(4) Input voltage derating
¡
When input voltage is 18-21.5V DC or 36-44VDC, the output
voltage adjustment range becomes as shown in Fig.4.7.
36
100
105
110
115
120
40
76
0
0
95
90
3.3V
5V
10V,12V
4812H
44
36
100
105
110
115
120
40
76
0
0
90
80
95
3.3V
5V
12V
3.3V,5V
12V
CHS6048
CHS8048/CHS20048/CHS30048/
CHS40048/CHS50048
80
ADJU
STM
EN
T R
AN
GE [%]
ADJU
STM
EN
T R
AN
GE [%
]
INPUT VOLTAGE [V]
36
100
105
110
115
120
43
76
0
0
90
80
95
3.3V
5V
12V
CHS12048
INPUT VOLTAGE [V]
INPUT VOLTAGE [V]
CHS30024
ADJU
STM
EN
T R
AN
GE [%
]
ADJU
STM
EN
T R
AN
GE [%
]
INPUT VOLTAGE [V]
18
100
105
110
115
120
21.5
36
0
0
80
5V
12V
15V
20
Fig.4.7 CHS Output Voltage Adjustment Range
4.7 Isolation
¡
For a receiving inspection, such as Hi-Pot test, gradually increase
(decrease) the voltage to start (shut down). Avoid using Hi-Pot
tester with timer because it may generate voltage a few times
higher than the applied voltage at ON/OFF of a timer.
4.8 PMBus interface
¿
-I (CHS300/CHS400)
¡
This option is equipped with a digital PMBus interface.
Please contact us about for details.
5 Series and Parallel Operation
5.1 Series operation
¡
Series operation is available by connecting the outputs of two or
more power supplies, as shown below. Output current in series
connection should be lower than the lowest rated current in each
unit.
Power
Supply
+
-
Power
Supply
+
-
Load
Power
Supply
+
-
Power
Supply
+
-
(a)
(b)
Load
Load
Fig.5.1 Examples of series operation
5.2 Parallel operation
¿
-P (CHS400/CHS500)
¡
This option is for parallel operation.
¡
Sensing and adjustment of the output voltage are not possible at
the time of the use with this option.
¡
As variance of output current drew from each power supply is
maximum 10%, the total output current must not exceed the value
determined by the following equation.
(Output current in parallel operation)
=(the rated current per unit) x (number of unit) x0.9
When the number of units in parallel operation increases, input
current increase at the same time. Adequate wiring design for in-
put circuitry is required, such as circuit pattern, wiring and current
capacity for equipment.
¡
Total number of units should be no more than 3 pieces.
¡
Thick wire should be used for wiring between the power supply
and load, and line drop should be less than 0.3V.
¡
Connect each input pin for the lowest possible impedance.
¡
When the number of the units in parallel operation increases,
inputcurrent increases. Adequate wiring design for input circuitry
such as circuit pattern, wiring and current for equipment is re-
quired.
+Vin
RC
-Vin
+Vout
-Vout
SW
+Vin
RC
-Vin
+Vout
-Vout
DC
INPUT
LOAD
Fuse
Fuse
Fig.5.2 Examples of parallel operation
CHS-26
DC-DC Converters Bus Converter.Power Module Type
Instruction Manual
