Wavelength Electronics WLD3343 Datasheet And Operating Manual

Contents

Wavelength Electronics WLD3343 Datasheet And Operating Manual Manual pdf 25 page image

© 2018www.teamWavelength.com 25WLD SERIES LASER DIODE DRIVERSTROUBLESHOOTINGPROBLEM POTENTIAL CAUSES SOLUTIONSDriver will not switch on Improperly configured powersupplyStandalone: Carefully check the wiring diagram according topage 13 and page 14.Evaluation Board: See page 18 for details regarding power supplyconnections.Output will not enable ENABLE pin not held lowStandalone: Refer to the SHD pin specifications in Table 1 andmake sure this pin is held at zero volts or left floating.Evaluation Board: Ensure that the ENABLE switch is fully rockeredto the ON position.Laser output power toolow in Constant CurrentmodeLaser current setpoint too lowIncrease the setpoint by increasing the voltage at Pin 2 (V SET).Evaluation Board: The setpoint can be increased using the onboardSET trimpot, and/or using the SET input on the terminal strip.Laser current limit too lowStandalone: Refer to page 11 for instructions on setting the laserdriver current limit.Evaluation Board: Refer to page 19 for instructions on setting thelaser driver current limit.Laser driver is compliancelimitedCheck the laser diode specifications to determine the forwardvoltage (V F). Make sure that the WLD is not compliance limited.Refer to the Electrical Specifications table on page 6. If thedriver is compliance limited, V DD may need to be increased.Verify that the WLD will be operating within the Safe OperatingArea if V DD is increased.Laser does not reachdesired output inConstant Power modePhotodiode feedback currentis out of range for the WLDRefer to the laser diode datasheet to determine the approximatephotodiode (PD) current at the desired output power level. If the PDcurrent exceeds the chosen WLD photodiode current range, either:Standalone: see page 12 for instructions on how to properly setthe photodiode current range by choosing R PD .Evaluation Board: see page 17 for instructions on how to increasethe PD RANGE jumper value.Modulation is not working VSET improperly configuredStandalone: See page 15 for details for modulating using V SET.Evaluation Board: See page 20 for proper evaluation boardconfiguration for modulation.Cannot zero the trimpotsEvaluation Board: The trimpots that are installed on theWLD3393 are 12-turn trimpots. This means that after 12 full turnscounterclockwise, they will be set to zero, even though they will turncontinuously.Photodiode feedback isinaccurateImproperly configured RPD orPD RANGE jumperStandalone: see page 12 for instructions on how to properlychoose the photodiode current range by choosing R PD .Evaluation Board: see page 17 for instructions on how to changethe PD RANGE jumper value.Transfer functions areinaccurateImproperly configuredCC/CP ModeIf CC/CP Mode is improperly configured, this can lead toinaccuracies in the transfer functions.Standalone: See page 13 or page 14 for proper wiringdiagrams.Evaluation Board: Make sure the MODE switch is fully rockered tothe desired operating mode.

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