・All specifications are subject to change without notice.
LS
Series
MODEL Recommended Wire Recommended torque
Recommended crimp-type terminal
D (MAX) t (MAX)
Mounting Pieces
(MAX)
LS25
AWG16-22
M3.0 Screws
0.49 N·m (5.0 kgf·cm)
6.0mm 0.8mm 2 piece
LS35- LS150
AWG14-22
M3.5 Screws
1.0 N·m (9.8 kgf·cm) - 1.4 N·m (13.7 kgf·cm)
6.8mm 0.8mm 2 piece
Maximum external capacitance
MODEL 3.3V 5V 12V 15V 24V 36V 48V
LS25 10,000uF 5,000uF 2,000uF 1,000uF 500uF
L35 - LS50 10,000uF 5,000uF 2,000uF 500uF
LS75 - LS150 10,000uF 5,000uF 1,000uF
6. Wiring Method
• The input and output load wires shall be separated and
twisted to improve noise immunity.
• Both wires must be as thick and short as possible to make
lower impedance.
• Noise can be reduced by connecting a film capacitor with
0.1uF capacitance across the load terminals.
• For safety and EMI considerations, connect the FG terminal
of LS series to mounting set ground terminal.
• The recommended wire type :
7. External Fuse Rating
Refer to the following fuse rating when selecting the external
input fuse. Surge current flows when input turns on. Fuse rat-
ing is specified by Inrush Current value at input turn on. Do not
select the fuse according to input current (rms) values under
the actual load condition.
LS25 : F1.6A , 250V
LS35, LS50 : T2A , 250V
LS75 : T2.5A, 250V
LS100 : F4A, 250V
LS150 : F5A, 250V
8.
Before concluding that the unit is at fault, make the following checks.
• Check if the rated input voltage is connected.
• Check if the wiring of input and output is correct.
• Check if the wire size is correct.
• Check if the output voltage control (V.ADJ) is properly adjusted.
• Check if the output current and output wattage does not
exceed the specification.
• Ensure that a large capacitor is not connected across the
output terminals. Please use within maximum capacitance
shown below.
Note 1 : When using separate loads, it is recommended to use 2 pieces of 0.8mm thick crimp-type terminal.
Note 2 : For recommended wire diameter, refer to wire maker recommended allowable current and voltage drop.
For higher output current model like 3.3V & 5V, bigger diameter wire is recommended.
NOTE : It is normal to hear audible noise from power-supply under Dynamic Load operation or if the input voltage waveform
is not sinusoidal.
9. Warranty Condition
This product is under warranty for 3 years ( based on 8
hours/day operation) from the date of shipment. During the
warranty period, TDK-Lambda will, at it’s option, either repair
or replace products prove to be defective.
Warranty applies but not limited to the following.
• Average operating temperature (ambient temperature of the
power supply unit) is under 40°C.
• Average load factor is 80% or less.
• Installation method : Standard installation.
Following cases are not covered by warranty.
• Improper usage and mis-handling like dropping or apply-
ing shock to the unit and defects from operation exceeding
specification of the product.
• Defects resulting from natural disaster (fire, flood).
• Unauthorized modification or repair.
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