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LP5520:

Nick Hsu
Prodigy 10 points
Part Number: LP5520

Hi Sir
We would like to apply LP5520 to do color sequential lighting for LCOS display. The target maximum driving current would be 25mA for each channel.

The reference circuit as follows.

We have 8pcs red LED string on red channel, 4pcs green LED string on green channel, 4pcs blue LED string on blue channel. We will do manual PWM control for RGB lighting.

There are some question for clarification.

1. Does LP5520 support different boost voltage for RGB lighting?

2. Manual PWM control for RGB and frquency up to 360Hz. Is it available?

  • 0
    TI__Mastermind 20515 points

    Hi Nick,

    Please refer the below comments:

    1. Does LP552 support different boost voltage for RGB lighting?

    [Jared]: I think LP5520 can't support this function.

    2. Manual PWM control for RGB and frequency up to 360Hz. Is it available?

    [Jared]: Yes, it is.

    BR, Jared

  • 0 in reply to Jared Zhou
    Prodigy 10 points

    Hi Jared

    For question 1, we use color sequential control for separated RGB  LED. That means we have different boost voltage for R LED  tring, G LED sring, B LED string. Please help to double check if it is available.

    thx.

  • 0 in reply to Nick Hsu
    TI__Mastermind 20515 points

    Hi Nick,

    Do you mean you will turn on R LED string, G LED string, B LED string in different time? If yes, I think you can set different boost output voltage in different time to meet your requirement.

    Since I will be OoO next Monday, I will check it again and give you a definite reply later.

    BR, Jared

  • 0 in reply to Jared Zhou
    Prodigy 10 points

    Hi Jarred

    Have you confirmed this idea?

  • 0 in reply to Nick Hsu
    TI__Mastermind 20515 points

    Hi Nick,

    Sorry to late reply.

    If you mean only one color will be on at the same time, then I think you can set the boost output voltage at different time through interface.

    BR, Jared