TDK-Lambda LS-75-12 User guide

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