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LED Drivers

chitturi chowdary
Prodigy 40 points
Other Parts Discussed in Thread: TPS92690, LM3478, LM3488, LM3481, TPS40210, TPS40210-Q1, LM5022, LM5022-Q1

Hi I am satya.I am new to the forum. I am working on a project led drivers

After going through different ICs i zeroed on TI webench tool and TI ics which broadly support my requirements

The requirement is for different led drivers are

1) 24V input and different power capabilities

2) output voltage requirements are 54v, 60v, 72v and 120v 

I am having difficulty in finalizing the ic's.

What i am looking

a)if possible to have single ic or at the most 2 ics for my requirements

b) low bom cost

c) commonality of the components should be maximized.

Can somebody help me to finalize the ICs , as i work through to finish.

I have market requirement of the order of thousands per annuam 

Thanks

Chowdary

  • 0
    TI__Mastermind 25500 points

    Hello Chowdary,

    The most simple to design with for such an application would be the TPS92690. For component commonality you would just design for your highest output voltage and power level and it should work well for the others.

    Regards,

    Clint

  • 0 in reply to Clinton Jensen
    Prodigy 40 points

    Hi clinton

    TPS92690 caters for 3 output voltages 54, 60 and 72v. I have to use another ic  for 120v output.

    Another constraint i have is bom cost as the market price is low for 54v and high for 120v.

    So i have to reconcile between low bom cost and try to to as much commonality among 4 products.

    I will be going through webench also  and get back to you for further clarifications.

    Thanks 

    Chitturi

  • 0 in reply to Clinton Jensen
    Prodigy 40 points
    Hi Clinton
    I have to maintain my market price for my product between 5.30 to 10 dollars for my 4 products with margin for me.
    TPS92690 does not cater for 120v output.
    Thanks
    Chitturi
  • 0 in reply to Clinton Jensen
    Prodigy 40 points
    The proposed IC may not be cost efficient for me.
    I have inputted the data into webench with the following results
    link for webench is :webench.ti.com/.../visualizer.jsp

    1) 54V AND 60V IC SELECTION
    input range 20-30v, output 54v, iout 0.76a
    suggested bom cost for the ic's are
    LM3478, LM3488 $3.45
    LM3481, LM3488-Q1 $3.74, $3.59

    input range 20-30v, output 60v, iout 0.68a
    suggested bom cost for the ic's are
    LM3478, LM3488 $3.85
    LM3481, LM3488-Q1 $3.83 $3.99

    Questions:
    a) I have to select one of the ic LM3478, LM3488 or LM3481
    Which one you recommend?

    b) Is there any other way i can further optimize the bom cost
    by changing any of the parameters ?
    What is the procedure?

    c) part number link is not opening , showing page not found

    d) How do i simulate the circuit to get the voltages at different points?

    2) 72V IC SELECTION
    input range 20-30v, output 72v, iout 0.75a
    suggested bom cost for the ic's are
    TPS40210, TPS40210-Q1 $5.42 $5.56

    Question:
    a) In the tool schematics are not shown for the above 2 ic's
    How do i get schematics?

    3)120V IC SELECTION
    input range 20-30v, output 120v, iout 0.68a
    suggested bom cost for the ic's are
    LM5022, LM5022-Q1 $10.13 $10.27

    Questions
    a) This bom cost is high?
    Is there any way i can further optimize the bom cost by adjusting the parameters?


    Your values input is required.
    Once i freeze the design i want to simulate the circuit and check the voltages etc..

    Thanks
    Chitturi
  • 0 in reply to chitturi chowdary
    TI__Mastermind 25500 points

    Hello Chitturi,

    The 690 can do 120V output. None of its pins will see that high voltage. But I understand about cost. I will see about getting this thread moved to the correct forum so that you can get support on the devices you have listed. Today is a TI holiday so it might be delayed until Monday.

    Regards,

    Clint