Gate signal for the Mosfet:Your browser does not support the HTML5 canvas tag.

Current through the inductor 1:Your browser does not support the HTML5 canvas tag.

Voltage across the Inductor 1Your browser does not support the HTML5 canvas tag.

Current through the inductor 2:Your browser does not support the HTML5 canvas tag.

Voltage across the Inductor 2Your browser does not support the HTML5 canvas tag.

Current through the Mosfet:Your browser does not support the HTML5 canvas tag.

Voltage across the MosfetYour browser does not support the HTML5 canvas tag.

Current through the diode:Your browser does not support the HTML5 canvas tag.

Voltage across the DiodeYour browser does not support the HTML5 canvas tag.

Control to output

Input to output

The selected control method is: No control

Losses

Magnetics

Help

Inputs

The minumum parameters required for designing a SMPS are the input and output voltage, current and switching frequency.

You either specify the value of the inductance in μH, or you can specify the current ripple as a percentage.

If you want to have a maximum peak-peak value of the current of 400mA for an averaged output current of 1[A], you select 40% and leave the input value for the inductor equal to 0. A corresponding value for the inductance is then calculated.

If you specify the numerical value for the inductance, the waveform of the current is calculated.

To find the inductance at the border of CCM and DCM, specify a value of 200% for the current ripple.

Numerical evaluation of inputs

An input value has to be provided, but can be replaced by an expression, for example 0.5*12 for an output voltage or 20/3.3 for an output current.

Using parameters as input variable

You can use the input variables as a parameter in an expression, to make the input dependent. For example the first input would be V_in being equal to 5 volts. The output voltage could then be written as 2*Vin for an output voltage of 10 volts. In this way you can scale parameters.

Calculation

Simply press the [Enter] key on your keyboard or select the [Calculate] button below the numerical input form.

Graphical and Numerical results

The short form of the numerical results is always presented at the top of the Graphical results. Opening the tab [Numerical Results] will give a more detailed overview and explanation of the numerical results.