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LDQPC QUASI-PULSED LASER DIODE DRIVER

The LDQPC quasi-pulsed laser diode drivers are specifically designed for low cost high volume applications. These DC input modules are avail- able with average output power to 75 watts and current output to 200 amps. With a rise/fall time of <10us. they are ideally suited for compact short pulse laser applications. All configurations require 15 or 24volts DC and feature a simple analog interface. Output current and voltage can be specified to meet your requirements.

Built around the same topology that has made Lumina Power laser diode drivers the standard of the industry, these board level products offer the reliability and diode protection of the larger LDQCW series in a compact easy to integrate package.

FEATURES • 75 Watts Average Power • 10us. Rise/Fall Time • 200 Amps Peak Output • RoHS Compliant • Analog Interface

APPLICATIONS • Medical Laser Systems • Mobile Lasers • Pulsed R&D Applications

Specifications

INPUT
Input Voltage:	+15 or 24VDC
OUTPUT
Output Power:	75 watts average
Ipulsemax:	200A peak
Iavgmax:	80A
Vcompliancemax:	Configurable up to 10V
INTERFACE
Interface Connector:	15 Pin “D” Sub Female
Pulse Enable:	+5V TTL to +15V CMOS
Current Program:	0-10V for 0-Ioutmax
Current Monitor:	0-10V for 0-Ioutmax
Voltage Monitor:	0-10V for 0-Voutmax
PERFORMANCE
Pulse Width Range:	20usec to 2msec
Max Rep Rate:	10kHz
Rise/Fall Time:	10uSec
Current Regulation:	1.0% of max. output current
Current Ripple:	<0.5% of max. output current
Current Overshoot:	<5% of max. output current
Power Limit:	Limited to maximum average power with power fold-back circuit
ENVIRONMENT
Operating Temp:	0 to 40°C
Storage:	-20 to 85°C
Humidity:	to 90% non-condensing
Cooling:	Forced air MECHANICAL
Dimensions:	See Drawing
Part Number Description:	LDQCW-XX-YY-ZZ XX= Current, YY = Compliance Voltage, ZZ=maximum pulse width
Example:	LDQCW-100-6-100us. This configura- tion is a 100amp peak, 6 Volts compliance and the maximum pulse width will be 100us.

Note: Special input and output voltage configurations are available. Please contact Lumina Customer Service or your local representative for more information.

Interface Configuration

Pin	Function	Description	Impedance
1	Enable	5 to 15V=Enable Output, Default OFF	10.0K
3	Interlock	Open = Off Ground to pin 4 or 9 = Run, Pin can be used for safety switches such as door interlock or temp switch.	10.0K
4, 9	Gnd
5	V out Mon.	0 to 10V = 0 to full scale output voltage	1.0K
6	I out Mon.	0 to 10V = 0 to full scale output current	1.0K
7	I Program	0 to 10V = 0 to Full scale	10.0K
8	Pulse Control	TTL High = On, TTL Low = Off, Default= Off
No connections to pins: 2, 10, 11, 12, 13, 14 & 15

Board Layout

Recommended Fan: 60mm x 60mm Sanyo Denki: # 109R0624J402 or equiv

Proper cooling of the LDQPC board is critical to the operation and reliability of the product. The diagram above shows the fan positions and required airflow for the various output currents. The fan must be positioned as close to the board as possible to properly cool the heatsinks. Note: Failure to properly cool the board using the correct size and position of the fans may result in thermal shutdown and potential catastrophic damage to the power supply. Damage to the board from inadequate cooling is not covered under warranty

Typical Waveform

The LDQPC supplies are designed for pulsed operation and have a very short rise/fall time. The waveform shown is a scope trace of a 70 amp 

pulse with a rise time of 10µs. Rise times vary depending upon output voltage and current. For pulsed diodes applications where compliance 

voltages are greater than 10V the LDQCW pulsed laser diode drivers are available with output currents to 200 amps and compliance voltages to 100V.