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3. Explanation of Functions and Precautions
3-1. Input Voltage Range
Input voltage range is single phase 85 ~ 264VAC (47 ~ 63Hz) or 120 ~ 373VDC.
Input voltage which is out of specification, may damage the unit. For cases where conformance to vari-
ous safety specifications (UL, CSA, EN) are required, input voltage range shall be 100~240VAC
(50/60Hz).
Note: LS200 series is able to withstand Input Surge of 300VAC for 5 seconds.
3-2. Output Voltage Range
V.ADJ trimmer is for output voltage adjustment within the range of specifications. Turning the trimmer
clockwise will increase the output voltage. Kindly note that Over Voltage Protection (OVP) function
may trigger if the output voltage is increased excessively. Please ensure that the output power is below
the rated output power, and output current is below the maximum output current (3.3V ~ 15V and 48V)
or below the peak output current (24V ~ 36V) when output voltage is raised.
3-3. Inrush Current
Power Thermistor is built in to protect the circuit from high Inrush Current. Please select suitable input
switch and fuse rating in case of re-input the power at high temperature.
3-4. Over Voltage Protection (OVP)
The OVP function will shutdown the output. The input shall be removed for a few minutes to discharge
the power unit, before turn ON the AC input again to recovery the output. OVP setting is fixed and can-
not be adjusted externally.
3-5. Over Current Protection (OCP)
OCP function activates when the output current exceeds the specified OCP limit. The output will auto-
matically recover when the overload condition is removed. Do not operate overload or dead short condi-
tions for more than 30 seconds, which could result in damaging the power unit. However, there is no
possibility of fire or burning.
3-6. Over Temperature Protection (OTP)
Over Temperature Protection function (manual reset type) is available. When ambient or internal tem-
perature rises abnormally, OTP function will shut down the output. To recover the unit, first shut down
the AC input and let the unit cool down before turning ON the AC input.
3-7. Remote Sensing (+S, -S terminal)
Remote sensing function is provided to compensate for voltage drop across the wiring from the power
supply output terminals to the load input terminals. Connect "+S" terminal to "+V" terminal of the load
and "-S" terminal to the "-V" terminal of the load with sensing wires. The total line voltage drop (+Vm
side line and –Vm side line) shall be less than 0.3V. In the case that sensing wires are too long, it is
necessary to put an electrolytic capacitor across the load terminals. Example of external capacitor is
listed in the table below :
MODEL
LS200
Minimum external capacitance at the load input terminal
3.3V
5V
7.5V
2,200uF
12V
15V
24V
1,000uF
4
TDK-Lambda
LS 200 Series
INSTRUCTION MANUAL
36V
48V
470uF
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