the pulse of the future directed energy incorporated PCO-6130 pulsed/cw laser diode driver module ? economical oem module ? 0a to 125a output ? 20v maximum output voltage ? 2.5kw maximum average output power ? user-adjustable variable rise time ? <600ns to dc pulse width ? repetition frequency single-shot to 250khz ? current monitor output the PCO-6130 is a compact, oem-style high power pulsed current source designed to drive diode lasers, bars and arrays in pulsed, qcw or cw modes. it delivers out- put current variable from 1a to 125a, pulse widths variable from <600ns to dc, and pulse repetition frequencies variable from single-shot to 250khz at duty cycles up to 100%. the PCO-6130 features a user-adjustable variable rise time control. this innovative feature allows the user to ad- just the rise time within a range of <200ns to >5s by means of a pcb-mounted potentiometer, to optimize the driver?s rise time for the user?s application. the PCO-6130 is based on a hysteretic, average current, switch-mode regulator. this type of regulator is a variable frequency, variable pulse width design which maintains current in an energy storage inductor between a minimum and maximum level. the ripple is limited to the minimum and maximum current determined by the hysteretic con- troller. the regulator is started when the ttl "enable" line is taken high and runs as long as the enable is high. the use of the hysteretic regulator provides a large input range and high efficiency. a shunting switch shorts the output of the regulator until output current is needed. the pulse is generated by opening the shunt switch for the length of the input pulse. the pulse rise and fall times are then limited only by the stray/parasitic capacitance and inductance of the shunting switch and output leads. no power is dissipated in the driver until it is enabled. when enabled, at 125a maximum output approximately 75w is continuously dissipated in the driver to maintain the current in the energy storage inductor (see note #1 on next page for more information). this architecture provides a high performance driver in a small form factor, with high operating efficiency and low stored energy. at 125a output current, the stored energy in the driver is approximately 7 joules, dramatically lower than the stored energy in comparable linear current sources. the PCO-6130 requires user-supplied +24vdc support power, a cmos (+5v) gate signal, and a ttl-level en- able/disable signal. the high current output is derived from the +24vdc dc input. the output pulse width and frequency are controlled by the gate signal. the output current amplitude is controlled by a pcb-mount potenti- ometer. a current monitor output may be viewed with an oscilloscope, providing a straight-forward means to ob- serve the diode current waveform in real-time. to protect the laser diode and the driver, circuitry is in- corporated into the driver that disables the output if the +24vdc support power drops below 18v. clamp diodes are incorporated into the output network to protect the laser diode against reverse voltage conditions. the PCO-6130 is available in two options. option a is mounted on an air-cooled heatsink. option b (pictured above) is provided without the heatsink, and must be mounted to a user-supplied heatsink or cold plate capa- ble of dissipating approximately 100w. the rugged, compact design and high power capability of the PCO-6130 make it an excellent oem choice for driv- ing high power laser diodes.
the pulse of the future directed energy, inc. an ixys company 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 doc #9200-0225 rev 2 ? 2001 directed energy, inc. typical output waveform 25us pulse width, 120a output (5 s/div horizontal scale, 20a/div vertical scale) parameter value pulse output current amplitude range 0a to 125a means of adjustment trimpot mounted on pcb, or external 0-5v or 0-10v analog voltage program, jumper-selectable output polarity positive pulse rise time variable from <200ns to >5s (10%-90%) , user- adjustable through trimpot mounted on pcb pulse width <600ns to dc pulse recurrence frequency range single shot to 250khz maximum duty cycle 100% output pulse ripple/droop <2% at 125a output, 10 s pulse width over/undershoot <5% jitter <3ns first sigma efficiency >75% at 50% duty cycle, 125a output (1) output connector high current dsub, pcb-mounted diode forward voltage amplitude 20v maximum gate input type positive edge trigger gate input +5v cmos current monitor output current monitor 1000a/1v terminated into 50 ?, 3% of the actual current current monitor connector smb, pcb-mounted control functions output enable/disable ttl input, high = enabled input power +24vdc unregulated (2) operating temperature 0c to 40c cooling option a (with heatsink): air cooled (3) option b (without heatsink): cold plate capable of dissipating ~75w at 125a output current (1) dimensions (h x w x d) option a: 6? x 8? x 2.7? (15.2cm x 20.3cm x 6.9cm) option b: 6.25? x 8? x 1.5? (15.9cm x 20.3cm x 3.8cm) specifications are subject to change without notice general <200ns rise time, <600ns fall time, 120a output (500ns/div horizontal scale, 20a/div vertical scale) <600ns minimum pulse width, 120a output (500ns/div horizontal scale, 20a/div vertical scale, measured at the load) specifications 250khz frequency, 120a output (2.5 s/div horizontal scale, 20a/div vertical scale) (1) at 125a output, the driver dissipates ~75w when enabled but not pulsing. efficiency is therefore the ratio of output power to the idle power consumption. the idle power consumption varies non-linearly with output current, and can be approximated by the formula p=i 2 x 0.005 where i is the output current. for example, at 75a output current, the idle power consumption is 75 2 x 0.005 = 28w. (2) the +24vdc support power should be sized for the average output power (power x duty cycle) plus the idle power consumption, as defined above. (3) model number PCO-6130 option a is mounted on an air-cooled heatsink. option b requires a customer-supplied heatsink or cold plate capable of dissipating ~75w (when the driver is operated at 125a output, see #1 above).
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