(a) (b) (c)
ON
POWER
RC2
RC3
AUX
OFF
-S
typ
12V
150
W
2.2k
W
ON
POWER
RC2
RC3
AUX
OFF
-S
typ
12V
150
W
2.2k
W
typ
12V
150
W
2.2k
W
ON
POWER
RC2
RC3
AUX
OFF
-S
Fig.3.3 RC2
-
RC3 connection example
¡
Make sure that sink current of output side remote ON/OFF circuit
should be less than 12mA.
(3) Auxiliary power supply for remote ON/OFF(AUX)
¡
AUX is built in for operating the output side remote ON/OFF
(RC2
-
RC3).
If AUX is not used for RC2
-
RC3, AUX can be used for IOG or
TMP signal output by opto coupler.
¡
Short protection resistance(2.2k
W
) is built in.
Output voltage decreases as the output current increases.
(AUX voltage at open circuit: 15V max)
3.6 Remote sensing
(1) When the remote sensing function is not in use
¡
When the remote sensing function is not in use, it is necessary to
confirm that pins are shorted bS & +VOUT and between
-S & -VOUT.
¡
Wire bS & +VOUT and between -S & -VOUT as short as
possible.
Loop wiring should be avoided.
This power supply might become unstable by the noise coming
from poor wiring.
(2) When the remote sensing function is in use
¡
Twisted-pair wire or shield wire should be used for sensing wire.
¡
Thick wire should be used for wiring between the power supply
and a load.
Line drop should be less than 0.5V.
Voltage bVOUT and -VOUT should remain within the
output voltage adjustment range.
¡
If the sensing patterns are short, heavy-current is drawn and the
pattern may be damaged.
The pattern disconnection can be prevented by installing the pro-
tection parts as close as a load.
+S
-S
+VOUT
-VOUT
OUT
Co
Load
Short at pin root
+
Fig.3.4 Connection when the remote sensing is not in use
+S
-S
+VOUT
-VOUT
OUT
Load
Wire as close as possible
Co
+
Fig.3.5 Connection when the remote sensing is in use
3.7 Adjustable voltage range
¡
Output voltage is adjustable by the external potentiometer or by
applied voltage externally.
The adjustable range is 60 - 110% of the rated output voltage.
¡
When the output voltage adjustment is used, note that the over-
voltage protection circuit operates when the output voltage sets
too high.
(1) Adjusting method by external resistor
¡
By connecting the external potentiometer(VR1) and resistors(R1,
R2), output voltage becomes adjustable, as shown in Fig.3.6, rec-
ommended external parts are shown in Table 3.3.
¡
The wiring to the potentiometer should be as short as possible.
The temperature coefficient becomes worse, depending on the
type of a resistor and potentiometer. Following parts are recom-
mended for the power supply.
Resistor
Metal film type, coefficient of less than
�
100ppm/
C
Potentiometer Cermet type, coefficient of less than
�
300ppm/
C
¡
When the output voltage adjustment is not used, open the TRM
pin and VB pin respectively.
RB
10k
W
-
+
RA
15k
W
Reference
voltage 2.5V
VR1
R2
R1
TRM
VB
+S
+VOUT
-VOUT
-S
Control Amp.
of rated
voltage
Fig.3.6 Output voltage control circuit
DC-DC Converters Bus Converter
-
Power Module Type
Instruction Manual
DBS-16
June 26, 2020
