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Solutions DC Regulator Solutions DC-DC Voltage Regulation Step Down DC-DC Solutions (Vin > Vout)
Solutions Power Management Switching Regulator Step-Down (Buck) Regulators Internal Power Switch Buck
Solutions Power Management Switching Regulator Step-Down (Buck) Regulators High Input Voltage Buck

DC1221B - LT3502EDC Demo Board | 1.1MHz,500mA Step-Down Regulator

Demo circuit DC1221B is a monolithic step-down DC/DC switching regulator featuring the LT3502. The demo circuit is designed for 3.3V output from a 4.5V to 40V input. The wide input range of the LT3502 allows a variety of input sources including automotive batteries and 24V industrial supplies. The high switching frequency allows the use of tiny, low cost external components. The current mode control scheme creates fast transient response and good loop stability. The boost diode is internal to reduce component count. The SHDN pin can also be used to program soft start. In this mode, the SHDN pin is driven through an external RC filter to create a voltage ramp on this pin. The soft start function reduces the input current surge during start-up. Cycle by cycle current limit and frequency foldback provide the protection against shorted outputs. DA pin can further protect the silicon under fault conditions by sensing the diode current.

DC1221B - Schematic

 


Software

LTspice

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.

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