K Series Data Sheet
150 Watt DC-DC and AC-DC Converters
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
V
ext or a
resistor
R
ext to adjust the desired output voltage. When not
connected, the control input automatically sets the output
voltage to
V
o nom.
a) Adjustment by means of an external control voltage
V
ext
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%
V
o nom.
o
Vext
= –––––– • 2.5 V (approximate formula)
V
o nom
Notes:
– The R-Function excludes option P (output voltage adjustment by
potentiometer).
– If the output voltages are increased above
V
o nom via R-input
control, option P setting, remote sensing or option T, the output
current(s) should be reduced accordingly so that
P
o 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%.
V
Vi+
16
Vo1+
R
S–
Vo1–
05074_050905
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 <
V
o nom) to achieve
an output voltage adjustment range of approximately
0 - 100%
V
o nom
or:
Between pin 16 and pin 12 (Vo >
V
o nom) to achieve an
output voltage adjustment range of approximately 100 - 110%
V
o nom.
Warning:
–
V
ext 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 >
V
o nom)
Vi–
Vi–
+
V
ext
14
Vi+
12
16
14
Vo1+
S+
R
S–
Vo1–
R'
ext
R
ext
Fig. 16
Output voltage control for single-output models
AK - LK1000 by means of the R input
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
Ω
Vo
[V]
Rext
[kΩ]
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
4.5
5.0
1
Vo
nom = 12 V
Ω
Vo
[V]
1
Rext
[kΩ]
2
3
4
5
6
7
8
9
10
11
4
6
8
10
12
14
16
18
20
22
0.806
1.33
2
2.87
4.02
5.62
8.06
12.1
20
42.2
2
4
6
8
9
10
11
12
13
14
Vo
nom = 15 V
Ω
Vo
[V]
1
Rext
[kΩ]
4
8
12
16
18
20
22
24
26
28
0.619
1.47
2.67
4.53
6.04
8.06
11
16.2
26.1
56.2
4
6
8
10
12
14
16
18
20
22
Vo
nom = 24 V
Ω
Vo
[V]
1
Rext
[kΩ]
8
12
16
20
24
28
32
36
40
44
0.806
1.33
2
2.87
4.02
5.62
8.06
12.1
20
44.2
0.432
0.976
1.65
2.61
3.83
5.76
8.66
14.7
30.1
200
First column: single-output models or double-output models with separated outputs, second column: outputs in series connection
APR 26, 2006 revised to MAY 15, 2006
Page 13 of 34
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