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THE PULSE OF THE FUTURE
DLD-127A
40A CW & QUASI-CW LASER DIODE DRIVER/CURRENT SOURCE
* * * *
Output Current 4A To 40A * Output Voltage Up To 10V Pulse Width < 50s to DC Rise Time 25s
Analog Modulation to 10KHz * Constant Current Or Constant Power Control * High Efficiency * OEM Module
The DLD-127A is a 400 watt laser diode driver/current source designed to drive laser diodes and other lowimpedance loads at up to 10 volts and 40 amps. It is optimized for diode pumping of solid state lasers, illumination, and other high power applications. The DLD-127A can be operated continuously (CW), pulsed (Quasi-CW) or can be analog modulated by an external analog modulation input. It can generate output pulse widths of 50s to DC at up to 10KHz, with an analog modulation bandwidth of 10KHz. The DLD-127A can be operated in either laser current (constant current) or optical power (constant power) control modes. The control mode is user-selectable, and signals to monitor the output current are available through the user interface connector. In constant power control mode, a user-supplied photodiode may be connected to the DLD-127A to provide optical feedback to control the current source through the on-board photodiode amplifier. In constant current control mode, the laser current is monitored, and controls the driver output. The output current and voltage are also compared to the internal and external over-current setpoints, and to the internal overvoltage setpoint, to determine an over-current or overvoltage fault. Designed for OEM applications, the DLD-127A derives its high current output from a 24VDC to 48VDC input DC power supply, and +5VDC and 15VDC support power. The analog modulation and output current setpoints are controlled by 0-10V analog inputs. The driver is a high efficiency switch-mode current source. This architecture provides an efficiency greater than 75%, minimizing power dissipation and cooling requirements. Safety features include a power up reset hardware delay, driver power-on indicator, laser over-voltage and overcurrent faults, and a driver over-temperature fault. The DLD-127A is provided on an air-cooled heatsink, ready for installation and assembly in OEM applications.
20A Analog Modulation @ 5KHz (20A Bias, 10A Modulation)
Top Trace = Input Signal Bottom Trace = Output Current 100s/Div Horizontal Scale, 10A/Div Vertical Scale (Bottom Trace)
40A Output Waveform
250s/Div Horizontal Scale, 10A/Div Vertical Scale
34A Analog Modulation @ 1KHz (18A Bias, 17A Modulation)
Top Trace = Input Signal Bottom Trace = Output Current 250s/Div Horizontal Scale, 10A/Div Vertical Scale (Bottom Trace)
DIRECTED ENERGY INCORPORATED
THE PULSE OF THE FUTURE
SPECIFICATIONS (Measured at 40A, 10V output)
PARAMETER Laser Diode Controller Voltage Polarity Maximum Output Voltage Current Range Maximum Duty Cycle Pulse Width Pulse Rise Time/Fall Time Depth Of Modulation Droop Overshoot Undershoot Ringing (Pulse Mode) Output Power Stability Temperature Coefficient Efficiency External Modulation Input Input Signal Bandwidth Transfer Function Control And Monitor Inputs Reset Current Limit Laser Diode Enable Control And Monitor Outputs Output Current Monitor Laser Over Current Fault Laser Over Voltage Fault Over Temperature Fault Driver Power On Driver Fault Photodiode Amplifier Photodiode Amplifier Output Photodiode amplifier gain Photodiode bias voltage Bandwidth Limit General Operating Temperature Range Power Requirements Cooling Requirements Dimensions (W x L x H, including heatsink) Weight (Including Heatsink)
SPECIFICATIONS SUBJECT TO CHANGE WITHOUT NOTICE (1) The DLD-127A will operate on any voltage from 24VDC to 48VDC, however the maximum output voltage with 24VDC input is 5V. To obtain the full 10V output, 48V input is required.
VALUE Positive with respect to ground 10V @ 40A 0A to 40A 100% 50s to DC, controlled by modulation input Controlled by modulation input, minimum rise and fall time is 25s, maximum bandwidth is 10KHz 90% @ 1KHz, 50% @ 5KHz, 20% @ 10KHz <1% <5% maximum, typically <2% <2% <5% 0.5% over 24 hours at full power, measured at 25C with temperature variation <0.5C into a resistive load 250ppm/C from 0C to 40C >75% 0 to +10V DC to 10KHz 4000mA/V TTL into 50 to reset driver faults 0-10V Analog Voltage Setting, range of 4A to 40A TTL into 1k Ohm, High=Enabled 4A/V into 1M Open collector output, 50mA max current sink, Low=Fault, Imax + 10% latches off driver Open collector output, 50mA max current sink, Low=Fault, Vmax + 10% latches off driver Open collector output, 50mA max current sink, latches off driver Driver Power Indicator, Open collector output, 50mA max current sink, Low=Fault Open collector output, 50mA max current sink, Low=Fault, latches off driver 0 to 10V output Adjustable 10V 100KHz 0C to +40C 48VDC @ 12A (1) ; 15VDC @ 0.25A; +5VDC @ 0.5A Forced Air, 100 CFM, max air temperature 40C 4" x 12" x 3" (102mm x 305mm x 76mm) 51 Ounces (1.45 Kilograms) 9200-0206 REV 1
Noise and Ripple (After initial edge, steady state) 1%
Directed Energy, Inc. 2401 Research Blvd., Suite 108 Fort Collins, CO USA 80526 970-493-1901 Fax: 970-493-1903 Email: deiinfo@directedenergy.com Web: http://www.directedenergy.com

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