TDK-Lambda LS25 Series User manual

TDK-Lambda
LS 25-150 Series
INSTRUCTION MANUAL
LS25~150 Series
Instruction Manual
BEFORE USING THE POWER SUPPLY UNIT
Pay attention to all warnings and cautions before using the unit. Incorrect usage could lead to an electrical
shock, damage to the unit or a fire hazard.
WARNING and CAUTION
zDo not modify.
zDo not touch the internal components, they may have high voltage or high temperature. You may get
electrical shock or burned.
zWhen the unit is operating, keep your hands and face away from it as you may be injured by flying debris in
the event of a fault.
zThis power supply is designed for use within an end product. Stick the WARNING label for users on the
system equipment and notify in the system instruction manual.
zNever operate the unit under over current or short-circuit conditions for more than 30 seconds or outside its
specified Input Voltage Range. Insulation failure, burning, smoke or other damages may occur.
zConfirm connections to input/output terminals are correct as indicated in the instruction manual.
zThis power supply has a possibility for hazardous voltage to appear at output terminal depending on the type
of failure. The outputs of these products must be earthed in the end equipment to maintain SELV.
If the outputs are not earthed, they must be considered hazardous and must not be made user accessible.
Note: CE MARKING
CE marking, when applied to the LS series products, indicates compliance with the Low Voltage Directive
(2006/95/EC) in that it complies with EN60950-1.
DWG NO. : PA582-04-01-A
APPD CHK DWG

1
TDK-Lambda
LS 25-150 Series
INSTRUCTION MANUAL
1. Terminal Explanation
LS25, LS35, 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
zInput must be off when making connection.
zConnect FG terminal to ground terminal of the equipment.
zThe output load line and input line shall be separated and twisted to improve noise immunity.
LS25, LS35, LS50, LS75 LS100, LS150
Maximum output current of each output terminalis25AexceptforLS25(15A).
If more than 25A, use 2 terminals.
LN V
ADJ
-V -V +V +V
H
LOAD
-
+
LN V
ADJ
-V +V
H
LOAD
-
+
5
4
3
2
1
LN V
ADJ
-V +V
H
LN V
ADJ
-V -V +V +V H
1
2
3
4
5
6
7

2
TDK-Lambda
LS 25-150 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 LS25 ~ 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 damage the unit. 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 able to 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
increase the output voltage. 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 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 except for LS25. The input need to be removed for a few minutes, and then
re-input for recovery of the output. OVP setting is fixed and cannot be adjusted externally.
Note : For LS25, OVP function will cause the output into ”hiccup” mode and damage the unit.
3-5. Over Current Protection (OCP)
OCP function operates when the output current exceeds OCP specifications. The output will automatically recover 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 ca-
pacitor & 47uF electrolytic capacitor. When load lines are longer, ripple becomes 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.

3
TDK-Lambda
LS 25-150 Series
INSTRUCTION MANUAL
3-7. Series Operation
For series operation, either method ( A ) or ( B ) is possible.
Method(A) Method(B)
Output
Terminal
Output
Terminal
Load
Power
Supply
Power
Supply
Load
Load
Output
Terminal
Output
Terminal
Note : In case of Method ( A ), please connect diodes to prevent the reverse voltage.
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 ( VF) of the diode.
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)
Load
Output
Terminal
Output
Terminal
Power
Supply
Output
Terminal
Output
Terminal
Loa
d
Power
Supply

4
TDK-Lambda
LS 25-150 Series
INSTRUCTION MANUAL
4. Isolation / Withstand Voltage
4-1. Isolation Test
Isolation resistance between output and FG (chassis) shall be more than 100MΩat 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, 100MΩor more
AC(L)
AC(N)
FG
+ V
+V
- V
- V
Isolation
Tester
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 with-
stand 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)
FG
+V
+V
-V
-V
Withstand
Voltage
Tester
AC(L)
AC(N)
FG
+V
+V
-V
-V
Withstand
Voltage
Tester

5
TDK-Lambda
LS 25-150 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 Output
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 denoted as 100%.
` (A) Output Derating versus Ambient Temperature (Convection Cooling)
LS25-3.3
Output Derating Vs Ambient Temperature
0
20
40
60
80
100
120
-25 0 25 50 75 100
Ambient Temperature (
o
C)
Load (%)
Mounting
A & D
Mounting
B & C
50
40 65 70

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TDK-Lambda
LS 25-150 Series
INSTRUCTION MANUAL
LS25-5, -12, -15, -24, -36 & -48
Output Derating Vs Ambient Temperature
0
20
40
60
80
100
120
-25 0 25 50 75 100
Ambient Temperature (
o
C)
LS35-3.3, -5, -12, -15, -24, -36 & -48
Output Derating Vs Ambient Temperature
0
20
40
60
80
100
120
-25 0 25 50 75 100
Ambient Temperature (
o
C)
Mounting
A & D
Mounting
B & C
Load (%)
50
40 65 70
Mounting
A,B & D
Mounting
C
Load (%)
65 70
45
50

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TDK-Lambda
LS 25-150 Series
INSTRUCTION MANUAL
LS50-3.3, -5, -12, -15, -24, -36 & -48
LS75-3.3,-5
Output Deratin
g
Vs Ambient Temperature
0
20
40
60
80
100
120
-25 025 50 75 100
Ambient Temperature (°C)
Load (%)
Mounting
Mounting
A, B & D
C
70
70
60
45
Output Derating Vs Ambient Temperature
0
20
40
60
80
100
120
-25 025 50 75 100
Ambient Temperature (°C)
Load (%)
Mounting
Mounting
A,B&D
C
40 60
70
50
70

8
TDK-Lambda
LS 25-150 Series
INSTRUCTION MANUAL
LS75-12, -15, -24, -36 & -48
LS100-3.3, -5
Output Derating Vs Ambient Temperature
0
20
40
60
80
100
120
-25 025 50 75 100
Ambient Temperature (°C)
Load (%)
Mounting
Mounting
A&B
C&D
50
70
45
40
Output Derating Vs Ambient Temperature
0
20
40
60
80
100
120
-25 025 50 75 100
Ambient Temperature (°C)
Load (%)
Mounting
Mounting
C
A, B & D
7060
70

9
TDK-Lambda
LS 25-150 Series
INSTRUCTION MANUAL
LS100-12, -15, -24, -36 & -48
LS150-3.3, -5
Output Deratin
g
Vs Ambient Temperature
0
20
40
60
80
100
120
-25 025 50 75 100
Ambient Temperature (°C)
Load (%)
Mounting
Mounting
A
B, C & D
50
7030 40
Output Derating Vs Ambient Temperature
0
20
40
60
80
100
120
-25 025 50 75 100
Ambient Temperature (°C)
Load (%)
Mounting
Mounting
A&B
C&D
50
70
45