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DLD-127A

40A CW & QUASI-CW LASER DIODE DRIVER/CURRENT SOURCE

Directed Energy, Inc. An IXYS Company 

DLD-127A

THE PULSE OF THE FUTURE

40A CW & QUASI-CW LASER

DIODE DRIVER/CURRENT SOURCE

The DLD-127A is a 400 watt laser diode driver/current

source designed to drive laser diodes and other low-

impedance 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 ≤50µs 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

• Output Current 4A To 40A

• Output Voltage Up To 10V

• Pulse Width < 50µs to DC

• Rise Time ≤ 25µs

• Analog Modulation to 10KHz

• Constant Current Or

Constant Power Control

• High Efficiency

• OEM Module

current and voltage are also compared to the internal and

external over-current setpoints, and to the internal over-

voltage setpoint, to determine an over-current or over-

voltage 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 over-

current 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

100µs/Div Horizontal Scale, 10A/Div

Vertical Scale (Bottom Trace)

40A Output Waveform

250µs/Div Horizontal Scale, 10A/Div

Vertical Scale

34A Analog Modulation @ 1KHz

(18A Bias, ±17A Modulation)

Top Trace = Input Signal

Bottom Trace = Output Current

250µs/Div Horizontal Scale, 10A/Div

Vertical Scale (Bottom Trace)

DIRECTED

ENERGY

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