TDK-Lambda CUS200LD Manuel D'installation page 16

4-6. Output Ripple & Noise
The measurement circuit of the output ripple and noise in the specifications is shown below. If the load wires are
longer, the ripple and noise will be higher. In this case, electrolytic capacitor, film capacitor, etc. might be
necessary to be used across the load terminal. The ground lead of probe should be short to avoid the noise
interference
150mm
+
Power
C1
Supply
-
4-7. Series Operation
For series operation, either method (A) or (B) is possible.
Method (A)
+V
Power
Supply
-V
+V
Power
Supply
-V
Note :
In case of method (A), it is recommended to connect the bypass diodes, power supply might be damaged
without bypass diodes.
Please select a bypass diode with maximum forward current rating more than output load current. And
maximum reveres voltage must withstand output voltage of each power supply.
Series operation is possible without bypass diode, but make sure all units must be in operation.
(Never use in condition that one of the units is not operated.)
4-8. Parallel Operation
For parallel operation, method (B) is possible.
(A) To increase the Output Current is not possible.
+V
Power
Supply
-V
+V
Power
Supply
-V
C1 : 0.1uF Cap., Film
C2 : 100uF Cap., Elect
C2 Load
C3 : 4700pF Cap., Ceramic
R1 : 50
Coaxial Cable
R1
1.5m 50
C3
+
Load
-
Bypass diodes
+
Load
-
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Oscilloscope
Bandwidth : 20MHz
Method (B)
+V
Power
Supply
-V
+V
Power
Supply
-V
(B) Operation as a Backup System is possible.
1. Adjust the output voltage higher to compensate
the forward voltage drop (VF) of the diode.
2. Adjust each power supply output to same voltage.
3. Output voltage and output power should be used
within specifications.
4. Use blocking diode to prevent reverse current.
Diode current rating must be more than output load
current.
+V
Power
Supply
-V
+V
Power
Supply
-V
TDK-Lambda
CUS200LD
INSTRUCTION MANUAL
+
Load
-
+
Load
-
+
Load
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