4 Series and Parallel
Operation
4.1 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.
Load
Load
Power
Supply
Power
Supply
Load
Power
Supply
Power
Supply
(a)
(b)
Fig. 4.1 Examples of series operation
4.2 Parallel operation
¡
Parallel operation is not possible.
¡
Redundancy operation is available by wiring as shown below.
+S
+VOUT
-S
-VOUT
+S
+VOUT
-S
-VOUT
Load
I
I
1
I
3
2
+S, -S : TUNS100F
Fig. 4.2 Example of Redundancy Operation
¡
Even a slight difference in output voltage can affect the balance
between the values of I
1
and I
2
.
Please make sure that the value of I
3
does not exceed the rated
current of a power supply.
I
3
the rated current value
5 Cleaning
¡
Clean the product with a brush. Prevent liquid from getting into
the product.
Do not soak the product into liquid.
¡
Do not stick solvent to a name plate or a resin case.
(If solvent sticks to a name plate or a resin case, it will cause
to change the color of the case or to fade letters on name plate
away.)
¡
After cleaning, dry them enough.
6 Lifetime expectancy depends on
stress by temperature difference
¡
Regarding lifetime expectancy design of solder joint, following
contents must be considered.
It must be careful that the soldering joint is stressed by tempera-
ture rise and down which is occurred by self-heating and ambient
temperature change.
The stress is accelerated by thermal-cycling, therefore the tem-
perature difference should be minimized as much as possible if
temperature rise and down is occurred frequently.
¡
Product lifetime expectancy depends on the aluminum base plate
central temperature difference (
D
Tc) and number of cycling in a
day is shown in Fig.6.1.
If the aluminum base plate center part temperature changes fre-
quently by changing output load factor etc., the above the lifetime
expectancy design should be applied as well.
Please contact us for details.
0
5
10
25
30
35
40
45
50
55
60
65
70
1time ON/OFF /1day
2times ON/OFF /1day
3times ON/OFF /1day
4times ON/OFF /1day
5times ON/OFF /1day
The aluminum base plate central temperature difference
D
Tc [
C
]
Lifetime expectancy [years
]
Fig.6.1 Lifetime expectancy against rise/fall temperature difference
Application manuals available at our website.
Recommended external components are also introduced for your
reference.
TUNS50F, TUNS100F
AC-DC Power Supplies Bus Converter.Power Module Type
Instruction Manual
TUNS-22
July 27, 2020
