Over Current Protection (Ocp) - TDK-Lambda CUS100MB Series Instruction Manual

4-4. Over Voltage Protection (OVP)
The OVP function (Inverter shut down method, manual reset type) is provided. Please refer to its specification for OVP
operating range. When OVP triggers, the output will be shut down. To reset OVP, remove the input of power supply for a few
minutes, and then re-input. In addition, the setting value of OVP is fixed and not adjustable. Pay attention not to apply higher
voltage externally to the output terminal to avoid unit failure. In case of inductive load, put protective diode in series to the
output power line.

4-5. Over Current Protection (OCP)

The OCP is hiccup mode with automatic recovery. The outputs will be automatically recovered when the overload condition
is canceled.
OCP function operates when the output current exceeds 105% of maximum DC output current of specification. Never operate
the unit under over current or shorted conditions for more than 30seconds, which may leads damage or insulation failure. OCP
setting is fixed and not to be adjusted externally.
4-6. Output Ripple & Noise
The standard specification for maximum ripple value is measured according to measurement circuit specified as below. When
load lines are longer, ripple will becomes larger. In this case, electrolytic capacitor, film capacitor, etc. might be necessary to
use across the load terminal. The output ripple cannot be measured accurately if the probe ground lead of oscilloscope is too
long.
A circuit reducing light load input power consumption is built in this model. When output current is within 0-35% of rated
load, the internal switch element is intermittent operated, and the switching loss is decreased. The specification of the Ripple
& Noise changes by this intermittent operation. The dynamic load response characteristic changes by this intermittent
operation too. Different input voltage and dynamic load condition has different dynamic load response characteristic. Please
contact us for details.
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Power
Supply
4-7. Series Operation
For series operation, either method (A) or (B) is possible.
Method (A)
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Power
Supply
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Power
Supply
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(*1)Please select a bypass diode with maximum forward current rating more than output load current. And maximum reverse
voltage must withstand each power supply output voltage.
150mm
C1
C2
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Coaxial Cable
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Load
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(*1)
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C1 : 0.1uF Cap., Film
C2 : 100uF Cap., Elect
Load
C3 : 4700pF Cap., Ceramic
R1 : 50Ω
Oscilloscope
R1
1.5m 50Ω
C3 Bandwidth : 20MHz
Method (B)
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Power
Supply
-V
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Power
Supply
-V
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TDK-Lambda
CUS100MB
INSTRUCTION MANUAL
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Load
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