ZU/ZT-47

4 Series Operation and

Parallel Operation

4.1 Series operation

nSeries 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

+

-

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

nRedundancy 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

102030405060

(71)

(85)

70

80

90

-10

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

nThe unit can be mounted in any direction. Install the device, with

proper intervals to allow enough air ventilation.

October 08, 2013