

A short circuit between VCC and output is indicated by the relevant current sense pin set to VSENSEH during the

device off-state. Small or no current is delivered by the current sense during the on-state depending on the nature

of the short circuit.

OFF-state open-load with external circuitry

Detection of an open-load in off mode requires an external pull-up resistor RPU connecting the output to a positive

supply voltage VPU.

It is preferable VPU to be switched off during the module standby mode in order to avoid the overall standby

current consumption to increase in normal conditions, i.e. when load is connected.

RPU must be selected in order to ensure VOUT > VOLmax in accordance with the following equation:

R

PU <

V

PU - 4

I

L(off2)min @ 4V

VN7004SLH

CS - analog current sense

DS13681 - Rev 2

page 22/35