MOSFET Loss Calculator - Calc Engines

MOSFET Power Loss Calculator

Converter Configuration Select Topology + Mode: Waveform Type:

Operating Conditions Drain-Source Voltage (Vds): Peak Load Current (Iload): Duty Cycle (0-1): Rds(on):

Switching Parameters Switching Frequency (kHz): Rise Time (ns): Fall Time (ns): Dead-Time (ns): Body Diode Forward Voltage (Vf): Reverse Recovery Charge (Qrr in nC):

Gate Drive Loss Gate Charge (Qg in nC): Gate Drive Voltage (Vgs):

Output Capacitance Output Capacitance (Coss in pF):

Thermal Parameters Ambient Temp (°C): Thermal Resistance RθJA (°C/W):

This advanced calculator estimates the total power loss and junction temperature of a MOSFET under different operating conditions. It allows engineers and power electronics designers to input a wide range of real-world parameters and analyze how much power is dissipated in the form of:

✅ Conduction Loss (I² × RDS(on))
✅ Switching Losses (based on turn-on/off times)
✅ Gate Drive Losses (Qg × Vgs × fsw)
✅ Output Capacitance Loss (Coss related losses)
✅ Body Diode Loss and Reverse Recovery Loss (for asynchronous mode)
✅ Dead-time loss consideration
✅ Junction Temperature estimate based on ambient temp and thermal resistance

⚙️ Features:

✅ Combined Configuration Selection

Choose from:

Buck (Async / Sync)
Boost (Async / Sync)
Full-Bridge (Sync)

This ensures the calculator uses correct loss models for your converter design.

✅ Waveform-Based RMS Current Estimation

Supports current waveforms like:

DC
Sinusoidal
Triangular
Trapezoidal

Automatically adjusts RMS current to reflect real-world load conditions.

✅ Thermal Modeling

The calculator estimates MOSFET junction temperature (Tj) based on:

Ambient temperature
Total power loss
Specified thermal resistance (RθJA)

✅ Designed for:

Power Supply Designers (Buck, Boost, Full-Bridge)
BLDC / PMSM Drive Engineers
High-Frequency Switching Circuit Designers
RF Switch and Telecom Hardware Engineers