Sam Gorman

Estimate preliminary PCB copper trace width from current, temperature rise, copper thickness, and layer position.

Estimate air-core coil inductance in uH from turns and dimensions for single-layer, multilayer, and flat spiral coils.

Calculate inductor energy from inductance and current, or solve for inductance or current with an optional RL discharge check.

Size a boost converter with duty cycle, inductor, capacitor, current stress, and practical loss adjustments.

Size an ideal buck converter and check duty cycle, inductor ripple, peak current, capacitor needs, and CCM warning notes.

Estimate MOSFET heat from RDS(on), PWM switching, Coss, gate charge, and thermal resistance.

Calculate a MOSFET gate resistor from Qg, drive voltage, target switching time, frequency, and driver peak current.

Find an NPN common-emitter DC Q-point, region, node voltages, currents, and beta range sensitivity.

Find a safe BJT base resistor, nearest E-series value, base current, pin current margin, and resistor power check.

Find the series resistor for a Zener shunt regulator and check Zener current plus resistor and diode power.