PSU design, SMPS, diference between ic's

Discussion in 'Power Electronics' started by rggmiranda, Apr 7, 2017.

  1. rggmiranda

    Thread Starter New Member

    Jun 6, 2016
    Hello everyone,

    I want to build a psu like the following one
    Since I need to design this circuit for mass production I need to know the diference between the following two IC's to minimize cost:

    As I've seen in the datasheet both are offered in SMD package. For the cost perspective the tny286 is cheaper on large scales.

    Also, can someone explain me the following chart from the datasheet? Does it mean the amount of power that the supplier is guaranteeing the chip to provide under the specified conditions of temperature?

    Thanks in advance for your help.
  2. Ramussons

    Well-Known Member

    May 3, 2013
    It would better to use a bridge instead of a half wave rectifier to start with.
  3. Dodgydave

    AAC Fanatic!

    Jun 22, 2012
    The top one is a Dip 8 package for 12W @5.8V output.

    The second is a Smd package for 15W @5.0V output.

    The "Open Frame Package" is for a large pcb like in an atx, it will have more ventilation, whereas "Adapter"is enclosed and will be at higher temperature and so gives less power, Test conditions are @50C.
    Last edited: Apr 8, 2017
  4. rggmiranda

    Thread Starter New Member

    Jun 6, 2016
    Yes, that is something that I was considering so I can reduce the capacity of the filtering capacitor and lower the cost.

    Ok excelent, I will go for the smd one then

    Thanks you