1. Skip to navigation
  2. Skip to content
  3. Skip to sidebar

DC1268B-B - LT3755EUD-1 Demo Board | Boost LED Driver Controller, 8V ≤ VIN ≤ 40V, VLED up to 54V @ 1A

Demonstration circuit 1268B is a high voltage and high current LED driver controller featuring the multitopology, constant current, constant voltage LT3755-2 (1268B-A) or LT3755-1 (1268B-B). The LT3755-2 features an OPEN LED status pin, while the LT3755-1 allows external frequency synchronization. The demonstration circuit is assembled as a boost topology with an 8V to 40V input voltage range, 1A LED current and up to 54V LED forward voltage.

The DC 1268B features PWM dimming, analog dimming, shutdown, and open LED overvoltage protection. Open circuit LED protection clamps the LED voltage at 56V, though the ICs can provide an output voltage up to 75V.


DC1268B-A - Schematic




LTspice® software is a powerful, fast and free simulation tool, schematic capture and waveform viewer with enhancements and models for improving the simulation of switching regulators. Click here to download LTspice

To launch a ready to run LTspice demonstration circuit for this part:

  • Step 1: If you have not installed LTspice on this computer, download and install LTspice
  • Step 2: Once LTspice is installed, click on the link(s) below to launch the simulation
  • Step 3: If LTspice does not automatically open after clicking the link above, you can instead run the simulation by right clicking on the link and selecting "Save Target As." After saving the file to your computer, start LTspice and open the demonstration circuit by selecting 'Open' from the 'File' menu

To explore other ready to run LTspice demonstration circuits, please visit our Demo Circuits Collection.