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LED Driver with DC Step up (Boost) Controller Design

Bhumit Trivedi
Prodigy 90 points
Other Parts Discussed in Thread: TPS61197, TPS61196

Dear Sir,

Greetings

Our team is working on the LED driver design with DC boost converter

Our Input and Output Specification are as follows,

Input: 12V DC from conventional battery

Output: 30V DC @ 1.4 Amps Constant

We have to drive our LED light. So for switching is MOSFET needed or simple Boost Converter will work to drive our LED light... Please Help with you expert knowledge.

Seeking your kind response ASAP.

Bhumit Trivedi

  • 0
    TI__Intellectual 1010 points

    Bhumit,

    Please take a look at the TPS61197. It can meet your requirement.

    thanks

    Gavin

     

  • 0 in reply to Gavin Jin
    Prodigy 90 points

    Dear Gavin Sir,

    I gone through the datasheet for the part suggested by you but it says, it can only support 1 string having multiple LEDs in series.

    The issue is one of light is having 2 stings each containing 9 LEDs in series. And second light is having 4 strings each containing 9 LEDs in series.

    So for this kind of load, Which IC would be most appropriate please share your expertise with us.

    I have gone through WEBENCH but didn't find any satisfactory solution for our application.

    Please guide further.

    Regards,

    Bhumit Trivedi

     

  • 0 in reply to Bhumit Trivedi
    TI__Intellectual 1010 points

    Bhumit,

    For multiple strings, the TPS61196 can support up to 6 strings. So you can tie three channels together to support 2 LED strings. For 4 LED strings with 350mA LED current per string (total 1.4A), you need to check the thermal based on the different forward LED voltage between strings. If the voltage difference between strings is very small, the TPS61196 is OK for its 400mA LED current capability per channel.

    thank

    Gavin

     

  • 0 in reply to Gavin Jin
    Prodigy 90 points

    Dear Gavin Sir,

    Thanks for your valuable guidance. It seems like TPS61196 is perfect for our application. The issue is it is not webench enabled for the reference design.Our team had gone through the LED tag for the regarding design development  but TPS61196 is not available with design for our application.

    Please guide further for the same.

    Regards,

    Bhumit

  • 0 in reply to Bhumit Trivedi
    TI__Prodigy 250 points

    Hi Bhumit,

    please see TPS61196 spreadsheet in attached, it is helpfull for your reference design.

    please let me know if you have any question.

  • 0 in reply to Hank Cao
    Prodigy 90 points

    Dear Hank Cao Sir,

    I have LED Specification as follows,

    LED Forward voltage: 3.3V DC

    LED Forward current: 0.350 A

    I have 9 LEDs in a single sting. I have 4 stings like wise.

    Input is from a 12VDC Conventional Liquid filled or dry cell battery.

    Output should be 32VDC @ 1.4 Amps.

    This is my complete design need. Please advice for such application.

    Regards,

    Bhumit Trivedi.

  • 0 in reply to Bhumit Trivedi
    TI__Prodigy 250 points

    Bhumit,

    For 4 LED strings with 350mA LED current per string (total 1.4A), you need to check the thermal based on the different forward LED voltage between strings. If the voltage difference between strings is very small, the TPS61196 is OK for its 400mA LED current capability per channel.