• RE: LT3743 used for multiple Lasers

    Thanks for the post.  In general, controllers like the LT3743 can handle a wide range of current levels compared to monolithic ICs.  That's because the signal levels in controllers are based on the external sense resistor instead of an internal fixed sense…

  • RE: Constant current generator

    Read this post and this post for some background on how these types of current sources are used to drive LEDs in general.  The posts are called "LT3743 used for multiple Lasers" and "LT3476EUHF" respectively.

  • RE: LT3743 Step-Down LED Drive OVP

    Basically the LT3743 has two regulation loops:  a voltage regulation loop with FB as an input and a current regulation loop with SENSE+/SENSE- as the input.  When the LT3743 is driving an LED, the current regulation loop should be in control and the output…

  • LT3743 DESIGN

    The LED driver LT3743 drives two levels of current 16Amp and 4Amp.

    The LED driver drives these currents separately meaning: I use 16amp  or 4am. in separate times and the gape between the two currents is seconds.

    Also I am not sensitive to the fading of…

  • LT3743 efficiency skip

    Hello.

    The product page promotional video showed a chart of duty and efficiency. There is a point where the efficiency changes non-linearly at low duty in the graph there. I want to know what is happening at this change point.

    When controlling the output…

  • RE: Problems with output current using LT3743

    Go through Technical Support and tell them you want them to forward your schematic and layer pdfs to the factory applications engineer for the LT3743.  Technical Support will get the files to me.

  • LT3743 shuts down when I switch from a low current to a high, while increasing slowly works

    Hello,

    I am developing a 400W buck driver for a big flashlight company.

    I use the LT3743 buck chip with 4 LEDs in series at 30A shown as TYPICAL APPLICATIONS 24V, 20A 3-LED Driver on page 24 of the datasheet, MOSFETS are doubled to manage this current…

  • ARAD Supported Parts as of 2020 January 8_0

    LT1074
    LT1076
    LT1076-5
    LT1082
    LT1083
    LT1083-Fixed
    LT1084
    LT1084-Fixed
    LT1085
    LT1085-Fixed
    LT1086
    LT1087
    LT1173
    LT1268
    LT1269
    LT1270
    LT1271
    LT1432
    LT1432-3.3
    LT1500
    LT1501
    LT1572
    LT1932
    LT1937
    LT3003
    LT3015
    LT3030
    LT3061
    LT3062
    LT3063
    LT3080
    LT3080-1
    LT3081
    LT3082
    LT3083
    LT3085
    LT3086
    LT…

  • LT3741 Current Regulation Accuracy

    A customer asks a question about the LT3741: “how (do) you calculate the accuracy or tolerance of the current it is controlling”?

     

    ANSWER:

    Let’s limit the discussion to the VCTRL = 1.5V case because you will have the best current regulation…

  • LT3741 Slope Compensation

    A customer asks, "concerning the LT3741, are there advices if the duty cycle is bigger than 50%, for example, minimum value of the inductor ?"

    I will answer myself in a REPLY post.