Design multi-stage power converters as one system.
Real parts from any manufacturer, solved across every stage, before you open a simulator.
DATASHEET · 100 V N-CHANNEL MOSFET
EXTRACTED PARAMETERS AND CURVES · TYP / MAX
Output characteristics●
R(DS)on vs gate drive●
Gate charge●
GATE CHARGE
Power derating●
GATE CHARGE
Power derating●
Transfer characteristics●
STATIC
Threshold vs temperature●
ABSOLUTE MAXIMUM
Body diode●
SWITCHING AND BODY DIODE
STATIC
ABSOLUTE MAXIMUM
R(DS)on vs drain current●
R(DS)on vs temperature●
Capacitance●
CAPACITANCE
Current derating●
Safe operating area●
RESULTS · 48 V → 12 V bus → 5 V @ 4.5 A / 3.3 V @ 4.5 A three-stage system
IN THE APP · EVERY CURSOR DRAGS
What a switching frequency costs
The whole system solved from 1 % to 100 % of load, at three of them. The design runs 300 kHz for 80.8 %; dropping to 200 kHz buys 4.9 points back, and pays for them in inductor size.
Every watt has an address
The system's 8.85 W split by stage and by mechanism: conduction, switching, gate charge, Coss, dead time, core and winding. Not a total to accept, a list to argue with.
top 3 rows = 57% of 8.85 W total
Heat changes the answer
Losses set temperature, temperature changes losses, and the two are solved together until they settle, here to a 47 °C rise. The curve is the solver converging, against the part's own 175 °C limit.
The loop, and its margin
Compensator, modulator and plant assembled into one loop gain, with crossover and 45° of phase margin read off it. The parts in the slots are what set it.
Parts fail in the corners
Every stress on the switch, at every input voltage and every load. High line at full load asks something different of a part than nominal does, and a grid is the only shape that shows a corner.
The part you did not pick
Loss against package footprint for every switch in the catalogue, at this operating point. The smallest package here holds the lowest-loss part. A parametric search sorts on Rds(on) and walks past it.
The material moves the whole curve
Steinmetz coefficients per material, so the inductor's core loss follows the flux and frequency it actually sees. Change the switching frequency and this moves with it.
Stage against stageROADMAP
The Middlebrook criterion on the interface between converters: a source impedance that meets a load impedance the wrong way makes two stable stages one unstable system.
The build, not the sampleROADMAP
Worst-case analysis over component tolerances, so the answer covers every unit you ship, including the ones that land at the corners of the tolerance stack.
Build the system.
Stages, buses and the interfaces between them, laid out as one connected chain. The interactions between them are part of the model.
Then look inside.
Drill into a stage and every component takes a real part. Every part is sized automatically, adjusting to your decisions.
Read the part itself.
Scrutinise the real datasheet parameters and curves for every component, not just generic models.
Then the answer.
Efficiency, losses, thermals, margin and more, solved at every operating point for every part.
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