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LP8860-Q1: LP8860-Q1 manufacturing delay reported ?

Chris van der Aar
Intellectual 570 points
Part Number: LP8860-Q1

I am working on a new design for a customer where we want to control 4 LED strips up to +24V@50mA controlled via SPI interface. We want to have dimming possibilities for this application. We don't use a microcontroller on this board so we have no PWM signal that we can use for this (most dimmable LED drivers need external PWM).I found the LP8860-Q1 that would be suitable for this application because of the internal programmable dimming feature. However Mouser reports 'manufacturer delays reported' for this device (they have some on stock at this moment). Could you please inform the status of this device? We need around 100 parts from next year when the series will start and a few the next months for our first prototypes. So we want to be sure that we don't get production problems when using this device now. Or do you have a similar device with SPI control and possibility for internal dimming or programmable current setting (4 channels up to +24V/50mA). The LP8860-Q1 looks a little bit complicated for our application but it is the only device I could find with internal programmable dimming functionality. 

Regards


Chris van der Aar

NTS Systems Development

Eindhoven The Netherlands

  • 0
    TI__Intellectual 1235 points
    Hello Chris van der Aar,

    Thank you for your interest in LP8860-Q1 and reaching out. LP8860-Q1 should be active and I am not aware of any particular stock issues. However since I don’t have specific details, I kindly suggest contacting our local sales team to confirm and coordinate. They also should be able to provide information of our marketing team who should be able to coordinate with you and help you to meet your schedule needs.

    Kind Regards,

    David D Quintana
  • 0 in reply to David Diaz Quintana1
    Intellectual 570 points

    Hi David, 

    Your answer is clear and I contacted our supplier for this. Still a technical question concerning the LP8860-Q1

    When we are implementing the LP8860-Q1 do we always need the boost circuit? In fact we already have a +24V supply for our LED strips and our LED strips have integrated series resistors so in fact we can connect them directly between +24V and the driver output.  In your application diagrams I don't see an example without the booster circuit.

    And is the device only suitable for LEDs in series without resistors? The LED strips we use have 4x39 Ohm series resistors (and 6 LEDs in series).

    Regards


    Chris van der Aar

    NTS Systems Development

    Eindhoven, The Netherlands

  • 0 in reply to Chris van der Aar
    TI__Intellectual 1235 points
    Hello Chris van der Aar,

    Sorry for the late reply on this. Are you saying that you would use LP8860 only as a current sink basically? If that is the case I’m wondering whether using LP8860 may be overkilling. Also as you probably have realized one big drawback I would see with your concept is that with a fixed voltage (as a VBOOST replacement) you won’t have the boost adapt capability that is so useful to cover for example the wide range of LED Vf (as a function of the temperature for example).

    You could use some load (resistance) in series with the LEDs (the current sink would see total load).

    Kind Regards,

    David