Flyback SMPS Calculator

Inputs

Primary Input Voltage (Vin)

Output Voltage (Vo1)

Transformer Primary Inductance

µH

VT Product

V·µs

Turns Ratio

Np:Ns

Diode Voltage Drop (Vd)

Transistor Voltage Drop (Vtran)

Outputs

Ton (max)

µs

Duty Cycle

Frequency (min)

kHz

Energy Per Cycle

µJ

Power (Max)

Input Current (max)

Output Current (max)

Equations

\[ \begin{aligned} VT &= I_{sat} L \\[8pt] DC &= \frac{V_{out}}{V_{in} N} \\[8pt] f_{min} &= \frac{DC}{T_{ON_{max}}} \\[8pt] E_{cycle} &= \frac{I_{sat}^2 L}{2} \\[8pt] P_{max} &= E_{cycle} f = \frac{I_{sat}^2 L f}{2} \\[8pt] I_{out1} &= \frac{P_{max}}{V_{out1}} \end{aligned} \] Where:

\[ \begin{array}{r l} VT & = \text{volt-time product} \\[4pt] DC & = \text{duty cycle} \\[4pt] f_{min} & = \text{minimum frequency} \\[4pt] E_{cycle}& = \text{energy per cycle} \\[4pt] P_{max} & = \text{maximum power} \\[4pt] I_{out} & = \text{output current} \\[4pt] L & = \text{transformer primary inductance} \\[4pt] I_{sat} & = \text{saturation current} \\[4pt] T_{ON_{max}} & = \text{wave high time} \\[4pt] V_{out} & = \text{output voltage} \end{array} \]

Flyback SMPS Calculator

Inputs

Outputs

Equations

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