Flyback isolated Controller

Hi Everyone.

I am writing in order to ask you a question regarding my work. I am currently working on a project in which I try to find the proper flyback regulator or flyback PWM controller. I would acknowledge if you could suggest me any probable IC with following criteria:

Vin= 12-36V
Iout =100-120mA
Opto/isolated
Vout= 24V or +/- 12V
Price = 1-1.5$

I have seen and simulated on LTSpice the LT8304 which is rather expensive, but I prefer a cheeper alternative max. 1.5$.


Many thanks and looking forward to hearing from you,

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  • +1
    •  Analog Employees 
    on Mar 15, 2020 5:30 PM

    Hi:

    The better option would be LT8301. If your application is not automotive, then the LT3001 is lower cost. Please contact your local ADI sales office for quote.

    Thank you!

  • I have designed this flyback converter with an LT3001 (or LT8301) IC. It should be able to deliver a constant output voltage of 24V and current up to 120mA at an input voltage of (V_in=8-32V). I took a circuit from the IC datasheet and used exactly the components suggested by the IC manufacturer for 24 Volt Output voltage and built my board.
    However, I do not measure the desired voltage on the secondary side. So when turning up the input voltage the output voltage stagnates at about 12 Volts and drops down again to about 3 Volts. I have tested with 3 boards and I got the same result. I will send you the component list

    XLSX.


    So I want to ask you if you can help me figure out what the problem is?

    Best regards,

    Masoud

Reply
  • I have designed this flyback converter with an LT3001 (or LT8301) IC. It should be able to deliver a constant output voltage of 24V and current up to 120mA at an input voltage of (V_in=8-32V). I took a circuit from the IC datasheet and used exactly the components suggested by the IC manufacturer for 24 Volt Output voltage and built my board.
    However, I do not measure the desired voltage on the secondary side. So when turning up the input voltage the output voltage stagnates at about 12 Volts and drops down again to about 3 Volts. I have tested with 3 boards and I got the same result. I will send you the component list

    XLSX.


    So I want to ask you if you can help me figure out what the problem is?

    Best regards,

    Masoud

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