TDK-Lambda CUS250LD Mode D'emploi page 15

4-2. Output Voltage Range
Output voltage is set at rated value at shipment. Vadj trimmer (VR51) can adjust the output voltage within the range. Output voltage range is
within 10% of nominal output voltage. Turn the trimmer clockwise, the output voltage will be increased. Take note when the output
voltage is increased excessively, over voltage protection (OVP) function may trigger and voltage will be shut down. Furthermore, when
increasing the output voltage reduce the output current so as not to exceed the maximum output power.
4-3. Inrush Current
This series equipped Power Thermistor to limit the inrush current. Higher inrush 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.
4-4. Over Voltage Protection (OVP)
The OVP function (PSU shut down method, manual reset type) is provided. Please refer to its specification for OVP operating range. When
OVP trigger, the output will be shut down. To reset OVP, remove the input of power supply for 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)
CUS250LD Series: Hiccup mode with automatic recovery.
OCP function operates when the output current exceeds 105% of maximum DC output current of specification. The output will be
automatically recovered when the overload condition is canceled. Never operate the unit under over current or shorted conditions for more
than 30seconds, which may lead damage or failure. OCP setting is fixed and not to be adjusted externally.
4-6. Output Ripple and Noise
Ripple and noise are measured at 20MHz by using a 12'' twisted pair terminated with a 0.1uF & 47uF capacitor. When load cables 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. For start up at low ambient temperature,
output ripple noise might not meet specification. However, output ripple noise specification can be met after few seconds.
PSU
4-7. Series Operation
For series operation, either method (A) or (B) is possible.
(A)
Power Supply
Output
Terminal
Output
Terminal
(*1)
(*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.
4-8. Parallel Operation
For parallel operation, method (B) is possible.
12''
Coaxial Cable
1.5m 50 ohm
(B)
Power Supply
Output
Terminal
Load
Output
Terminal
- 2 -
TDK-Lambda
CUS250LD Series
Instruction Manual
C1: 0.1uF Film Cap
C2: 47uF Electric Cap
Oscilloscope Bandwidth: 20MHz
Load
Load