VN750S-E 查看數據表（PDF） - STMicroelectronics

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VN750S-E

High-side driver

STMicroelectronics 

VN750-E / VN750S-E / VN750PT-E / VN750B5-E

OPEN LOAD DETECTION IN OFF STATE

Off state open load detection requires an external pull-up

resistor (RPU) connected between OUTPUT pin and a

positive supply voltage (VPU) like the +5V line used to

supply the microprocessor.

The external resistor has to be selected according to the

following requirements:

1) no false open load indication when load is connected:

in this case we have to avoid VOUT to be higher than

VOlmin; this results in the following condition

VOUT=(VPU/(RL+RPU))RL<VOlmin.

2) no misdetection when load is disconnected: in this

case the VOUT has to be higher than VOLmax; this

results in the following condition RPU<(VPU–VOLmax)/

IL(off2).

Because Is(OFF) may significantly increase if Vout is

pulled high (up to several mA), the pull-up resistor RPU

should be connected to a supply that is switched OFF

when the module is in standby.

The values of VOLmin, VOLmax and IL(off2) are available in

the Electrical Characteristics section.

Figure 9. Open Load detection in off state

INPUT

STATUS

V batt.

VPU

VCC

RPU

DRIVER

+

LOGIC

IL(off2)

+

R

-

OUT

VOL

RL

GROUND

10/31

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