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LDD-250 laser diode driver


  • Laser diode driving


  • Up to 400 W output power
  • Up to 100 A output current
  • Wide range of input voltages
  • 0.98 power factor correction (PFC) value
  • Low EMI and leakage current

Download user manual (0.8MB)

LDD-250 is a series of medium-power laser diode drivers. It was designed to provide current by pulses or in continuous form to laser diodes, laser diode bars and stacks.

Several variants of LDD-250 are offered with different maximum output power (Pmax could be 150, 250 or 400 W), maximum output current (Imax range is 5 ... 100 A), maximum output voltage (Vmax≤ Pmax/ Imax), selected at the moment of order. For more detailed information see user manual.

Devices are encased and easy for the user to mount, they run on common 100‑240 V AC or 200‑240 V AC 50/60 Hz, so you don't need any extra power supply for the driver.

An output current level can be programmed in working range by user applying a DC voltage to the respective pin. An operating frequency and pulse width are set by an external low voltage TTL signal from pulse generator. Base interface to control LDD is analogue (15 Pin “D”-Sub Female).

It is also possible to control the module through an additional external PCBs (should be purchased separately), either stand-alone (ordering code – STA) with jumpers and trimpot or driven by a computer through RS‑232 interface (ordering code – RS232).

Diode drivers were designed to comply with IEC 60601-1 (safety) and IEC 60601-1-2 (EMC). Therefore, modules may be used in different kinds of medical devices without any additional filtration and safety measures, at the same time for the proven compliance to standards for a certain modification the certification procedure is need to be passed, which is available on demand.


200-240 V AC, 50/60 Hz
or 100-240 V AC, 50/60 Hz
< 3 A


Maximum power ( P max )
150, 250 or 400 W
Maximum current ( I max )
selectable in range
5 … 75 A (LDD-150)
or 10 ... 100 A (LDD-250 and LDD-400)
Maximum voltage ( V max )
should be less than P max / I max
Rise/fall time
< 1 ms (10% to 90% full current),
< 500 μs on request
Current regulation accuracy
< 1% of I max
Current value error
< 1% of I max
Current overshoot
< 1% of I max
> 80%


PFC value
> 0.98 (active)
Leakage current
< 150 μA
Safety approval (on request)
IEC60950, IEC60601-1
Case fault voltage
4000 VAC
EMC approval (on request)
IEC 60601-1-2 or EN 55011/CISPR 11


15 Pin "D"-Sub Female
Current program
analog, 0-10 V
Current monitor
analog, 0-10 V
Voltage monitor
analog, 0-10 V


Operating temperature
0 … +40 °C
Storage temperature
-20 … +60 °C
0 ... 90%, non-condensing


Size (LxWxH)
225x181x68 mm
1.8 kg

We offer these diode drivers in several modifications with different maximum output currents and voltages.

First of all maximum output power should be chosen (150, 250 or 400 W). Then maximum output current should be selected in range of 10 … 100 A (5 … 75 A for 150 W). Maximum output voltage should be chosen less than Pmax / Imax.


Download user manual (0.8MB)