5.1 Parallel operation
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Option:-P is for parallel operation (TUNS700F only).
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Terminal is different from the standard. See Figure 5.2.Position is the same as standard.
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There is no remote sensing function and the output voltage variable function.
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Total number of units should be 5 pieces or less.
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The length and width of output should be as same as possible to optimize the current sharing.
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Fig.5.1
Fig.5.2
TUNS700F
□□
-P
Pin Assignment
A-13
(Output current in parallel operation)
=(the rated current per unit) × (number of unit) × 0.9
Input capacitor C11, Boost voltage capacitor (Cbc, C20, C30), Inrush current protection resistor
RFR1, Output capacitor (Co) can not be shared. Please connect them to each power supply for
parallel operation. In addition, To avoid startup time difference, please use same value for Cbc
and RFR1 for each power supply.
Connect each input pin with as low impedance possible. When the number of the units in
parallel operation increases, input current increases. Adequate wiring design for input circuitry
such as circuit pattern, wiring and current for equipment is required.
If temperatures of aluminum base plates are different during among the power supplies for
parallel operation, voltage will vary significantly. balancing between module will not good.
Please consider the designing of heat dissipation to equalize the aluminum base plate
temperature.
+ M / -M terminal is the output voltage monitor terminal. Please do not take the current from +
M / -M terminal. Also, please do not connect the + M / -M each other parallel to the power
supply.
TUNS700F
□□
-P
Load
characteristic
The output current can be balanced by static load regulation the power supply. Output voltage -
output current characteristic is shown in Fig.5.1.
As variance of output current drawn from each power supply is 10% maximum, the total output
current must not exceed the value determined by the following equation.
2.1 Pin configuration
5. Parallel operation (option:‐P)
⑦-VOUT
⑧-M
①AC1
②AC2
③R
④+BC
⑨+M
⑥+VOUT
⑤-BC
⑩NC
⑪IOG
4-FG
Bottom view
Applications Manual
TUNS300/500/700
