PCO-6131 DEI | Alldatasheet
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PCO-6131 Pulsed/CW Laser Diode Driver Module Datasheet For more information: 970.493.1901 or sales@directedenergy.com Document #9200-0225 Rev B1. © Copyright 2019 Directed Energy, Inc. All rights reserved. Precision Pulse Control The PCO-6131 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 output current variable from 1 A to 1 25 A, pulse widths variable from <100 ns to DC, and pulse repetition frequencies variable from single-shot to 500 KHz at duty cycles up to 100%. The PCO -6131 features a user -adjustable variable rise time control. This innovative feature allows the user to adjust the rise time within a range of <30 ns to >2.5 µs by means of a PCB - mounted potentiometer, to optimize the driver’s rise time for the user’s application. The PCO-6131 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 controller. 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 unt il it is enabled. When enabled, at 125 A maximum output approximately 75 W is continuously dissipated in the driver to maintain the current in the energy storage inductor. This architecture provides a high-performance driver in a small form factor, with h igh operating efficiency and low stored energy. At 125 A output current, the stored energy in the driver is approximately 7 Joules, dramatically lower than the stored energy in comparable linear current sources. System Operation The PCO-6131 requires user -supplied +24 VDC support power, a CMOS (+5 V) gate signal, and a TTL -level enable/disable signal. The high current output is derived from the +24 VDC input. The output pulse width and frequency are controlled by the gate signal. The output current amplitude is controlled by a PCB -mount potentiometer. To protect the laser diode and the driver, circuitry is incorporated into the driver that disables the output if the +24 VDC support power drops below 18 V. Clamp diodes are incorporated into the output network to protect the laser diode against reverse voltage conditions. The rugged, compact design and high-power capability of the PCO -6131 make it an excellent OEM choice for driving high power laser diodes. The PCA-9155 optional current monitor is a 0.002 Ohms resistor with a 50 Ohm series termination. When terminated into 50 Ohms, the output is the equivalent of a 0.001 Ohm resistor with scaling of
1000 A/V and can be viewed with an oscilloscope
providing a straight-forward means to observe the diode current waveform in real -time. The resistor is in the negative lead and the BNC shield is connected to the negative out.
Ordering Information
PCO-6131 Diode Driver Module PCA-9160 1-Meter Output Stripline Cable PCA-9155 Optional Current Monitor Board The PCO-6131 is provided with a mating I/O connector and sockets, and a 1-meter output stripline cable assembly.
PCO-6131 Pulsed/CW Laser Diode Driver Module Datasheet For more information: 970.493.1901 or sales@directedenergy.com Document #9200-0225 Rev B1. © Copyright 2019 Directed Energy, Inc. All rights reserved. Pulse Amplitude Output Current Range 0 A to 125 A Means Of Adjustment Trimpot mounted on PCB, or external 0-5 V or 0-10 V Analog Voltage, jumper-selectable. Output Polarity Positive Pulse Rise Time Variable <30 ns to >2.5 µs (10%-90%) , user-adjustable trimpot mounted on PCB Pulse Width <100 ns to DC Pulse Frequency Range Single Shot to 500 KHz Maximum Duty Cycle 100% Output Pulse Ripple/Droop ~2 A, (<2% at 125 A output) Jitter <3 ns First Sigma Efficiency >75% at 50% duty cycle, 125 A output Output Connector High Current DSUB, PCB- Mounted Diode Forward voltage Amplitude 20 V maximum Gate Input Type Positive Edge Trigger Gate Input +5 V CMOS Current Monitor Optional PCA-9155 Current Monitor 1000 A/V terminated into 50 Ω ±3% of the actual current Current Monitor Connector BNC Control Functions Output Enable/Disable TTL Input, High = Enabled General Input Power +24 VDC ±10% unregulated Operating Temperature 0°C to 40°C Cooling Air cooled Dimensions (H X W X D) 8.4 cm x 20.3 cm x 16.5 cm Specifications are subject to change without notice. *The idle power consumption (power consumed when the driver is enabled but not pulsing) varies non- linearly with output current, and can be approximated by the formula P IDLE=I² x 0.023 where I is the output current setpoint. When pulsing, the switching losses (PSW) are about 30 W. Therefore the 24 VDC power requirements can be approximated by the formula PSW + [IOUT VOUT + IOUT²(0.030)]DutyCycle + PIDLE (1- DutyCycle) where VOUT is the diode forward voltage and DC is the duty cycle. For example, at 40 A output current, 10 V diode voltage and 30% duty cycle, the power consumption is 30W + [40A x 10V + 40A² x 0.03] x 0.3 + [40A² x 0.023] x (1-.3) = 190W. The +24 VDC support power should be sized to provide this average power. <30 ns Rise Time, < 750 ns Fall Time, 120 A Output <100 ns Minimum Pulse Width, 125 A Output