INSTRUCTION MANUAL
PFE500F
Series
TDK-Lambda
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11. Series Operation
Series operation is possible for PFE500F Series. Connections shown in Fig. 11-1 and Fig. 11-2 are possible.
12. Parallel Operation (PC terminal)
By connecting the PC terminal of each power module, output current can be equally drawn from each module. A
maximum of 6 units of the same model can be connected.
However, maximum output current is derated by parallel operation units as shown in Table 12-1.
Note that usage of power module at out-of-rated condition might result in power module temperature abnormal
rise or damage.
Set the accuracy of the output voltage /-1% when adjust the output voltage for parallel operation.
When adjust the output voltage by applying external voltage at the TRIM terminal, insert a about 10k ohm
resistor between TRIM terminal and external source.
Moreover, external circuits are necessary for TRIM terminal at each individual module.
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Fig. 11-1 Series Operation for High Output Voltage Applications
+S
-S
-V
+V
Load
+
-
+S
+V
- S
-V
+S
- S
-V
+V
Load
+
-
+S
+V
- S
-V
+
-
Load
Fig. 11-2 +/-Output Series Applications
～
3 units
Parallel units
90% of nominal output current
Maximum output current
4
～
6 units
85% of nominal output current
Table 12-1 Condition for Parallel Operation
