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Calculation: LLC Full-Bridge Converter

Enter Operating Conditions
Vin [V_DC]: Np: Ns: Vout [V_DC]: Iout [A_DC]:
fsw [kHz]: fr [kHz]: N [No. of // FETs]:

Enter Gate Driver Parameters
Vgdrive [V]: Rg_Ext [Ω]: Rpu [Ω]: Rpd [Ω]: Tdead [s]:

Enter Diode Parameters
VF_D1 [V]: Qrr_D1 [C]: VF_D2 [V]: Qrr_D2 [C]:

Other Circuit Parameters
Lr [H]: DCRr [Ω]: Kh_Lr [Constant]: B_Lr [Tesla]: x_Lr [Exponent]:
Cin [F]: ESRin [Ω]: Cout [F]: ESRout [Ω]:

Enter Transformer Parameters
Lm [H]: DCRp [Ω]: DCRs [Ω]: Kh [Constant]: B_TF [Tesla]:
x [Exponent]: A_core_TF [m²]: L_core_TF [m]: Ke [Constant]: t_core_TF [m]:

Enter Thermal Parameters
TA [°C]: RthCA_Q1 [°C/W]: RthCA_Q2 [°C/W]: RthCA_Q3 [°C/W]: RthCA_Q4 [°C/W]:
TempCoeff [Rdson-TC Default]:

Calculated Parameters
Tsw [s]: D: M [1+Lm/Lr]: Lp [H]: Ls [H]:
Cr [F]: dir [in %]: dVCout [in %]:


Select Your Power Devices
Use parametric data from datasheet tables        Add measurement data from datasheet graphs

Select Mosfet Part [Q1]

Material Qualification
RDSON [Ohm] - Mounting
VDS [V] Package Area [mm2] -



   OR   

Note: Configuration, VDS [V], RDSon [mOhm] (Typ/Max), Vth_Max [V], Vgp_Typ [V]

Select Mosfet Part [Q2]

Material Qualification
RDSON [Ohm] - Mounting
VDS [V] Package Area [mm2] -



   OR   

Note: Configuration, VDS [V], RDSon [mOhm] (Typ/Max), Vth_Max [V], Vgp_Typ [V]

Select Mosfet Part [Q3]

Material Qualification
RDSON [Ohm] - Mounting
VDS [V] Package Area [mm2] -



   OR   

Note: Configuration, VDS [V], RDSon [mOhm] (Typ/Max), Vth_Max [V], Vgp_Typ [V]

Select Mosfet Part [Q4]

Material Qualification
RDSON [Ohm] - Mounting
VDS [V] Package Area [mm2] -



   OR   

Note: Configuration, VDS [V], RDSon [mOhm] (Typ/Max), Vth_Max [V], Vgp_Typ [V]


Converter Steady State Waveforms (assuming ideal switches)


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  • STEP-1
  • STEP-2
  • STEP-3
  • STEP-4



Loading.. Ip, ILm, ILr Vs. Time
ILr_RMS = 1128.943 A


Loading.. VLr, Vin, Vout Vs. Time


Loading.. Iin, ICin Vs. Time
Iin_RMS = 1128.943 A
ICin_RMS = 15.253 A


Loading.. Vp, Vs Vs. Time


Loading.. Q1_Q2_Parameters Vs. Time
Q1_VDS_RMS = 34.445 V
Q1_IDS_RMS = 887.750 A


Loading.. Q3_Q4_Parameters Vs. Time
Q3_VDS_RMS = 33.565 V
Q3_IDS_RMS = 770.318 A


Loading.. VGS Vs. Time


Loading.. VDS Vs. Time
Q1_VDS_RMS = 34.445 V
Q3_VDS_RMS = 33.565 V


Loading.. IDS Vs. Time
Q1_IDS_RMS = 887.750 A
Q3_IDS_RMS = 770.318 A


Loading.. PowerLoss Vs. Time