¡
Use wide PCB patterns or thick wires between the power module
and the load. Line drop should be kept less than 0.3V. Make sure
output voltage from the power module stays within the specifi ed
range.
¡
If the sensing patterns are shorted by mistake, a large current may
fl ow and damage the pattern. This can be prevented by installing
fuses or resistors close to the load.
As wiring or load impedance may generate oscillation or large
fluctuations in output voltage, make sure enough evaluation is
given in advance.
4.6 Adjustable voltage range
¡
Output voltage bVOUT and -VOUT can be adjusted by
connecting external resistors to TRM.
¡
When the output voltage adjustment is not used, open the TRM
pin respectively.
¡
When the output voltage adjustment is used, note that the over-
voltage protection circuit operates when the output voltage sets
too high.
¡
The wiring to the potentiometer should be as short as possible.
As the ambient temperature fl uctuation characteristics deteriorates
depending on the types of resistors and potentiometers used,
please use resistors and potentiometers of the following specifi ca-
tions:
Resistors ............. Metal fi lm type, coeffi cient less than ±100ppm/
C
Potentiometers ... Cermet type, coeffi cient less than ±300ppm/
C
¡
When the input voltage is 60 - 66VDC or 200 - 250VDC, the out-
put voltage adjustment range becomes as shown in fi g . 4.4.
¿
DHS50, DHS100
¡
To increase the output voltage, turn the potentiometer clockwise
and connect in such a way that the resistance value between
2
and
3
becomes small.
To decrease the output voltage, turn the potentiometer counter-
clockwise.
¿
DHS200, DHS250
(1) Output voltage adjusting
¡
Output voltage can be adjusted by connecting an external potenti-
ometer (VR1) and resistors (R1 and R2) as shown in Fig. 4.6.
Output voltage will increase if the resistance between
1
and
2
is
reduced by turning the potentiometer clockwise.
Recommended values for external components are shown in
Table 4.3.
Consult us if the power module is used in a different confi guration.
No.
Output
Voltage
Adjustable Range
VOUT±5%
VOUT±10%
R1
R2
R1
R2
1
3.3V
2.4k
W
12k
W
2.4k
W
8.2k
W
2
5V
5.6k
W
5.6k
W
3
7.5V
10k
W
10k
W
4
12V
18k
W
18k
W
5
15V
24k
W
24k
W
6
24V
43k
W
43k
W
7
28V
47k
W
47k
W
8
48V
91k
W
91k
W
Table 4.2 Recommended Values of External Resistors (DHS50, DHS100)
No.
Output
Voltage
Adjustable Range
VOUT±5%
VOUT±10%
R1
R2
R1
R2
1
3.3V
5.1k
W
3.3k
W
3.3k
W
2.2k
W
2
5V
12k
W
8.2k
W
3
12V
15k
W
10k
W
4
15V
22k
W
15k
W
5
24V
39k
W
27k
W
6
28V
47k
W
33k
W
60
100
110
120
66
0
0
60
5V
Others
60
110
120
66
0
0
90
5V
Others
DC-DC Converters Bus Converter.Power Module Type
Instruction Manual
DHS-19
DHS
Fig. 4.6 Connecting External Parts (DHS250)
Fig. 4.5 Connecting External Devices (DHS50, DHS100)
Adjustment range [%]
Adjustment range [%]
Input voltage [V]
DHS250B
Input voltage [V]
DHS50B, DHS100B
Fig. 4.4 Output Voltage Adjustment Range
Table 4.3 Recommended Values of External Resistors (DHS250)
DHS50
DHS100
+Vout
TRM
-Vout
Load
Output
External Resistor
R1
External Resistor
R2
External VR
1
2
3
5k
W
200
100
110
120
250
0
0
60
3.3, 5V
Others
200
100
110
120
250
0
0
90
3.3, 5V
Others
1
Adjustment range [%]
Adjustment range [%]
Input voltage [V]
DHS200A
Input voltage [V]
DHS50A, DHS100A
DHS250
DHS200
Control Amp. of
rated voltage
-
+
+S
+VOUT
TRM
-S
-VOUT
2.495V
RA
3k
W
3k
W
RB
RC
10
W
R2
R1
1
VR1
5k
W
3
2
me̲dhs1.indd DHS-19
me dhs1 indd DHS-19
2015/06/19 11:08:05
2015/06/19 11:08:05
