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DLPA2005: Question about VLED BUCK-BOOST

Hyungsung Kim
Prodigy 10 points
Part Number: DLPA2005
Other Parts Discussed in Thread: DLPA3005

Hello

I have question about VLED Buck boost of DLPA2005.

The datasheet of DLPA2005 states that the LED forward voltage is max 4.55V.
I want to use an LED with a forward voltage of 8V.
Is it possible to use it by adding an external circuit?
If possible, please answer how to design the circuit.

Regards,

Hyungsung.

  • 0
    TI__Expert 3425 points

    Hello user,

    Thank you for your interest in DLP technology.

    We will discuss with the internal team and get back to you next week.

    Thank you,

    John

  • 0
    TI__Genius 12575 points

    Hello Hyungung,

    The VLED signal on the DLPA2005 is rated up to 7V as an absolute maximum. Unfortunately, the DLA2005 has not been tested to support circuitry outside of our reference designs to drive the LEDs. However, the DLPA3005 is designed specifically to drive external FETs for LED's requiring more power. I would suggest you consider using the DLPA3005 as an alternative to the DLPA2005.

    Kind regards,

    Austin

  • 0 in reply to Austin Snyder
    Prodigy 10 points

    Hello

    the LED Anode Voltage value is Max 6.3V in datasheet of DLPA3005.

    If the LED Anode Voltage is boosted by an external circuit, isn't there a problem in the feedback circuit?

    Thank you,

    Hyungsung

  • 0 in reply to Hyungsung Kim
    TI__Genius 12575 points

    Hello Hyungsung,

    I do not believe this should pose an issue, but I will discuss with our team to confirm.

    Regards,

    Austin

  • 0 in reply to Austin Snyder
    Prodigy 10 points

    Hello Austin

    Thank you for your reply. 

    And please discuss below with your team.

    Is it possible to use external power for DLPA2005 as shown below?
    Which one would be possible?

    Regards,

    Hyungsung

  • 0 in reply to Hyungsung Kim
    TI__Genius 12575 points

    Hello Hyungsung,

    The DLPA2005 has not been validated to drive external circuitry as you have depicted above. With that in mind I cannot recommend either configuration.

    Alternatively, I would suggest exploring the using a DLPA3005 to drive your higher forward voltage. I have heard back from our hardware team. They have confirmed that the feedback pin and devices on this net are rated for higher than 8V so there should be no concern about damaging the feedback circuit.

    There are, however, other considerations that should be taken into account when designing for this higher voltage. One being that firmware geared for higher forward voltages. These are available through the Firmware Selector Tool by selecting the DLPA3005_SeriesLED option after the correct controller has been selected.

    It would be ideal to discuss the other design considerations off of this E2E forum. To do so, please accept my friend request so that we may begin a direct message conversation.

    Regards,

    Austin

  • 0 in reply to Austin Snyder
    Prodigy 10 points

    Hello

    I accepted your friend request and asked some question.

    Check please

    Regards,

    Hyungsung

  • 0 in reply to Hyungsung Kim
    TI__Genius 12575 points

    Hello Hyungsung,

    I have just sent a message to you directly. Thank you for your patience on this reply.

    Since we are continuing our conversation elsewhere, I will be closing this E2E thread.

    Regards,

    Austin