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300W LED driver

Siyavash Asadi
Intellectual 665 points
Other Parts Discussed in Thread: TPS92515, TPS92513, LM3414

Hello,

I am new in this field. we have 100, 3W LEDs. I have to design driver for it. I tried to put every 10 LEDs in one string so I have 10 string that each string has 10 LED with 700mA current and 3.4V Vf.

also I have an AL-PCB that has 10x10 LED with same configuration but positive and negative side of all strings are connected together.

my question are:

1. Is there any way to use this AL-PCB with TI led drivers?

2. Is it better to design customized PCB for LEDs with separate strings?

any help would be greatly appreciated.

Siyavash.

  • 0
    TI__Mastermind 25500 points

    Hello Siyavash,

    What kind of application is this for? 300W with a single driver may be difficult to do. But to know for sure I would need more information. What is the input voltage you will be using? Do you need analog or PWM dimming or just constant current?

    Thanks,

    Clint

  • 0 in reply to Clinton Jensen
    Intellectual 665 points

    Hello Clint,

    thanks for reply.

    I want to build exposure box. input voltage is not important and we can select it for any voltage but I think for this application standard 48V switching power supply is good.

    I need to set constant current for each test. and test takes at least some minutes.

    My investigations show using one driver for all string is very unsafe because failure of one string will increase the current in the other strings. so I think it is better to driver each string individually.

    best regards,

    Siyavash.

  • 0 in reply to Siyavash Asadi
    TI__Mastermind 25500 points

    Hello Siyavash,

    If you would like to drive each string separately at 700mA with a 48V input the most simple solutions would be to drive each string with either an LM3414, a TPS92513, or a TPS92515 depending on what type, if any, dimming requirements you have. Feel free to let me know if you have any questions about any of those devices. It is always best to use a buck regulator if possible since they are the easiest to use and usually have the best dimming performance and if you have a 48V input available this would be the way to go.

    Thanks,

    Clint