
S Series Data Sheet
100 Watt AC-DC and DC-DC Converters
APR 26, 2006 revised to SEP 25, 2006
Page 13 of 33
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Programmable Output Voltage (R-Function)
As a standard feature, the converters offer an adjustable output
voltage, identified by letter R in the type designation. The control
input R (pin 16) accepts either a control voltage Vext or a
connected, the control input automatically sets the output
voltage to Vo nom.
a) Adjustment by means of an external control voltage Vext
between pin 16 (R) and pin 14:
The control voltage range is 0 - 2.75 VDC and allows an
output voltage adjustment in the range of approximately
0 - 110% Vo nom.
Vo
Vext = –––––– 2.5 V (approximate formula)
Vo nom
b) Adjustment by means of an external resistor:
Depending upon the value of the required output voltage the
resistor shall be connected
Either: Between pin 16 and pin 14 (Vo < Vo nom) to achieve
an output voltage adjustment range of approximately
0 - 100% Vo nom
or: Between pin 16 and pin 12 (Vo > Vo nom) to achieve an
output voltage adjustment range of approximately 100 - 110%
Vo nom.
Warning:
– Vext shall never exceed 2.75 VDC.
– The value of R'ext shall never be less than the lowest value
as indicated in table R'ext for (Vo > Vo nom)
Notes:
– The R-Function excludes option P (output voltage adjustment by
potentiometer).
– If the output voltages are increased above Vo nom via R-input
control, option P setting, remote sensing or option T, the output
current(s) should be reduced accordingly so that Po nom is not
exceeded.
– With double-output models the second output follows the value of
the controlled main output.
– In case of parallel connection the output voltages should be
individually set within a tolerance of 1 - 2%.
Fig. 16
Output voltage control for single-output models AS - LS1000.
R
Vo1+
Vo1–
S–
Vext
Vi+
Vi–
Rext
R'ext
14
16
14
+
S+
Vo1+
Vo1–
S–
Vi+
Vi–
R
12
05074_050905
Table 7a: Rext for Vo < Vo nom; approximative values (Vi nom, Io nom, series E 96 resistors); R'ext = not fitted
Vo nom = 5.1 V
Vo nom = 12 V
Vo nom = 15 V
Vo nom = 24 V
Vo [V]
Rext [kΩ
Ω]
Vo [V]
1
Rext [kΩ
Ω]
Vo [V]
1
Rext [kΩ
Ω]
Vo [V]
1
Rext [kΩ
Ω]
0.5
0.432
2
4
0.806
2
4
0.619
4
8
0.806
1.0
0.976
3
6
1.33
4
8
1.47
6
12
1.33
1.5
1.65
4
8
2
6
12
2.67
8
16
2
2.0
2.61
5
10
2.87
8
16
4.53
20
2.87
2.5
3.83
6
12
4.02
9
18
6.04
12
24
4.02
3.0
5.76
7
14
5.62
10
20
8.06
14
28
5.62
3.5
8.66
8
16
8.06
11
22
11
16
32
8.06
4.0
14.7
9
18
12.1
12
24
16.2
18
36
12.1
4.5
30.1
10
20
13
26
26.1
20
40
20
5.0
200
11
22
42.2
14
28
56.2
22
44
44.2
1 First column: Vo or Vo1, second column: outputs of double-output models in series connection