• [LT3757] Can I generate 200V using output boost converter?

    Hi, sir/madame:

    I would like to generate 200V 10mA four MEMS application. Do I have to use the Flayback converter mode shown on page 32 of the datasheet to generate 200V from 12V? Can I simply use the following LTPowerCAD spreadsheet of boost converter…

  • LT3757


    I am using LT3757 High Voltage Flyback Power Supply
    in one of my designs, TDK DCT15EFD-U44S003
    transformer recommended is obselete, is there any alternate recommended.

    I need to generate  voltage upto -100/ -200V.

    Look forward for an immediate response…

  • LT3757

    I would like to do a small signal ac analysis of the LT3757 to get the gain phase both open loop and closed loop.  Is there a small signal averaged model for a SEPIC under current control that I can use that will run on LTspice?

  • LT3757 Discontinuous Operating Conditions


    I am interested in using the LT3757 to build a boost converter (that'll be powered by batteries later) in discontinuous mode. However it seems that most of the data sheet related to the LT3757 is about continuous functionality. If someone could specify…

  • LT3757 Flyback Converter

    I am trying to use the LT3757 as a flyback converter. I am generating 200V from 5V (<10mA). I am having issues with the transformer I selected. Since the transformer in the reference design (DCT15EFD-U44S003) is obsolete I went with the ATB322524-0110…

  • LT3757 coupled inductor selection

    Dear Sir/Madam,

    I am looking at the LT3757 to produce -33V@160mA from a 12V input.
    The solution size and lowest output ripple are the most important factors.
    I have been through the DS and calculated all the relevant values.
    IL1(PEAK) = 0.48A, IL2(PEAK…

  • LT3757 48VDC to 90VDC fails

    Hi all,

    I try to use the LT3757 to step up 48V to 88V in order to driver a 88V led string. I made a simulation in LTspice and it works fine. So i decided to make a prototype based on the circuit's datasheet and formulas as following:


    Vcc …

  • LT3757 flyback snubber question


      I'm currently using the LT3757 as a flyback controller and specification sheet outlines (page 20, snubber section) this for calculating Ccn:

    However, Rcn is not mentioned anywhere in this section.  Is Rcn a typo and should be Rsn as mentioned…

  • LT3757 Sepic convertor transient simulation


    I'm trying to design LT3757 sepic converter. However, while the output is not good while simulating load transients. 

    I  have attached .asc here. Could you please help improve it?

    Thanks in advance. 

     LT3757 sepic.zip

  • LT3757 High Voltage flyback MOSFET choice

    On page 30 of the LT3757 boost/flyback/sepic/inverting controller; there's an application for a 300V flyback design.

    The switching MOSFET selected for this design is a VISHAY SILICONIX Si7850DP which has a max drain-source voltage of 60V.

    When simulating…