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VNQ5E160K-E Datasheet(PDF) 24 Page - STMicroelectronics

Part # VNQ5E160K-E
Description  Quad channel high side driver for automotive applications
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

VNQ5E160K-E Datasheet(HTML) 24 Page - STMicroelectronics

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3.4
Open load detection in Off state
Off-state open load detection requires an external pull-up resistor (RPU) connected between
the 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 the 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 33.
Open load detection in Off state
VOL
V batt.
VPU
RPU
RL
R
DRIVER
+
LOGIC
+
-
INPUT
STATUS
VCC
OUT
GROUND
IL(off2)


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