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3-9. Output Ripple & Noise
Ripple & noise are measured at 20MHz using a 300mm twisted pair of load wires terminated with a
0.1uF film capacitor & 47uF electrolytic capacitor. When load lines are longer, ripple becomes larger.
The output ripple cannot be measured accurately if the probe ground lead of oscilloscope is too long.
At low temperature, large ripple & noise is visible due to large ESR of the internal Electrolytic Capaci-
tors especially at -25
ture.
3-10. Series Operation
For series operation, either method (A) or (B) is possible.
Method ( A )
Power Supply
+S
+Vm
-Vm
-S
+S
+Vm
-Vm
-S
Note: In case of Method (A), please connect diodes to prevent the reverse voltage.
3-11. Parallel Operation
Power Supply
+S
+Vm
-V m
-S
+S
+Vm
-V m
-S
(A)
Operation to increase the Output Current is not possible.
(B)
Operation as a Backup Power Supply is possible as
(1)
Set the power supply output voltage higher by the amount of forward voltage drop (V
the diode.
(2)
Please adjust the output voltage of each power supply to be the same.
(3)
Please use within the specifications for output voltage and output current.
Connect "CNT+" terminal to "CNT-" terminal with wire CN2 connector.
o
C. Output voltage rise may not be smooth during initial turn on at low tempera-
Load
(A)
Load
6
TDK-Lambda
LS 200 Series
INSTRUCTION MANUAL
Method ( B )
Power Supply
+S
+Vm
-V m
-S
+S
+Vm
-V m
-S
(B)
Power Supply
+S
+Vm
-Vm
-S
+S
+Vm
-Vm
-S
follows:
Load
Load
Load
) of
F
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