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LM3488 Step Up Converter

Enes A.
Prodigy 10 points

Other Parts Discussed in Thread: LM3488, LM3478

Hello,

My purpose is to reach 100 V with an Input Voltage of 12V.  Output current should be 0.1 A. Thats why i will use the Step Up Converter LM3488. But there are no calculation formulas for Compensation Resistor and Compensation Capacitors in Datasheet of LM3488. How can I calculate these Values? The other problem ist, how i can calculate the Input/Output Capacitors? In Datasheet is given for Inputcapacitor the RMS Current but how can help me this current when i want to know the capacitor values for Input and Output?

Its really difficult to understand all Datasheet. I used Webench but can i trust those values which Webench gives me?

Can anyone help me for my design?

Best Regards

Enes

  • 0
    TI__Mastermind 26036 points

    I'd use a boost controller like TPS40210.

    This part is well supported by design and simulation tools, application notes, EVMs and reference designs...

    have a look at the link  http://www.ti.com/product/tps40210

    Vincenzo

  • 0
    TI__Genius 15810 points

    Hello Enes,

    It is true that the D/S does not contain information on how to calculate the compensation. Here is a white paper that has been written on Current Mode Control which will help you understand the fundamentals (http://www.ti.com/lit/an/snva555/snva555.pdf) and the eval app note written to calculate the compensation components for the LM3478/88 (http://www.ti.com/lit/an/snva067b/snva067b.pdf). Webench uses a similar methodology to calculate the compensation components. Also, the SPICE models on webench have been compared against actual bench data from a prototype eval board. I created a design for 12Vin to 100V out at 100mA load current. The bode plot sim model for that design shows a crossover frequency of about 1.5KHz and 80deg of phase margin for a switching frequency of 325KHz. The design seems to be quite stable.

    But as is the case with any tool, you should prototype your design on a board and make sure it works before putting it in to production. 

    I hope this information helps.

    Best Regards,

    Akshay Mehta