Public evidence

electrical.buck.ripple

Machine-checked verification for calculation version 1.1.0 · tier internally_reviewed

Open calculator API Capability Download JSON CVP Manifest MCP Review policy

CVP status

Ideal CCM assumed, not measured. No Iout, so CCM/DCM is not certified. ESR, DCM, and current-mode dynamics are out of scope.

Declared partition coverage: PASS · 3/3 declared partitions (ccm-with-c, ccm-without-c, invalid-domain)
Versions: Calculation 1.1.0 · CVP protocol 1.0.0-proposed · Evidence 2026-09-11.ptp-ccm-c-optional
Verification revision: 2026-09-11.ptp-ccm-c-optional · 4/4 property · digest 332ecf117919

Verification

Legacy regression suite: 15/15 calculation tests · Production surface contract 6/6

Three distinct suites: educational examples on the calculator page, this legacy regression count (15/15 golden + boundary), and the CVP verification suite below. They are not the same number. Property, metamorphic, round-trip, O3, and interface statuses/checks are recorded in the CVP Manifest . SKIP (0/0) means that suite has no published vectors.

This calculator CURRENT · Public schema 1.1.0 matches · Semantic contract ✓ · Production attested · Public/cache ✓ · Origin ✓

CVP verification suite

Protocol checks from the Evidence Manifest. Distinct from the legacy regression suite above. Verification revision 2026-09-11.ptp-ccm-c-optional. Calculation version 1.1.0. CVP 1.0.0-proposed. 2/2 golden · 12/12 CVP boundary · 15/15 invalid · 4/4 property · 4/4 metamorphic · 2/2 cross-interface · 4/4 CVP contract. digest 332ecf117919.

Golden (oracle-backed) 2 / 2
CVP boundary 12 / 12
Invalid input 15 / 15
Property 4 / 4
Metamorphic 4 / 4
Cross-interface 2 / 2
CVP contract 4 / 4
Interfaces PASS · UI (SSR) / REST / MCP
Interface claim ui-ssr is query-result HTML, not a live browser session.
Assurance Engineering

release artifacts aligned PASS
schema output required declared PASS
schema valid input executes PASS
engine success output validates schema PASS
schema rejects incomplete input PASS
rest success payload validates schema PASS

Fingerprint sha256:1927974088aa4a98fa7d13d6207fd67d80a32a55485475972c6dcfb22939db70

Input schema sha256:c877e8a833a24fc7d74ecd9af3a2d84df1aa2d5c82b0076e7d2a965ba872ea5d · Output schema sha256:800d2d0f8dca7da1b6f17b885c435390030c1a705a4444e66484757b3c7498d6 · Build-time SHA-256 digests prove published artifacts agree with each other (release_integrity.scope=workspace). Production attestation GETs canonical URLs twice (public/cached view and origin), including Capability HTML, via npm run attest:production --write (published at /.well-known/calculatorx-production-attestation.json) and fails if the public Capability page advertises a different calculation_version. This is artifact consistency, not an independent immutable release log.

Build & scope

Engine identity and declared limitations.

Tool: buck-ripple
Engine: buck-ripple
Engine build: 2026-09-11
Evidence core: 2026-09-11T14:08:29.678Z
Rendered: 2026-11-10T05:18:41.895Z
Last reviewed: 2026-09-11

Assumptions

Ideal CCM is assumed (not measured); valid when Iout > ΔI_L,pp/2
dI_L_A and dV_out_V are peak-to-peak
ΔV_C neglects ESR; capacitor-only ripple

Limitations

Ideal CCM is assumed, not measured — no Iout, so CCM/DCM is not certified
ΔI_L_A and ΔV_out_V are peak-to-peak, not RMS or amplitude
ΔV_out_V is capacitor-only (ESR=0); ESR and switching transients are neglected
DCM, current-mode control dynamics, and non-ideal switch/diode drops are out of scope

Sources

Standards and references supporting this tool specification. Methods are listed separately — they are algorithms, not bibliographic sources.

Texas Instruments SLVA477B — Basic Calculation of a Buck Converter's Power Stage — Inductor ripple current; output capacitor C_OUT = ΔI_L/(8 f ΔV)
Supports: ΔI_L,pp = Vout(1−D)/(f L) and the 8fC capacitor relation
Analog Devices AN-1144 — Measuring Output Ripple and Switching Transients in Switching Regulators — Peak-to-peak ripple, triangular capacitor current, ESR contribution
Supports: ΔI_L is peak-to-peak; ESR adds to capacitive ΔV
Erickson / Maksimović — Fundamentals of Power Electronics — CCM buck inductor current ripple and output capacitor ΔV ≈ ΔI/(8fC)
Supports: Ideal ESR=0 capacitor ripple estimate under triangular inductor current

Verification disclosure

Aggregate outcomes, scope and artifact commitments are public. Complete test inputs, expected values, execution records and oracle infrastructure are retained privately. This summary does not independently reproduce the full verification run.