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LP8868Y-Q1: LP8868YQDMTRQ1

Michael Feldgen
Prodigy 10 points
Part Number: LP8868Y-Q1
Other Parts Discussed in Thread: LP8865C-Q1

Tool/software:

Dear TI Team,

the topic is Analog Dimming Spec. 7.3.4.2., is there a chance to dimm in a real analog way, it called Analog dimming but it is an PWM dimming. We´re looking to a real voltage level dimming in a small output current window, is there a chance to do that. thanks in advance.

Best Regards Michael

  • 0
    TI__Expert 3151 points

    Hi Michael,

    We simply differentiate dimming methods by the output behaviors in LED driving side. So, for LP8868Y-Q1, the analog dimming is the real analog dimming. It controls a constant output current rather than generate a PWM LED current. But it uses a PWM signal as an input for controlling. 

    Best regards,

    Suchen

  • 0 in reply to Suchen Dong
    Prodigy 10 points

    Dear TI Team, 

    I’ve also reviewed the LP8868 specification. My hope was to find a way to implement simple analog control (Resistor value switch) via the relevant pins in order to reduce costs. Any solution involving PWM—whether through a dedicated controller or a microcontroller—adds to the overall expense. Given that the LP8868 is a relatively low-cost DC-DC converter, I’d like to avoid increasing the design costs unnecessarily. Maybe you can provide a low cost example to drive that pin´s.

    Best Regards Michael

  • 0 in reply to Michael Feldgen
    TI__Expert 3151 points
    Hi Michael,

    Regarding your request, we suggest using our new lost-cost version LP8865C-Q1 for the analog-to-analog dimming function.

    Best regards
  • 0 in reply to Suchen Dong
    Prodigy 10 points

    Hello TI Team, oh, i´m surprised, i know the "old LP8865 with "old" dimming options like the LP8868, the updated one will definetly help, is it planned to change also the LP8868 series.

    Thanks for the feedback

    Best Regards Michael

  • 0 in reply to Michael Feldgen
    TI__Expert 3151 points

    Hi Michael,

    LP8865C-Q1 is a lower-cost device compared with LP8865/8-Q1 family. You can consider it as a new family. So LP8865/8-Q1 will keep the original dimming method. Thanks for your understanding.

    Best regards

    Suchen