Design efficient flyback converters with our free online calculator. Accurately determine primary inductance (Lp), transformer turns ratio (N), peak primary current (Ipk_primary), and essential power values for your switched-mode power supply (SMPS) projects. Optimize your power electronics designs effortlessly for various applications.
Formula:
To calculate the key parameters for your Flyback Converter, we use the following formulas:
- 1. Output Power (Pout):
Pout = Vout × Iout - 2. Input Power (Pin):
Pin = Pout / (Efficiency / 100) - 3. Transformer Turns Ratio (N):
N = (Vin_min × (1 - Dmax)) / (Dmax × (Vout + Vf)) - 4. Peak Primary Current (Ipk_primary):
Ipk_primary = (Pin × 2) / (Vin_min × Dmax) - 5. Primary Inductance (Lp):
Lp = (Vin_min × Dmax) / (Ipk_primary × Fs)
Where:
- Vin_min: Minimum Input Voltage (Volts)
- Vout: Output Voltage (Volts)
- Iout: Output Current (Amperes)
- Dmax: Maximum Duty Cycle (ratio, e.g., 0.5 for 50%)
- Fs: Switching Frequency (Hertz)
- Efficiency: Converter Efficiency (Percentage, e.g., 85)
- Vf: Output Diode Forward Voltage (Volts)
- Pout: Output Power (Watts)
- Pin: Input Power (Watts)
- N: Transformer Turns Ratio (Nprimary / Nsecondary)
- Ipk_primary: Peak Primary Current (Amperes)
- Lp: Primary Inductance (Henries)