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LP8866-Q1: Vf difference, dimming, and reset questions.

Sean Rauchfuss
Intellectual 1025 points
Part Number: LP8866-Q1

Posting for a customer:

  • When using a boost configuration for RGB LEDs with the LP8866, what is the recommended way to account for the Vf being different on RGB? Can they provide a description of what is typically done?
    • Another way to ask it is, what is the range of the 6 current sources? How much Vf difference can they adjust to and how much power can they handle?
  • On the LP8866, does the PWM input need to be used for dimming or can this be handled by I2C commands?
  • What is the recommended way to do a hardware reset on the LP8866? Is there a I2C command to accomplish this? Or is control of the enable needed?

Can you help us out here ? We need a quick response if possible. 

We are using this TI chip to drive between 38 to 40 RGB LEDs using I2C protocol.

  • 0
    TI__Mastermind 31255 points

    Hi, Sean

    Here is the feedback for your questions.

    When using a boost configuration for RGB LEDs with the LP8866, what is the recommended way to account for the Vf being different on RGB? Can they provide a description of what is typically done? 

    It looks a new EE for LP8866, does customer need to independent control for each channel? What is the input voltage range and the Vf for RGB?

    Another way to ask it is, what is the range of the 6 current sources? How much Vf difference can they adjust to and how much power can they handle?

    LP8866 is the boost + 6 current sink, the range of current sink is 0~200mA.

    The main concern is the power consumption, I can help to calculate after you provide the spec.

    On the LP8866, does the PWM input need to be used for dimming or can this be handled by I2C commands?

    Dimming can be handled by I2C commands without PWM input.

    What is the recommended way to do a hardware reset on the LP8866? Is there a I2C command to accomplish this? Or is control of the enable needed?

    LP8866 can be reset by EN pin.