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


    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…

  • [LT3743] How to remove surge current.

    I control IR-LED with LT3743.

    For 100us, it supplies 16V / 20A.

    I want to remove the waveform of the yellow dotted circle.

    The surge current is Max 33A in the yellow dotted circle.

    The power waveform is the same as this.

    High Side/Low Side MOSFET is BSC070N10LS5…

  • LT3743 used for multiple Lasers

    I have used the LT3743 in the past where we drove lasers with large currents ( 10-15A).  For this new project, i have 3 lasers with much smaller currents.  This part might not be the ideal part and I am open to another suggestion, but I'm somewhat familiar…

  • Problems with output current using LT3743


    I'm developing a LED driver running at high currents using the LT3743. I have build the circuit following the reference circuit given in page 23 of the datasheet.  I have changed the components on the board, according to the given calculations…

  • Voltage Value at RT on LT3743


    I am writing a test requirement document on a CCA the contains a LT3743.  I have reached the part of my test that would require probing at pin 15 (RT) on the LT3743.  I don't see any way to know what signal to expect there.  I see a max of 3V from…

  • LT3743 - Current shoot through in LTSpice sim?

    Hi all, 

    I would appreciate a bit of friendly advice. Can you please point me in the right direction? 

    I am trying to push the LT3743 to a ~40A solution. I am using it to drive a laser at dc. No PWM. Just 12V to about 40A (Vf is about 1.25V at this current…

  • LT3743 Step-Down LED Driver OVP

    I have received a couple of questions about OVP on the LT3743, so I am posting the latest question below to which I will post a reply:

    Could you provide a detailed description of the feedback mechanism please? I am unsure of whether the voltage is regulated…

  • LT3743 current leakage from IC to load (probably form SW)

     we are using LT3743 current regulator to drive a laser diode. The circuit is very similar to the example given on page 21 of its datasheet (www.analog.com/.../3743fe.pdf).
    We measure a current of nearly 40-50uA from the IC to the circuit output …

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


    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…