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4-8. Output Ripple & Noise
Ripple & noise are measured at 20MHz by 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 may
also be observed due to large ESR of the internal Electrolytic Capacitors especially at -25°C.
4-9. Series Operation
For series operation, either method ( A ) or ( B ) is possible.
Method ( A )
Power Supply
+S
+V m
-V m
-S
+S
+V m
-V m
-S
4-10. Parallel Operation
(A) Operation to increase the Output Current is not possible.
(B) Operation as a Backup Power Supply is possible as follows:
1.
Set the power supply output voltage higher by the amount of forward voltage drop ( V
2.
Please adjust the output voltage of each power supply to be the same.
3.
Please use within the specifications for output voltage, output current and output power.
(A)
Power Supply
+S
+V m
-V m
-S
+S
+V m
-V m
-S
Method ( B )
L oad
(B)
Power Supply
Load
7
TDK-Lambda
GWS
INSTRUCTION MANUAL
Power Supply
+S
+Vm
-Vm
-S
+S
+Vm
-Vm
-S
) of the diode.
F
+S
+V m
-V m
-S
+S
+V m
-V m
-S
Series
500
Load
Load
L oad
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