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20 Amp, 55 Volt High Voltage Pulsed and CW Laser Diode Driver

  • Schulz Electronics Model LDDP Laser Diode Driver
  • Pulsed Waveform Laser Driver Oscilloscope Image
  • Pulsed Waveform Laser Driver Oscilloscope Image

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sku / item#: RLS/LDDP2055
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Key Features
  • CW Output current up to 20 Amps
  • Output Voltage up to 55 Volts
  • Total Output Power up to 1 kW
  • Typical Rise/Fall Time 200 μs
  • Optimized for Fiber Laser Amplifiers and Laser Burn-In Systems with Multiple Single Emitter Strings
  • Very Low Current Ripple/Noise < 0.25 %
  • Efficiency up to 99%

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Key Specifications
  • Current Output: 0 ~ 20 Amps
  • Compliance Voltage Range: 0 ~ 55 Volts
  • Rise/Fall Time: 200 μs (50 μs available with -HS option)
  • Current Ripple (typ): < +/- 0.25%
  • Analog Input Current Programming: 0 to 10V = 0 to 20A
  • Current Programming Accuracy (typ): Better than +/- 2%
  • Efficiency (typ): 98%
Laser Diode Protection Features
  • Start Sequence Monitor
  • Soft Start
  • Transient Protection
  • Over-Voltage Protection
  • Over-Temperature Protection
  • Over-Current Protection
  • Fast Shut-Down Time: <1 μs
User Control Interface
  • Analog Connector: JST 16 pin
  • Digital: RS485, USB
Power Supply Input
  • 48 VDC, (allowed range 24V ~ 52V)

Product Overview:

- Current Range up to 20 Amps
- Compliance Voltage up to 55 Volts
- Buck/Boost - wide output voltage range
- PULSED and CW Modes of Operation
- Rise Times to <50 μsec

The model LDDP-20-55 pulsed and CW high power laser diode driver is designed to supply laser diode strings of multiple single emitters in series. Its unique buck/boost switching topology allows DC/DC operation with load compliance voltage even exceeding the DC input voltage: Standard diode drivers with buck converter require a load voltage for minimum ca. 2 V below the supply input.

The LDDP can supply loads from 0 .. 55 Volts from a DC input between 24 .. 52 VDC as long as the input current does not exceed 25 Amps. This allows system designers to keep using common low cost 24 V auxiliary supplies even though common laser diodes can exceed the 30 V compliance voltage level yet. The LDDP offers fast analog regulation. The up to 99 % highly efficient switching regulation provides pulses or up to 100 % amplitude modulation with typ. 200 µs rise/fall times. An even faster high speed model (-HS) with typ. rise/fall times <50 µs and analog modulation to >20 kHz is optionally available.

Besides standard industrial and medical use, its low current ripple/noise makes it especially suitable for sensitive pumping applications. The standard model provides differential signal I/Os for all digital and analog signals. A 10-pin interface option (-10P) provides common GND w/ differential setpoint input.

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