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W Series Data Sheet
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D1: Output Voltage Monitor
125, 250 Watt AC-DC and DC-DC DIN-Rail Converters
D-SUB (female)
D1 is intended for monitoring the bus voltage of a battery-
buffered system. It indicates that the system is powered from
the battery and can for instance be used as a warning signal or
to switch off a part of the load. When the output voltage V o (or
9
5 4 3 2 1
8 7 6
V o2 ) is greater than V o low D1 specified in table 17, the D1 signal
output is conducting: V D1 < 1.5 V, I D1 max < 50 mA.
VCC
GND1
When V o is lower, the D1 signal output is high impedance
(open-collector, max. 58.6 V). In double-output models, D1
monitors only output 2 ( V o2 ).
In applications without battery-buffering the D1 signal may not
be suitable, since smaller dynamic load changes may cause
D1 to trigger. For such applications, D5 with a trigger level of
approx. 85% of V o nom should be chosen (e.g., for a bus voltage
of 24.7 V: trigger level at 21 V).
D5: System Voltage Monitor (Battery Deep)
D5 monitors the output voltage V o ( V o2 in double-output
models) or the lowest admissible voltage of a connected
R x R y
Change threshold
Fig. 22
Wiring to adjust both threshold levels of option D1 or D5
SD: Shutdown
Reduces the output power to approx. 1 W, but the converter is
not fully disabled. In a no-load condition, V o drops below 6.2 V;
see fig. 23. In double-output models, only output 2 is
influenced.
battery (battery deep discharge). The definition of D5 is similar
to D1, but the trigger level is lower. When V o (or V o2 ) is greater
than V o low D5 specified in table 17, the D2 signal output is
conducting:
V D5 < 1.5 V, I D5 max < 50 mA.
When V o is lower, the D5 signal output is high impedance
(open-collector, max. 58.6 V). In double-output models, D5
monitors only output 2 ( V o2 ).
Output voltage
V
5
3
1
05175b
In systems without battery support, D5 signals that V o (or V o2 )
is going to drop below a safe value.
0
0.2
0.4
0.6 0.8
Output current
1
1.2
A
In battery-buffered systems, D5 indicates that the battery has
reached its deepest discharge level prior to getting damaged.
The D5 signal can be used for instance to disable loads, save
data, or to start a controlled switch-off of running processes.
Table 17: Options D1 and D5: Trigger and switch-on levels
Fig. 23
Output voltage versus output current, while the shutdown is
activated (V i = V i nom ).
Table 18: Shutdown conditions
Model
Battery
V Bat
[ V]
V o low D1 V o low D 5
trigger switch on trigger switch on
[ V] [ V] [ V] [ V]
Voltage V SD on
shutdown pin
< 0.7 V
Result
Converter disabled ( P o approx. 1 W)
LWR/LWN1140
LWR/LWN1240
12
24
11.5
23
12.1
24.2
10.5
21
12.1
24.2
≥ 2.0 V or open
Converter enabled
LWR/LWN1840
LWR/LWN1740
36
48
34.4
46
36.3
48.4
31.5
42
36.3
48.4
Sys-OK: Status
This function allows in a battery charger application for
checking, whether the output is correctly following the external
control signal at the R-input (coming for instance from the
Adjustment of Threshold Levels (D1/D5)
Pin 7 of the D-SUB connector allows for adjustment of the
threshold levels of D1 and D5. Both levels are influenced by
the voltage divider R x / R y. Resistor R x to pin 3 (VCC) lowers
the levels, whereas R y to pin 1 (GND1) increases them (see
fig. 22).
temperature sensor). The logic is shown in table 19.
BCD20020-G Rev AC, 31-Jan-2013
Page 22 of 25
www.power-one.com
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