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X Series Data Sheet
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375, 500 Watt AC-DC and DC-DC DIN-Rail Converters
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.
Adjustment can be achieved via a resistor or an external
voltage source (in the range of 1.25 – 2.75 V).
Note : If the R input is not connected: V o or V o2 ≈ V o nom .
a) Adjustment by an external resistor:
V o = 50 – 100% V o nom . R ext1 ≈ 4 k ? ? –––––––––
Output voltage
V
5
3
05175b
Resistor R ext1 , connected between R (pin 2) and GND1 (pin
1) of the D-SUB connector or according to fig. 20.
V o
V o nom – V o
Resistor R ext2 , connected between R (pin 2) and VCC (pin 3)
of the D-SUB connector or according to fig. 17.
V o = 100 – 110% V o nom . R ext2 ≈ 4 k ? ? ––––––––––––––––
1
0
0.2
0.4
0.6
0.8
1
1.2
A
V o – 2.5 V
2.5 V?( V o / V o nom –1)
Output current
Fig. 23
Output voltage versus output current, while shut down (V i =
V i nom ).
Note: If the R function is not included in M1 or M2, refer to figure
20 how to connect R ext1 or R ext2 .
b) Adjustment by an external control voltage V ext (1.25 – 2.75
V), connected between R (pin 2) and GND (pin 1) of the D-
SUB connector or according to fig. 20.
V ext ≈ 2.5 V ? –––––
V o ≈ V o nom ? –––– ext
Table 19: Shutdown Conditions
Voltage V SD on Result
V o
V o nom
V
2.5 V
shutdown pin
< 0.7 V
≥ 2.0 V or open
Converter disabled ( P o approx. 1 W)
Converter enabled
Caution: To prevent damage, V ext should not exceed 3 V, nor be
negative.
Note: If longer wires are used to connect the R input at the D-SUB
connector, the wiring to pin 1 (GND1) should be done as a star
point connection. If wired differently, the output voltage setting
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
temperature sensor). The logic is shown in table 19.
The open-collector output Sys-OK is protected by a Zener
diode and withstands up to 58.6 V. When the system status is
OK, the signal output is low: V Sys-OK < 1.5 V, I Sys-OK < 50 mA.
R: Adjustment of V o or V o2
The R input allows external adjustment of the output voltage in
the range of 50% to 110% V o nom . Double-output models allow
only adjustment of output 2 (connected to the terminals 6, 7, 8,
and 9). This enables asymmetric output voltage configuration.
Table 20 : System OK (M1 with external battery sensor)
may be adversely affected.
In battery charging systems, an external battery temperature
sensor (see Accessories ) can be connected to optimize V o .
However, adjustment using the R input (pin 2 of D-SUB) is
possible as well. The above shown formulas are valid, but
V o nom stands for the voltage with open R input ( = V o safe ).
F: Built-in Second Fuse
A built-in second fuse in the neutral line provides safe phase-
to-phase connection at low mains voltages (e.g. USA 120 /
208 V /60 Hz systems).
The built-in second fuse also enables safe connection to the
mains, where phase and neutral are not defined or cannot be
identified, as e.g. in the case of plug and socket connection to
System Status
System OK
Battery overchared / temp. sensor
defect / control voltage to high
Overload, converter cannot follow the
control signal
Output does not follow control signal,
since battery would be overcharged
System OK
Input
O.K.
O.K.
O.K.
O.K.
O.K.
V control
sensor signal
2.7 V
2.7 V
2.7 V
3.0 V
2.5 V
V Bat
theoretical
27 V
27 V
27 V
30 V
25 V
V Bat
measured
27 V
28 V
24 V
27 V
25V
Sys-OK
output
Low ohmic
High ohmic
High ohmic
High ohmic
Low ohmic
BCD20021-G Rev AC1, 13-May-2013
Page 19 of 21
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