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DLPA3000: How to set the work voltage?

Part Number: DLPA3000

Hi, Sir,

DLPA3000 system power is 6~22V,

how can i set the system power can work at 6.5V, thanks!

  • Hello Ray,

    Thank you for your interest in DLP products. Please note the following:

    1. Based on the DLPA3000 datasheet  the system power range is 6~20V. 

    2. Please take note of the foot note on p.9 of the datasheet regarding your question:

    "VIN must be higher than the UVLO voltage setting, including after accounting for AC noise on VIN, for the DLPA3000 to fully operate. While 6.0 V is the min VIN voltage supported, TI recommends that the UVLO is never set below 6.21 V. 6.21 V gives margin above 6.0 V to protect against the case where someone suddenly removes VIN’s power supply which causes the VIN voltage to drop rapidly. Failure to keep VIN above 6.0 V before the mirrors are parked and VOFS, VRST, and VBIAS supplies are properly shut down can result in permanent damage to the DMD. Since 6.21 V is 0.21 V above 6.0 V, when UVLO trips there is time for the DLPA3000 and DLPC343x to park the DMD mirrors and do a fast shut down of supplies VOFS, VRST, and VBIAS. For whatever UVLO setting is used, if VIN’s power supply is suddenly removed enough bulk capacitance should be included on VIN inside the projector to keep VIN above 6.0 V for at least 100us after UVLO trips."

    Are you working with an optical engine manufacturer? If so, please contact the optical engine manufacturer for required firmware updates to work with 6.5V system power. 

    Hope this helps.

    Best,

    Sepeedah

  • i found a solution for the issue, please help check why?

    Now, my Vin Cap is 22uF*2, the VIn Minimum just support 8V,

    when i use 680uF*3, it's can work at 6.8V,

    why need use more and more Vin Cap let support 6.8V? thanks!

  • Hello Ray,

    Adding more capacitance will keep your VIN voltage stable for a longer period of time. It also helps with any noise you have on the VIN supply.

    I would recommend to look at the VIN voltage with the two different Cap configuration on a scope. I would also recommend to check with your optical engine manufacture on the UVLO setting.

    If you have any noise which goes below the UVLO setting the UVLO is getting triggered.

    Best regards,

    Nadine