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The following is a design tool which calculates the parameters for a buck converter, boost converter or Buck-Boost Converter - (Step-down/Step-up or inverting). The calculator assumes that during the normal load the inductor is in continuous mode, meaning that the inductor never fully discharges it's current.  The design equations for which this calculator is based can be found at: 

Input your design requirements and the calculator will recommend the component values:

Input voltage: (V)
Output voltage: (V)
Diode Voltage Drop (V) 
Transistor Voltage Drop (V)
Frequency: (KHz)
Output Current: (A) 
Minimum Output Current: (A) Calculate Inductance based on this specification.
Inductor Current Ripple (%) Calculate Inductance based on this specification.
Output Voltage Ripple (%)



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