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TPS92633-Q1: Similar IC with high current and more channels

Tex
Intellectual 320 points
Part Number: TPS92633-Q1
Other Parts Discussed in Thread: TLC69627-Q1

Tool/software:

Dear TI,

I have been using TPS92633-Q1 for while, but now i needed a similar IC but with atleast 300mA and minimum of 9 channels.. Even if it supports less number of channels it should atleast support SPI or I2C and should be able to control Brightness of individual channel..

I have been searching for a while.. I would wonder if such IC exist !!!

Kind regards,

Tex

  • 0
    TI__Genius 11645 points

    Hi Tex,

    Do you mean 300mA per channel x9 channels for a total of 2.7 amps? There is no linear driver that can dissipate this much power. You may need to consider a more complex architecture perhaps with a combination of switching regulators and linear drivers.

    Can you provide more information on your application? Please provide the following:

    1. Input supply voltage
    2. output current per channel
    3. total number of channels
    4. # of LEDs in string (per channel)
    5. total forward voltage of each LED string
    6. End equipment (automotive, medical, display, etc) 

    Thanks,

    Zach

  • 0 in reply to Zach Olson
    Intellectual 320 points

    Thanks for the reply Zach!

    Please find the below info that you need:

    Zach Olson said:
    Input supply voltage

    9V battery.

    Zach Olson said:
    output current per channel

    minimum 300mA

    Zach Olson said:
    total number of channels

    9 channels. (3 Channels of 3 ICs also fine with less circuitry..)

    Zach Olson said:
    # of LEDs in string (per channel)

    2 LEDs per string

    Zach Olson said:
    total forward voltage of each LED string

    6V per channel 

    Zach Olson said:
    End equipment (automotive, medical, display, etc) 

    Automotive

    Thanks,

    Tex

  • +1 in reply to Tex
    TI__Genius 11645 points

    Hi Tex,

    For a linear device with 9V supply, 6V output, and 2.7A total current, the internal power dissipation is 8.1W. Even spread across multiple devices this will generate a lot of heat. What is your plan to deal with this heat dissipation? Are you able to design an integral heatsink with adequate airflow?

    What are your design constraints?

    Do you prioritize cost, size, efficiency, noise, etc?

    Does the device have to be automotive qualified?

    My approach would be to step down the battery voltage with a switching buck voltage regulator to a linear device that will control the channel current.

    For the linear, you can consider TLC69627-Q1: https://www.ti.com/product/TLC69627-Q1 

    This is a 48-channel device with up to 60mA per channel. You can configure 5 channels in parallel to get your 300mA output. You will need a total of 45 channels (9 x 5 parallel channels) for your total solution. The TLC69627-Q1 has individual 7-bit dot correction as well as 16-bit PWM dimming to control the brightness through SPI. This seems to meet all of your requirements.

    I also recommend using the adaptive headroom voltage control (AHVC) feature that connects to your buck regulator's FB pin to optimize the internal power dissipation. If you are interested in using this solution I can also recommend a buck regulator to pair with the TLC69627-Q1.

    Regards,

    Zach

  • 0 in reply to Zach Olson
    Intellectual 320 points

    Hi Zach, Thanks for all the info.

    Zach Olson said:
    What is your plan to deal with this heat dissipation? Are you able to design an integral heatsink with adequate airflow?

    Yes, planning to give ventilation area in enclosure and also planning to give number of possible vias for heat dissipation in the PCB.. since the PCB is very small i really appreciate if you share any ideas for heat dissipation.

    I do prioritize size and efficiency and its going to be an initial prototype..

    I really appreciate it if you can also share any dual cell rechargeable power management IC with less circuit possible..

    Thanks,

    Tex

  • +1 in reply to Tex
    TI__Genius 11645 points

    Hi Tex,

    Feel free to post a new question to the battery management group here on E2E. If you provide your design requirements they will be able to help you with battery management IC.

    Regards,

    Zach