Benchmark scorecard

Compare PWMSim and LTspice using the same downloadable netlists, clear measurement steps, and stated tolerances.

Evidence has tiers. A promoted test passes an independent physics check and can be reproduced from its sources. The matched-derived and deferred cases stay visibly separate. Read how validation works before using the results.

Complete gallery-example LTspice coverage

This table includes every public example. For numerical rows, the browser circuit is exported and the exported file is run in LTspice. Other rows name the first PWMSim-only component that prevents an accurate export.

18/18 gallery examples are classified. 8/8 exportable examples pass their stated checks. The other 10 use models that cannot be exported accurately. Those rows are limits, not failed simulations, and do not count as matches.

gallery example	LTspice status	named measure PWMSim / LTspice	delta	declared gates
Buck Converter — CCM download LTspice measurement deck	NUMERICAL PASS	output mean 0.881479 V / 0.896857 V	1.715%	5/5 PASS
Measurement recipe: last 10 switching periods on a shared 4001-point grid. Boundary: Simplified fixed-gate power stage with analytic and LTspice evidence; not validation of closed-loop control, package parasitics, or hardware performance.
Buck — CCM/DCM Load Boundary download LTspice measurement deck	NUMERICAL PASS	output mean 0.881479 V / 0.896857 V	1.715%	5/5 PASS
Measurement recipe: last 10 switching periods on a shared 4001-point grid. Boundary: The default 1 Ω point has catalog-level LTspice parity; the swept CCM/DCM transition points are not independently compared or promoted.
Buck — Startup vs Periodic Steady State download LTspice measurement deck	NUMERICAL PASS	output mean 0.881483 V / 0.890425 V	1.004%	5/5 PASS
Measurement recipe: last 10 switching periods on a shared 4001-point grid. Boundary: The final transient operating point has catalog-level LTspice parity; startup waveform shape and the direct periodic-orbit method are not pointwise comparison claims.
PI Buck — 5 V Regulation	NO FAITHFUL EXPORT	S1: sampled PI control has no faithful portable SPICE-card export
Boundary: Application example of the native sampled PI law; not an externally validated hardware design.
PI Buck — Line and Load Steps	NO FAITHFUL EXPORT	S1: sampled PI control has no faithful portable SPICE-card export
Boundary: Application stress example reproduced from the native/Python controller cross-check; not hardware validation.
Hysteretic Buck — Comparator Control	NO FAITHFUL EXPORT	A1: comparator is a native-only component and has no faithful portable SPICE-card export
Boundary: Demonstration of the native comparator and voltage-controlled switch models; not a reproduced corpus case or a validated design.
Duty-Commanded Buck — Control-to-Output	NO FAITHFUL EXPORT	S1: duty-commanded PWM modulation has no faithful portable SPICE-card export
Boundary: Demonstration of the duty-modulated switch and the control-to-output sweep; not a reproduced corpus case or a validated design.
Peak Current-Mode Buck	NO FAITHFUL EXPORT	S1: peak current-mode PWM has no faithful portable SPICE-card export
Boundary: Demonstration of the native peak-current-mode switch; not a reproduced corpus case or a validated design.
Peak Current-Mode Buck — Command and Load	NO FAITHFUL EXPORT	S1: peak current-mode PWM has no faithful portable SPICE-card export
Boundary: Native peak-current-mode behavior example; no vendor controller, hardware loop, or LTspice comparison is claimed.
Boost Converter — CCM download LTspice measurement deck	NUMERICAL PASS	output mean 3.2813 V / 3.28392 V	0.080%	5/5 PASS
Measurement recipe: last 10 switching periods on a shared 4001-point grid. Boundary: Simplified fixed-gate power stage with analytic and LTspice evidence; not validation of closed-loop control, package parasitics, or hardware performance.
Boost — Duty and Load Sweeps download LTspice measurement deck	NUMERICAL PASS	output mean 3.2813 V / 3.28392 V	0.080%	5/5 PASS
Measurement recipe: last 10 switching periods on a shared 4001-point grid. Boundary: The default boost point has catalog-level LTspice parity; the suggested duty and load sweep points are not independently compared or promoted.
Flyback Converter — CCM download LTspice measurement deck	NUMERICAL PASS	output mean 5.04873 V / 5.14409 V	1.854%	2/2 PASS
Measurement recipe: last 10 switching periods on a shared 4001-point grid. Current shape is diagnostic across ideal coupled-winding commutation. Boundary: Nominal 48 V fixed-command flyback-CCM power stage with unchanged-source shallow-CCM provenance, periodic PWMSim evidence, and matched LTspice output, mode, and volt-second gates. Not validation of source-controller behavior, load range, package parasitics, or hardware performance. Ripple and primary-current shape remain diagnostic.
Flyback — Turns Ratio and Load download LTspice measurement deck	NUMERICAL PASS	output mean 5.04873 V / 5.14409 V	1.854%	2/2 PASS
Measurement recipe: last 10 switching periods on a shared 4001-point grid. Current shape is diagnostic across ideal coupled-winding commutation. Boundary: The default flyback point has bounded catalog-level LTspice output parity; altered turns-ratio and load points are not independently compared or promoted.
Diode Reverse-Recovery Pulse download LTspice measurement deck	NUMERICAL PASS	reverse-current minimum -4.96928 A / -4.96967 A	0.008%	3/3 PASS
Measurement recipe: full-transient reverse-recovery landmarks. Boundary: Generic charge-control diode cell with LTspice parity for reverse-current minimum and timing; not a vendor model, datasheet fit, switching-loss, or hardware claim.
IGBT Clamped Inductive Switching	NO FAITHFUL EXPORT	Z1: igbt is a native-only component and has no faithful portable SPICE-card export
Boundary: Demonstration of the native IGBT device model in a clamped inductive cell; not a reproduced corpus case, a switching-loss claim, or a datasheet comparison.
Thyristor Latching Load Switch	NO FAITHFUL EXPORT	Y1: scr is a native-only component and has no faithful portable SPICE-card export
Boundary: Demonstration of the native SCR latching model; not a reproduced corpus case or a device-datasheet comparison.
Saturable Inductor — Saturation Knee	NO FAITHFUL EXPORT	L1: satind is a native-only component and has no faithful portable SPICE-card export
Boundary: Demonstration of the native saturable-inductor model; not a reproduced corpus case or a core-datasheet comparison.
DC Motor Start-Up	NO FAITHFUL EXPORT	A1: motor is a native-only component and has no faithful portable SPICE-card export
Boundary: Demonstration of the native DC machine model; not a reproduced corpus case or a motor-datasheet comparison.

Portable PWMSim / LTspice benchmarks

You can download and run every netlist in this section. PWMSim and LTspice use the same file and the listed measurement steps. The page does not use averaged or hand-picked results.

The page shows two types of checks. Formula check compares PWMSim with a formula or expected range. LTspice comparison compares the PWMSim and LTspice values for one row. A passing row only covers the measurements it lists.

No runtimes are published here. The test records do not include the computer used. A speed comparison without hardware details would be misleading, so this page focuses on correctness.

Each case is defined by the portable netlist in bench/cases/. Analytic result grades PWMSim against an equation or bounded expectation where one exists. LTspice parity is a separate, per-measure PWMSim/LTspice gate; it never means that unlisted converter behavior was tested. buck_rr_loss runs on PWMSim as the compiled co-simulation equivalent of its netlist.

LTspice columns were measured with LTspice 26.0.2. The recovery case uses matched Vp=0.65 modified charge control and a 5 ns LTspice maximum timestep. Converter operating-point rows use a 4001-point shared grid over the last 20 switching periods, with 2% mean/RMS, 5% extrema, and 10% peak-to-peak relative gates plus the declared absolute fallbacks.

LTspice results. 38/38 same-file comparisons pass. This includes 30/30 operating-point measurements for buck CCM, buck DCM, and boost CCM. Each case lists what was measured and what was not tested.

rlc_step

download netlist — measured by the PWMSim switched-linear evidence harness

Measured boundary: step-response landmarks · LTspice parity: 3/3 measures pass
Not tested: frequency-domain response and parameter sweeps

metric	analytic reference	expected	PWMSim	analytic error	analytic result	LTspice	PWMSim↔LTspice delta	LTspice parity
v_C peak overshoot (V)	1+exp(-zeta*pi/sqrt(1-zeta^2)), zeta=0.158	1.60468	1.6047	0.00%	PASS	1.60473	0.00% (1% rel)	PASS
time to peak (after step) (us)	pi/wd, wd=w0*sqrt(1-zeta^2)	100.611	100.87	0.26%	PASS	100.053	0.82% (2% rel)	PASS
final value (V)	DC gain = 1	1	0.99996	0.00%	PASS	0.99996	0.00% (0.2% rel)	PASS

measurement recipes: v_C peak overshoot — MAX(V(b)) over the full .tran; time to peak (after step) — time of MAX(V(b)) minus 100us step time; final value — AVG(V(b)) over the last 0.1ms

buck_ccm

download netlist — measured by the PWMSim switched-linear evidence harness

Measured boundary: periodic output-voltage and inductor-current operating point · LTspice parity: 10/10 measures pass
Not tested: edge-aligned waveform error, startup/load transients, losses, device stress, and timestep convergence

metric	analytic reference	expected	PWMSim	analytic error	analytic result	LTspice	PWMSim↔LTspice delta	LTspice parity
output voltage mean (V)	Vout = D*Vin	6	5.9978	0.04%	PASS	6.00783	0.17% (2% rel)	PASS
output voltage RMS (V)	same-netlist operating-point measure	-	5.9978	-	NOT GATED	6.00783	0.17% (2% rel)	PASS
output voltage minimum (V)	same-netlist operating-point measure	-	5.9948	-	NOT GATED	6.00484	0.17% (5% rel)	PASS
output voltage maximum (V)	same-netlist operating-point measure	-	6.0011	-	NOT GATED	6.01139	0.17% (5% rel)	PASS
output voltage peak-to-peak (V)	order: di/(8fswCo)	[0.00187432 .. 0.00937162]	0.0063264	in [0.00187432, 0.00937162]	PASS	0.00655537	3.49% (10% rel or 0.05 V abs)	PASS
inductor current mean (A)	same-netlist operating-point measure	-	1.5008	-	NOT GATED	1.50053	0.02% (2% rel)	PASS
inductor current RMS (A)	same-netlist operating-point measure	-	1.5033	-	NOT GATED	1.50302	0.02% (2% rel)	PASS
inductor current minimum (A)	CCM requires I(L1) > 1 mA	[0.001 .. inf]	1.3496	in [0.001, inf]	PASS	1.34997	0.03% (5% rel or 0.001 A abs)	PASS
inductor current maximum (A)	same-netlist operating-point measure	-	1.6512	-	NOT GATED	1.65086	0.02% (5% rel)	PASS
inductor current peak-to-peak (A)	di = Vout(1-D)/(Lfsw)	0.299892	0.30162	0.57%	PASS	0.300896	0.24% (10% rel or 0.15 A abs)	PASS

measurement recipes: output voltage mean — MEAN(V(out)) on a 4001-point uniform grid over the last 20 switching periods; output voltage RMS — RMS(V(out)) on a 4001-point uniform grid over the last 20 switching periods; output voltage minimum — MINIMUM(V(out)) on a 4001-point uniform grid over the last 20 switching periods; output voltage maximum — MAXIMUM(V(out)) on a 4001-point uniform grid over the last 20 switching periods; output voltage peak-to-peak — PEAK-TO-PEAK(V(out)) on a 4001-point uniform grid over the last 20 switching periods; inductor current mean — MEAN(I(L1)) on a 4001-point uniform grid over the last 20 switching periods; inductor current RMS — RMS(I(L1)) on a 4001-point uniform grid over the last 20 switching periods; inductor current minimum — MINIMUM(I(L1)) on a 4001-point uniform grid over the last 20 switching periods; inductor current maximum — MAXIMUM(I(L1)) on a 4001-point uniform grid over the last 20 switching periods; inductor current peak-to-peak — PEAK-TO-PEAK(I(L1)) on a 4001-point uniform grid over the last 20 switching periods

buck_dcm

download netlist — measured by the PWMSim switched-linear evidence harness

metric	analytic reference	expected	PWMSim	analytic error	analytic result	LTspice	PWMSim↔LTspice delta	LTspice parity
output voltage mean (V)	Erickson M=2/(1+sqrt(1+4K/D^2)), K=2L/(R*Ts)	7.65703	7.6571	0.00%	PASS	7.66884	0.15% (2% rel)	PASS
output voltage RMS (V)	same-netlist operating-point measure	-	7.6571	-	NOT GATED	7.66884	0.15% (2% rel)	PASS
output voltage minimum (V)	same-netlist operating-point measure	-	7.6527	-	NOT GATED	7.66404	0.15% (5% rel)	PASS
output voltage maximum (V)	same-netlist operating-point measure	-	7.6616	-	NOT GATED	7.67396	0.16% (5% rel)	PASS
output voltage peak-to-peak (V)	same-netlist operating-point measure	-	0.0088421	-	NOT GATED	0.00991976	10.86% (10% rel or 0.05 V abs)	PASS
inductor current mean (A)	same-netlist operating-point measure	-	0.15324	-	NOT GATED	0.152866	0.25% (2% rel)	PASS
inductor current RMS (A)	same-netlist operating-point measure	-	0.25809	-	NOT GATED	0.257511	0.23% (2% rel)	PASS
inductor current minimum (A)	DCM reaches the ±1 mA zero neighborhood	[-0.001 .. 0.001]	-3.3193e-06	in [-0.001, 0.001]	PASS	4.3264e-06	176.72% (5% rel or 0.001 A abs)	PASS
inductor current maximum (A)	same-netlist operating-point measure	-	0.65181	-	NOT GATED	0.649938	0.29% (5% rel)	PASS
inductor current peak-to-peak (A)	same-netlist operating-point measure	-	0.65181	-	NOT GATED	0.649934	0.29% (10% rel or 0.15 A abs)	PASS

boost_ccm

download netlist — measured by the PWMSim switched-linear evidence harness

metric	analytic reference	expected	PWMSim	analytic error	analytic result	LTspice	PWMSim↔LTspice delta	LTspice parity
output voltage mean (V)	Vout = Vin/(1-D)	24	23.996	0.02%	PASS	24.0028	0.03% (2% rel)	PASS
output voltage RMS (V)	same-netlist operating-point measure	-	23.996	-	NOT GATED	24.0028	0.03% (2% rel)	PASS
output voltage minimum (V)	same-netlist operating-point measure	-	23.924	-	NOT GATED	23.9358	0.05% (5% rel)	PASS
output voltage maximum (V)	same-netlist operating-point measure	-	24.062	-	NOT GATED	24.0648	0.01% (5% rel)	PASS
output voltage peak-to-peak (V)	same-netlist operating-point measure	-	0.13794	-	NOT GATED	0.129018	6.92% (10% rel or 0.05 V abs)	PASS
inductor current mean (A)	same-netlist operating-point measure	-	2.4043	-	NOT GATED	2.40136	0.12% (2% rel)	PASS
inductor current RMS (A)	same-netlist operating-point measure	-	2.4105	-	NOT GATED	2.40757	0.12% (2% rel)	PASS
inductor current minimum (A)	CCM requires I(L1) > 1 mA	[0.001 .. inf]	2.1013	in [0.001, inf]	PASS	2.09825	0.15% (5% rel or 0.001 A abs)	PASS
inductor current maximum (A)	same-netlist operating-point measure	-	2.7051	-	NOT GATED	2.70307	0.07% (5% rel)	PASS
inductor current peak-to-peak (A)	same-netlist operating-point measure	-	0.60376	-	NOT GATED	0.604815	0.17% (10% rel or 0.15 A abs)	PASS

measurement recipes: output voltage mean — MEAN(V(out)) on a 4001-point uniform grid over the last 20 switching periods (the deck allows 12 ms settling; RC≈1 ms); output voltage RMS — RMS(V(out)) on a 4001-point uniform grid over the last 20 switching periods; output voltage minimum — MINIMUM(V(out)) on a 4001-point uniform grid over the last 20 switching periods; output voltage maximum — MAXIMUM(V(out)) on a 4001-point uniform grid over the last 20 switching periods; output voltage peak-to-peak — PEAK-TO-PEAK(V(out)) on a 4001-point uniform grid over the last 20 switching periods; inductor current mean — MEAN(I(L1)) on a 4001-point uniform grid over the last 20 switching periods; inductor current RMS — RMS(I(L1)) on a 4001-point uniform grid over the last 20 switching periods; inductor current minimum — MINIMUM(I(L1)) on a 4001-point uniform grid over the last 20 switching periods; inductor current maximum — MAXIMUM(I(L1)) on a 4001-point uniform grid over the last 20 switching periods; inductor current peak-to-peak — PEAK-TO-PEAK(I(L1)) on a 4001-point uniform grid over the last 20 switching periods

rectifier_diode

download netlist — measured by the PWMSim nonlinear evidence harness

Measured boundary: bounded output peak and mean · LTspice parity: 2/2 measures pass
Not tested: diode-current waveform, loss, temperature, and timestep convergence

metric	analytic reference	expected	PWMSim	analytic error	analytic result	LTspice	PWMSim↔LTspice delta	LTspice parity
peak rectified Vout (V)	5V peak minus exponential-junction drop under load	[3.6 .. 3.95]	3.7771	in [3.6, 3.95]	PASS	3.77677	0.01% (2% rel)	PASS
mean Vout (t>2ms) (V)	peak minus RC droop (tau=R*C=10ms >> half-cycle)	[3 .. 3.7]	3.4591	in [3, 3.7]	PASS	3.45885	0.01% (2% rel)	PASS

measurement recipes: peak rectified Vout — MAX(V(out)); the diode uses .model Is=1e-14 N=1.2; mean Vout (t>2ms) — AVG(V(out)) from 2ms to 6ms

buck_rr_loss

download netlist — measured by the PWMSim compiled evidence harness (reverse-recovery co-simulation)

Measured boundary: steady-state efficiency and reverse-recovery loss delta · LTspice parity: 3/3 measures pass
Not tested: device-stress waveform parity, temperature, and hardware equivalence

metric	analytic reference	expected	PWMSim	analytic error	analytic result	LTspice	PWMSim↔LTspice delta	LTspice parity
efficiency, TT=0 baseline (%)	PWMSim reference (validation Tier 24)	95.94	95.944	0.00%	PASS	95.4263	0.54% (2% rel)	PASS
efficiency, TT=100ns (%)	PWMSim reference (validation Tier 24)	90.72	90.722	0.00%	PASS	89.629	1.22% (2% rel)	PASS
recovery loss delta (mW)	loss(TT=100n) - loss(TT=0); ideal diode predicts 0	296.8	296.8	0.00%	PASS	335.076	11.42% (15% rel)	PASS

measurement recipes: efficiency, TT=0 baseline — Pout/Pin over last 30 periods; Pin=Vin*I(S1), Pout=V(out)^2/R; set diode TT=0 Cjo=50p; efficiency, TT=100ns — same, with the netlist's TT=100n diode model; recovery loss delta — difference of (Pin-Pout) between the two runs

Prove us wrong. Download a netlist, follow the measurement steps, and compare. If a number is wrong, please report it. The correctness policy explains how PWMSim will respond.

Generated from the checked-in scorecard and validation records, which are the sources of truth. The records ship beside this page unedited, in the internal name the harness wrote them under.