Operating parameters estimation for universal mains
quasi-resonant converters including parasitic elements
Christophe Basso, ON Semiconductor rev 0.1
Thierry Sutto, ON Semiconductor rev 2
Pout16W Output power
Vout13V Output voltage
Iout 1.23A
Eff.0.70Efficiency
Vin127V Input voltage
Lp1,000μH Primary inductance
Cp47pF Resonating cap.
Lleak30μH Leakage inductance
Ns:Np0.2Turn ratio Ns:Np
Vf0.8V Sec. diode forward drop
Vreflected69.0V Reflected voltage over Lp
Vds peak1036.7V Peak drain voltage at switch opening
Vds slope22388.7V/μs Vds rising slope
Ip 1.05A Peak current
Ton8.29μs ON Time
Toff15.25μs Reset time
Tw0.68μs Valley delay
Tleak0.05μs Vds(t) rising time
Fsw41.2kHz Switching frequency
Vclamp525V VDSmax=Vin+Vclamp;
Vripple10V
Rclamp349726Ohm
Cclamp 3.642nF
Prclamp0.79W
300
310
320
330
340
350
360
370
Vin Ip Fsw Idrms Lp (mH)Fsw Ip 120 1.07239.70.3690.579.2 1.064 130 1.04441.80.3500.666.8 1.061 140 1.02143.80.3330.757.8 1.058 150 1.00045.70.3190.851.0 1.056 1600.98247.40.3060.945.6 1.054 1700.96748.90.295 1.041.2 1.052 1800.95350.40.284 1.137.6 1.051 1900.94151.80.275 1.234.6 1.050 2000.93053.00.267 1.332.0 1.049 2100.92054.20.259 1.429.8 1.048 2200.91155.30.252 1.527.9 1.047 2300.90356.30.245 1.626.2 1.046 2400.89657.30.239 1.724.7 1.045 2500.88958.20.234 1.823.4 1.045 2600.88359.10.228 1.922.2 1.044 2700.87759.90.223 2.021.1 1.043 2800.87260.70.219 2.120.1 1.043 2900.86761.40.214 2.219.2 1.042 3000.86362.10.210 2.318.4 1.042 3100.85862.70.207 2.417.7 1.042 3200.85563.30.203 2.517.0 1.041 3300.85163.90.199 2.616.3 1.041 3400.84864.40.196 2.715.7 1.041 3500.84465.00.193 2.815.2 1.040 3600.84165.50.190 2.914.7 1.040 3700.83766.10.187 3.014.2 1.039
LI2Ip RMS 0.0005670.354 0.0006750.354 0.0007840.355 0.0008920.355 0.0009990.355 0.0011070.355 0.0012150.355 0.0013220.355 0.0014290.355 0.0015360.355 0.0016430.355 0.001750.355 0.0018570.355 0.0019640.355 0.0020710.355 0.0021780.355 0.0022840.355 0.0023910.355 0.0024980.355 0.0026040.355 0.0027110.354 0.0028170.354 0.0029230.354 0.003030.354 0.0031360.354 0.0032390.354