Wavelength Electronics WLD33ND, Техническое описание и руководство по эксплуатации

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WLD SERIES LASER DIODE DRIVERS
ADDITIONAL TECHNICAL
INFORMATION
This section includes useful technical information on these
topics:
• Noise Reduction
• Improve Temperature Coefficient with the
WLD33ND-EV Evaluation Board
• Using the WLD33ND-HB with the WLD33ND-EV
Evaluation Board
• Bandwidth Optimization with the WLD33ND-EV
Evaluation board
• Thermal Management Kits
• Safe Operating Area Calculation
• WLD33ND-EV Evaluation Board Schematic
NOISE REDUCTION
For lowest noise, operate in Constant Current mode with
the cathode of the laser diode grounded (Type C).
If you buy a special low-noise version of the WLD33ND
(WLD33ND-2L, or WLD33ND-3L for 3 A output), you can
decrease noise by a factor of 2.5 under the same conditions.
Note that you can only operate in Constant Current mode
with the WLD33ND-2L and WLD33ND-3L.
IMPROVE TEMPERATURE COEFFICIENT WITH
THE WLD33ND-EV EVALUATION BOARD
To achieve better stability, use the external setpoint input
rather than the onboard setpoint trimpot.
USING THE WLD33ND-HB WITH THE
WLD33ND-EV EVALUATION BOARD
To operate with 3.3 V input, use the WLD33ND-HB. Note
that maximum output current at this supply voltage is
170 mA (200 mA range) or 1.7 A (2 A range).
BANDWIDTH OPTIMIZATION WITH THE
WLD33ND-EV EVALUATION BOARD
To improve bandwidth, shorten the cables. Expect 1.8 MHz
at 200 mA and 850 kHz at 2 A (sine wave 3 dB point) with
factory-length cables.
POWER SUPPLIES AND NOISE
The WLD drivers deliver stable current with low noise, but
the chosen power supply will directly influence the noise
performance of the driver.
We recommend using a regulated linear power supply for the
best noise performance, but depending on the application
requirements, a switching power supply may be acceptable.
Each case must be evaluated, because a switching power
supply will affect noise, transient, and stability performance.
Wavelength offers several switching power supplies that
may be appropriate.
MODEL MAX VOLTAGE MAX CURRENT
PWRPAK-5V 5 V 6 A
PWRPAK-7V 7 V 3 A
PWRPAK-9V 9 V 3 A
PWRPAK-12V 12 V 2.5 A
Table 12. Available power supplies.
THERMAL MANAGEMENT KITS
The WLD Series of laser diode drivers have customized
thermal kits available. Available kits are:
• WEV300, includes
»
WTW002 thermal washer
»
WHS302 heatsink
»
WXC305 screw kit
• WEV301, includes
»
WTW002 thermal washer
»
WHS302 heatsink
»
5 V fan
»
WXC305 screw kit
• WEV302, includes
»
WTW002 thermal washer
»
WHS302 heatsink
»
12 V fan
»
WXC305 screw kit