VND830MSP-E Application information
Doc ID 10903 Rev 4 19/28
1. No false open-load indication when load is connected:
in this case we have to avoid V
OUT
to be higher than V
Olmin
; this results in the following
condition V
OUT
=(V
PU
/(R
L
+R
PU
))R
L
<V
Olmin
.
2. No misdetection when load is disconnected:
in this case the V
OUT
has to be higher than V
OLmax
; this results in the following
condition R
PU
<(V
PU
–V
OLmax
)/I
L(off2)
.
Because I
s(OFF)
may significantly increase if V
OUT
is pulled high (up to several mA), the pull-
up resistor R
PU
should be connected to a supply that is switched OFF when the module is in
standby. The values of V
OLmin
, V
OLmax
and I
L(off2)
are available in Section 2.3: Electrical
characteristics.
Figure 25. Open-load detection in off-state
V
OL
V batt. V
PU
R
PU
R
L
R
DRIVER
+
LOGIC
+
-
INPUT
STATUS
V
CC
OUT
GROUND
I
L(off2)
