Table 4.1.2 Specification of Remote ON/OFF
(CHS60,CHS120,CHS300,CHS380,CHS400,CHS500,CHS700)
ON/OFF
logic
Between RC and -VIN
Output
voltage
Standard Negative
L level(0 - 0.8V) or short
ON
H level(4.0 - 7.0V) or open
OFF
Optional -R
Positive
L level(0 - 0.8V) or short
OFF
H level(4.0 - 7.0V) or open
ON
When RC is ”Low” level, fan out current is 0.1mA typ. When Vcc is applied,
use 4.0
[
Vcc
[
7.0V.
¡
When remote ON/OFF function is not used, please short between RC and
-VIN (-R: open between RC and -VIN).
(2.0
[
Vcc
[
7.0V)
IC
Relay
Transistor
Photo coupler
RC
-VIN
RC
-VIN
RC
-VIN
RC
-VIN
Vcc
Fig.4.1 RC connection example
4.5 Remote sensing
(1) When the remote sensing function is not in use
+S
+VOUT
-S
Load
-VOUT
Short at pin root
Fig.4.2 Connection when the remote sensing 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 pos-
sible.
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
+S
Load
-S
+VOUT
-VOUT
Wire as close as possible
Fig.4.3 Connection when the remote sensing 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 0.3V.
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 possible to a load.
¡
Output voltage might become unstable because of impedance of
wiring and load condition when length of wire exceeds 40cm.
4.6 Adjustable voltage range
(1) To adjust output voltage
¡
Output voltage is adjustable by the external potentiometer.
¡
When the output voltage adjustment is used, note that the over
voltage protection circuit operates when the output voltage is set
too high.
¡
If the output voltage drops under the output voltage adjustment
range, the Low voltage protection operates.
¡
By connecting the external potentiometer (VR1) and resistors (R1,
R2), output voltage becomes adjustable, as shown in Fig.4.4.
Recommended external parts are shown in Table 4.2.
¡
The wiring to the potentiometer should be as short as possible.
The temperature coefficient could become worse, depending on
the type of a resistor and potentiometer. Following parts are rec-
ommended 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 respectively.
¡
The change speed of the TRM voltage should be less than 0.15V/
ms.
CHS-33
DC-DC Converters Bus Converter.Power Module Type
Instruction Manual