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LP5813: Are there any devices with a boost function that support 6-channel individual control?

Kyohei
Expert 1440 points
Part Number: LP5813
Other Parts Discussed in Thread: LP8556, LM3535

Tool/software:

Hi team,

Are there any LED drivers with the following specifications?

  • Boost function (3.3V to 5V)
  • 6-channel individual control
  • Control current: 30mA
  • Current device: ADP8861ACPZ (ADI)

I could only find devices like the LP5813, which supports 4-channel individual control. Are there any devices that support 6-channel individual control?

Is the LP8556 usable with the above specifications?

Best regards,

  • 0
    TI__Mastermind 34780 points

    Hi Kyohei,

    Our expert will give you reply later.

  • +1 in reply to Patrick Yao
    TI__Expert 5610 points

    Hi Kyohei,

    LP5813 can be configured as below to support 6 LEDs with max 25.5mA average current per led and individual control.

    Best regards,

    Felix

  • 0 in reply to Felix Wang
    Expert 1440 points

    Hi Felix,

    My customer is considering using the LP5813 for 6-channel individual control.

    The usage involves two circuits, each lighting up R, G, and B LEDs respectively, making a total of 6 LEDs (3×2).

    The method is to light up R → G (R off) → B (G off) → R (B off) in microseconds.

    The current values are not changed from the initial settings.

    Additionally, the current values for each RGB LED are different.

    When using the LP5813 in matrix control, is it possible to individually control 6 channels with different current values for each LED?

    Best regards,

    Kyohei

  • +1 in reply to Kyohei
    TI__Expert 5610 points

    Hi Kyohei,

    Yes, the maximum current and pwm value of each dot can be controlled individually through corresponding separate registers.

    Best regards,

    Felix

  • 0 in reply to Felix Wang
    Expert 1440 points

    Hi Felix,

    Thank you your response.

    Is it possible to light all six LEDs simultaneously with the above connection?

    I think it is possible to light them by column with this connection, but it might be difficult to keep all six LEDs lit simultaneously for one second.

    It is possible to make them appear lit to the human eye using PWM, right?

    Best regards,

    Kyohei

  • 0 in reply to Kyohei
    TI__Expert 5610 points

    Hi Kyohei,

    Yes, the 6 LEDs can be turned on "simultaneously".

    Yes, use PWM.

    Though, in reality, the 6 LEDs will be lighted up in turn (LED_A0/1/2 to LED_B0/1/2 to LED_A0/1/2 to...), but the scan frequency is relatively high that is 24KHz. As a result, it appears lit to the human eye.

    Best regards,

    Felix

  • 0 in reply to Felix Wang
    Expert 1440 points

    Hi Felix,

    Thank you for your response.

    Understood.

    Can the LP5813's analog dimming feature be used to maintain the state of six LEDs?

    The customer intends to use the sensor input, so it seems difficult to consider unless six LEDs actually light up simultaneously.

    • Boost function (3.3V to 5V)
    • 6-channel individual control
    • Control current: 30mA
    • Current device: ADP8861ACPZ (ADI)

    Is there an LED driver that meets the above requirements for lighting six LEDs simultaneously? Would LM3535 be suitable?

    Best regards,

    Kyohei

  • 0 in reply to Kyohei
    TI__Expert 5610 points

    Hi Kyohei,

    No, the analog dimming is modifying the maximum current but as the LP5813 works in 2 scans mode, so the LEDs on the two scan lines (OUT0 and OUT1) still light up in turn.

    Yes, the LM3535 is a recommendation. LP5569 is another recommendation, which has the animation engine control function as LP5813 has. 

    Best regards,

    Felix