Instruction
anual
M
DC-DC Converters PCB Mount type
n
To lower the output ripple voltage further, install an external ca-
pacitor Co at output terminal as shown below.
l
ZUS10/ZUW10
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.
(c)
ZU/ZT-37
ZUS
ZUW
Fig.3.2 Connecting method of external capacitor at output terminal
Capacity of external capacitor at output terminal: Co [µF]
Model
ZUS1R5
ZUW1R5
100
100
100
ZUS3
ZUW3
220
100
100
ZUS6
ZUW6
220
100
100
ZUS10
ZUW10
220
100
100
3, 5
12
15
Output voltage(V)
n
When the distance between load and DC output is long, please in-
stall capacitor at load as shown below.
Fig.3.3 Connection method of capacitor at load
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).
l
ZUS1R5/ZUW1R5 ZUS3/ZUW3
ZUS6/ZUW6
Power
supply
+
-
Power
supply
+
-
Load
D1
D2
D4
D3
(a)
When the output voltage is less than 5V.
D1 - D4: Please use Schottky Barrier Diode.
(b)
When the output voltage is more than 12V.
D1 D2: Please use Schottky Barrier Diode.
ZU1R5 ZU3 ZU6 ZU10
ZU/ZT
+VIN
-VIN
DC IN
+VIN
-VIN
DC IN
(a)
(b)
Reverse input voltage protection
Avoid the reverse polarity input voltage. It will damage the power
supply.
It is possible to protect the unit from the reverse input voltage by
installing an external diode as shown in Fig.3.4.
Fig.3.4 Reverse input voltage protection
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