1. Terminal Explanation
LS50, LS75
(1) L : Input terminal Live line (Fuse in line)
(2) N : Input terminal Neutral line
(3) FG
: Functional Ground
(4) - V : - Output terminal
(5) +V : + Output terminal
(6) Output voltage adjustable trimmer
(7) Output monitoring indicator (Green LED : ON)
LS100, LS150
(1) L : Input terminal Live line(Fuse in line)
(2) N : Input terminal Neutral line
(3) FG
: Functional Ground
(4) -V : - Output terminal
( 25A max./ terminal)
(5) +V : + Output terminal
( 25A max./ terminal)
(6) Output voltage adjustable trimmer
(7) Output monitoring indicator (Green LED : ON)
2. Terminal connecting method
LN V
-V +V
ADJ
LN V
-V
-V +V
+V
ADJ
NEMIC-LAMBDA
LS50
⋅75⋅
100⋅150 Series
INSTRUCTION MANUAL
1
2
3
4
5
H
1
2
3
4
5
6
7
H
z Input must be off when making connection.
z Connect FG terminal to ground terminal of the equipment.
z The output load line and input line shall be separated and twisted to improve noise sensitivity.
LS50, LS75 LS100, LS150
Maximum output current of each output terminal is 25A. If more than 25A, use 2 terminals
LN V
-V
-V +V
+V
ADJ
H
LOAD
+
LN V
-V +V
ADJ
-
LOAD
+
H
1
NEMIC-LAMBDA
LS50
⋅75⋅
100⋅150 Series
INSTRUCTION MANUAL
3. Explanation of Functions and Precautions
3-1. Input Voltage Range
Input voltage range is single phase 88 ~ 264VAC ( 47 ~ 63Hz ) or 125 ~ 373VDC for LS50, LS75 and LS100.
For LS150, selectable switch 115/230VAC will decide the input voltage range as mentioned in the table below.
Input voltage which is out of specification may cause unit to damage. For cases where conformance to various
safety specs(UL,CSA,EN) are required, input voltage range will be 100~240VAC (50/60Hz ).
Note : LS series can withstand Input Surge of 300VAC for 5 seconds.
LS150 – Selectable voltage range
Selected Range Applicable Input Voltage Range in VAC Applicable Input Voltage Range in VDC
115 88 ~ 132 NA
230 176 ~ 264 248 ~ 373
3-2. Output Voltage Range
V.ADJ trimmer is for output voltage adjustment within the range of specifications.Turning the trimmer clockwise will
cause the output voltage to be increased. Note over voltage protection ( OVP ) function may trigger if the output voltage
is increased excessively.
3-3. Inrush Current
Power Thermistor is built in to protect the circuit from Inrush Current. Please carefully select input switch and fuse in
cases of the high temperature and re-input the power.
3-4. Over Voltage Protection (OVP)
The OVP function ( Inverter shut down method, manual reset type ) is provided. When OVP triggers, the output will be
shut down. The input shall be removed for a few minutes, and then re-input for recovery of the output. OVP setting is
fixed and not to be adjusted externally.
3-5. Over Current Protection (OCP)
Current limiting, automatic recovery. OCP function operates when the output current exceeds OCP specifications. The
output will be automatically recovered when the overload condition is removed. Do not operate overload or dead short
conditions for more than 30 seconds, which could result in damage or insulation failure.
3-6. 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 will become 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 -25degC. Output voltage rise may
not be smooth during initial turn on at low temperature.
2
3-7. Series Operation
For series operation, either method ( A ) or ( B ) is possible.
Method ( A ) Method ( B )
Power
Power
Supply
Output
Terminal
Load
Supply
Output
Terminal
NEMIC-LAMBDA
LS50
⋅75⋅
100⋅150 Series
INSTRUCTION MANUAL
Load
Output
Terminal
Output
Terminal
3-8. 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 and output current.
(A) (B)
Power
Supply
Output
Terminal
Load
Power
Supply
Output
Term inal
Load
) of the diode.
F
Load
Output
Terminal
Output
Term inal
3
NEMIC-LAMBDA
LS50
⋅75⋅
100⋅150 Series
INSTRUCTION MANUAL
4. Isolation / Withstand Voltage 4-1. Isolation Test
Isolation resistance between output and FG (chassis) shall be more than 100MΩ at 500VDC. For safety, voltage setting
of DC isolation tester must be done before the test. Ensure that the unit is fully discharged after the test.
(a) Output ~ FG (chassis) : 500VDC, 100MΩ or more
AC(L)
AC(N)
Isolation
+ V
+V
- V
- V
Tester
FG
4-2. Withstand Voltage
This series is designed to withstand 3.0kVAC between input and output, 1.5kVAC between input and FG (chassis) and
500VAC between output and FG (chassis) each for 1 minute. When testing withstand voltage, set current limit of withstand voltage test equipment at 20mA ( Output-FG (chassis) : 100mA ). The applied voltage must be gradually increased
from zero to testing value and then gradually decreased for shut down. When timer is used, the power supply may be
damaged by high impulse voltage at timer switch on and off. Connect input and output as follows :
(a) Input ~ FG (chassis) : solid line (c) Output ~ FG (chassis) : 500VAC, 1min (100mA)
1.5kVAC, 1min (20mA)
(b) Input ~ Output : dotted line
3kVAC, 1min ( 20mA )
AC(L)
AC(N)
+V
+V
-V
-V
AC(L)
AC(N)
+V
+V
-V
-V
Withstand
Voltage
Tester
FG
4
Withstand
Voltage
Tester
FG
NEMIC-LAMBDA
LS50
⋅75⋅
100⋅150 Series
INSTRUCTION MANUAL
5. Mounting Directions
5-1. Output Derating according to the Mounting Directions
Recommended standard mounting is Method ( A ). Method ( B ), ( C ) and ( D ) are also possible. Refer to the derating
below. Please do not use installation Method ( E ), where the PCB will be on the topside and heat will be trapped inside
the unit.
In the following derating curve, the maximum output current is considered to be 100%.
(A) Output Derating versus Ambient Temperature (Convection Cooling)
LS50-3.3, -5, -12, -15, -24, -36 & -48
Load
120
100
80
70
60
50
40
20
0
-25 0 25 50 75
Output Derating Vs Ambient Temperature
40 60
Ambient Temperature (°C)
70
100
Mounting
A, B & D
Mounting
C
5
LS75-3.3, -5
NEMIC-LAMBDA
LS50
⋅75⋅
100⋅150 Series
INSTRUCTION MANUAL
Load
120
100
80
70
60
40
20
0
-25 0 25 50 75
Output Derating Vs Ambient Temperature
45
Ambient Temperature (°C)
60
70
100
Mounting
A, B & D
Mounting
C
LS75-12, -15, -24, -36 & -48
Load
120
100
80
70
60
40
20
0
-25 0 25 50 75 100
Output Derating Vs Ambient Temperature
70 60
Ambient Temperature (°C)
Mounting
A, B & D
Mounting
C
6
LS100-3.3, -5
NEMIC-LAMBDA
LS50
⋅75⋅
100⋅150 Series
INSTRUCTION MANUAL
Load
120
100
80
60
50
40
20
0
-25 0 25 50 75
Output Derating Vs Ambient Temperature
40
45
Ambient Temperature (°C)
70
100
Mounting
A & B
Mounting
C & D
LS100-12, -15, -24, -36 & -48
Load
120
100
80
60
50
40
20
0
-25 0 25 50 75
Output Derating Vs Ambient Temperature
45
Ambient Temperature (°C)
70
Mounting
A & B
Mounting
C & D
100
7
LS150-3.3, -5
NEMIC-LAMBDA
LS50
⋅75⋅
100⋅150 Series
INSTRUCTION MANUAL
Load
120
100
80
60
50
40
20
0
-25 0 25 50 75
Output Derating Vs Ambient Temperature
40
30
Ambient Temperature (°C)
70
100
Mounting
A
Mounting
B, C & D
LS150-12, -15, -24, -36 & -48
Load
120
100
80
70
60
40
20
0
-25 0 25 50 75
Output Derating Vs Ambient Temperature
40
Ambient Temperature (°C)
70
Mounting
A
Mounting
B, C & D
100
8
(B) Output Derating versus Input Voltage (Convection Cooling)
LS100-3.3, -5, -12, -15, -24, -36 & -48
NEMIC-LAMBDA
LS50
⋅75⋅
100⋅150 Series
INSTRUCTION MANUAL
LOAD (%)
120
100
80
60
40
20
0
88 230
Output Derating Vs Input Voltage
115
Vin (VAC)
NOTE : LS50, LS75 & LS150 series do not require Input Voltage Derating.
5-2 Mounting Method
264
1) This is convection cooling type power supply. In consideration of the heat radiation and safety, please keep a dis-
tance of more than 15mm between the power supply and the peripheral parts. When lining up multiple units, please
make sure to place them 15mm or more apart from each other.
2) The maximum allowable penetration of mounting screws is 5mm.
3) Recommended torque for mounting screw LS50, LS75, LS100 & LS150 (M3 screw) : 0.49 N⋅m (5.0 kgf⋅cm).
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NEMIC-LAMBDA
LS50
⋅75⋅
100⋅150 Series
INSTRUCTION MANUAL
6. Wiring Method
z The output load line and input line shall be separated and twisted to improve noise sensitivity.
z Use all lines as thick and short as possible to make lower impedance.
z Noise can be reduced by attaching a capacitor to the load terminals.
z For safety and EMI considerations, connect the FG terminal of LS series to mounting set ground terminal.
z The recommended wire type :
MODEL
LS50 ~ LS150
Note 1 : When using separate loads, use of two pcs of 0.8mm thick crimp-type terminal is recommended.
Recommended
Wire
AWG14-22
Recommended torque
M3.5 Screws
1.0 N⋅m (9.8 kgf⋅cm) ~
1.4 N⋅m (13.7 kgf⋅cm)
Recommended crimp-type terminal
D
(MAX) t (MAX)
6.8mm
0.8mm
Mounting
Pieces
(MAX)
2 piece
Note 2 : For recommended diameter, refer to wire maker recommended allowable current and voltage drop.
Especially, for 3V or 5V models, output current is large. Thick diameter wire is recommended.
7. External Fuse Rating
Refer to the following fuse rating when selecting the external fuses that are to be used on input line. Surge current
flows when line turns on. Use slow-blow fuse or time-lag fuse. Do not use fast-blow fuse. Fuse rating is specified by
in rush current value at line turn-on. Do not select the fuse according to input current (rms) values under the actual load
condition.
LS50 : T2A , 250V
LS75 : T2.5A , 250V
LS100 : F4A , 250V
LS150 : F5A , 250V
8. Before concluding that the unit is at fault…
Before concluding that the unit is at fault, make the following checks :
z Check if the rated input voltage is connected.
z Check if the wiring of input and output is correct.
z Check if the wire material is not too thin.
z Check if the output voltage control (V.ADJ) is properly adjusted.
z Check if the output current and output wattage does not exceed the specification.
z Audible noise can be heard during Dynamic Load operation.
z Audible noise can be heard when input voltage waveform is not sinusoidal wave.
z Ensure that a large capacitor is not connected at the output side. Please use within maximum capacitance shown be-
low.
Maximum external capacitance
MODEL 3.3V 5V 12V 15V 24V 36V 48V
LS50 10,000uF 5,000uF 2,000uF 500uF
LS75~LS150 10,000uF 5,000uF 1,000uF
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