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DLPA3000: DLPA3000 broken-LED_ANOD with GND short

Part Number: DLPA3000
Other Parts Discussed in Thread: DLP3010, DLPC3478,

Dear Sir:

Experimental environment:

1.DLP3010+DLPA3000+DLPC3478

2. DLPA3000 burned down, LED_ANOD and ground short circuit after power input

3. When only connected with the blue lamp, RED_alloying and GRN_alloying are not suspended


Question:

1. What caused the burn down?Whether the BLU_ALLOYING, RED_ALLOYING, GRN_ALLOYING cannot be floating?

2. What methods can be adopted to avoid burning (only blue lights, red lights and green lights are not used), and what methods can be adopted for software and hardware?

  • Cooper,

    Thanks for your inquiry. Can you elaborate a little further on the circumstances of your problem?

    Is this a custom board you designed, or are you using a TI.com EVM?

    What power supply did you use to power the system?

    What do you mean by "suspended"? Are you saying that the RED and GREEN cathodes were not floating?

    It sounds like you are running the system with only one LED (BLUE). Is that correct? If so, you cannot drive the system with single LED in this manner with default firmware. It is possible to run with custom firmware which disables other LEDs on boot. Is this what you are looking for?

    Regards,

    Philippe Dollo

  • Hi Philippe:

    operation environment:1.DLP3010+DLPC3478;2.after power, DLPA3000 is broken, finding that LED_ANOD short with GND;3. when only connect the blue light-BLU_CATHODE,RED_CATHODE and GRN_CATHODE are not connected,  floating status;

    Question:

    I want to know the reason of DLPA3000 broken, whether BLU_CATHODE,RED_CATHODE,GRN_CATHODE are not in floating status?

    2.can you tell me how to avoid the issue above when I just use blue light,  software and hardware , what I should do ?

     

  • Cooper,

    You will need a firmware build which leaves RED and GREEN LEDS disabled at boot (this is not default). I have sent you a friend request to assist you, so send me a private message once you accept it.

    Regards,

    Philippe Dollo

  • Cooper,

    I see you have accepted my friend request. Marking this thread as resolved and taking the discussion offline.

    Regards,

    Philippe Dollo