10/22
TDK-Lambda
CUS600M
INSTRUCTION MANUAL
6-3. Inrush Current
These products equipped power thermistor to limit the inrush current. Higher current will flow at higher ambient temperature or re-input
condition. Please select input switch and fuse carefully with the high temperature and re-input the power condition. The inrush current value
is under cold start at 25
℃
in the specification.
6-4. Over Voltage Protection (OVP)
The OVP function (Inverter shut down method, manual reset type) is provided. Please refer to its specification for OVP range. When OVP
triggers, the output will be shut down. 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.
Two methods to recovery from OVP:
Turn off the input of power supply for a few minutes, and then re-input.
Remote OFF, and then remote ON again. (Refer to 6-14.)
6-5. Over Temperature Protection (OTP)
Over temperature shut down function is provided.
When ambient or internal temperature rises abnormally, over temperature protection function operates and output will be shut down. After
shut down, remove the input and cool it down to reset over temperature protection, and then re-input.
Over temperature protection function operates at out of the specification area.
This function may not activate or cannot avoid power supply damage depending on the situation.
6-6. Over Current Protection (OCP)
These products provide the Hiccup mode with automatic recovery. OCP function operates when the output current exceeds 105% of
maximum DC output current at forced air cooling of specification. The outputs will be automatically recovered when the overload condition
is canceled, however the outputs may be latched off when shorted condition happens. Never operate the unit under over current or shorted
conditions, which may lead damage or insulation failure. OCP setting is fixed and not to be adjusted externally.
6-7. 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 become 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.
Load
C1
150mm
C2
Coaxial Cable
1.5m 50
Ω
R1
C3
Oscilloscope
Bandwidth : 20MHz
Power
Supply
V+
V
‐
C1 : 0.1uF Film Cap.
C2 : 100uF Electric Cap.
C3 : 4700pF Ceramic Cap.
R1 : 50
Ω
A
6-8. Series Operation
For series operation, either method (A) or (B) is possible.
Note: In case of (A), please select a bypass diode (*3) with maximum forward current rating more than output load current. And maximum
reverse voltage must withstand each power supply output voltage.
Never use when one of the unit not operate, which may lead damage.
Load
Load
V+
V+
V-
V-
V+
V+
V-
V-
(*3)
Method (A)
Method (B)