ZU/ZT-47
4 Series Operation and
Parallel Operation
4.1 Series operation
n
Series operation is available by connecting the outputs of two or
more power supplies, as shown below. Output currents in series
connection should be lower than the lowest rated current in each
unit.
But at series operation with same output voltage, diode is not re-
quired to attach even if at (a).
(a) When the output voltage is less than 5V.
Power
supply
+
-
Power
supply
+
-
Load
D1
D2
D4
D3
D1 - D4: Please use Schottky Barrier Diode.
(b) When the output voltage is more than 12V.
D1, D2: Please use Schottky Barrier Diode.
4.2 Redundancy operation
n
Redundancy operation is available by connecting the units as
shown below.
5 Assembling and
Installation Method
5.2 Derating
n
n
Ambient temperature around each power supply should not ex-
ceed the temperature range shown in derating curve.
It is necessary to note thermal fatigue life by power cycle.
Please reduce the temperature fluctuation range as much as pos-
sible when the up and down of temperature are frequently gener-
ated.
6 Input Voltage/
Current Range
n
n
When a non-regulated source is used as a front end, make sure
that the voltage fluctuation together with the ripple voltage will not
exceed the input voltage range.
Select the converter that is able to handle the start-up current (Ip).
Fig.6.1 Input current characteristics
ZT1R5 ZT3
100
50
0
-20
0
10
20
30
40
50
60
(71)
(85)
70
80
90
-10
Load
factor
[%]
Ambient temperature [ ]
1 ZTS30512, ZTS30515
ZTW30512, ZTW30515
Convection[ 1 models]
Convection[Other models]
Forced air(500 /min)[ 1 models]
Forced air(500 /min)[Other models]
ZU/ZT
Instruction
anual
M
DC-DC Converters PCB Mount type
5.1 Installation method
n
The unit can be mounted in any direction. Install the device, with
proper intervals to allow enough air ventilation.
