{ "protocol": { "name": "CVP", "version": "1.0.0-proposed", "revision": "2026-09-13", "spec_sha256": "f62725968356c92930531cd6085db76e216da06e95be53d636b0d2cf3218b148", "spec": "https://www.calculatorx.com/developers/cvp/spec/1.0" }, "document_status": "proposed", "calculator": { "id": "mosfet-conduction-loss", "version": "1.2.2", "title": "MOSFET Conduction Loss Calculator", "formula_family": "i2r-conduction", "capability_id": "electrical.mosfet.conduction_loss" }, "profile": "engineering", "status": "VERIFIED", "verification_status": "VERIFIED", "production_freshness": "CURRENT", "overall_trust": "VERIFIED", "runner": { "name": "cvp-runner", "version": "1.0.0" }, "environment": { "runtime": "node", "runtime_version": "20.19.2", "numeric_model": "IEEE-754 binary64", "os": "darwin" }, "suite": { "id": "mosfet-conduction-loss", "version": "1.2.2", "uri": "https://www.calculatorx.com/evidence/electrical.mosfet.conduction_loss/1.2.2.json" }, "obligation_set": [ "CVP-PROV-01", "CVP-MODEL-01", "CVP-SCOPE-01", "CVP-UNIT-01", "CVP-REF-01", "CVP-GOLD-01", "CVP-BND-01", "CVP-INV-01", "CVP-NUM-01", "CVP-COV-01", "CVP-CONTRACT-01", "CVP-DEP-01", "CVP-ART-01", "CVP-PROD-01", "CVP-DIM-01", "CVP-PROP-01", "CVP-IFACE-01" ], "provenance": { "mode": "direct", "sources": [ { "label": "IEC 60747-8 — Semiconductor devices — Discrete devices — Part 8: Field-effect transistors", "kind": "standard", "reference": "Drain-source on-state resistance RDS(on)" }, { "label": "Infineon — OptiMOS device selection for synchronous rectification", "kind": "other", "reference": "Conduction losses P_cond = I_RMS² × RDS(on)", "url": "https://www.infineon.com/dgdl/Infineon-MOSFET_OptiMOS_device_selection_for_synchronous_rectification-ApplicationNotes-v01_00-EN.pdf?fileId=8ac78c8c85ecb34701865afe0f7d3f05" }, { "label": "Texas Instruments SSZTB57 — How to Minimize MOSFET Conduction Loss in Battery-Powered Applications", "kind": "other", "reference": "P_cond = I_RMS² × RDS(on)", "url": "https://www.ti.com/lit/pdf/ssztb57" }, { "label": "Erickson & Maksimović — Fundamentals of Power Electronics", "kind": "other", "reference": "Conduction loss in semiconductor switches" }, { "label": "NIST Guide to the SI (SP 811)", "kind": "other", "reference": "SI units for current, resistance, and power", "url": "https://www.nist.gov/pml/special-publication-811" } ] }, "reference": { "items": [ { "class": "O1", "reference_scope": "model", "scope": "model", "label": "Published I²R conduction loss with current_basis semantics" }, { "class": "O2", "reference_scope": "expected_values", "scope": "expected_values", "label": "Separate-module MOSFET conduction-loss oracle — same V8 binary64 as IUT", "engine": { "name": "mosfet-conduction-reference", "precision_bits": 53, "independent_of_iut": true } }, { "class": "O2", "reference_scope": "numerical_behavior", "scope": "numerical_behavior", "label": "Same O2 module backs ≤2 ULP P_W comparison vs IUT", "engine": { "name": "mosfet-conduction-reference", "precision_bits": 53, "independent_of_iut": true } } ], "notes": "Golden expected values use a separate O2 module (not IUT transcription). O2 shares Node/V8 binary64 with the IUT unless noted otherwise." }, "controls": { "CVP-PROV-01": { "result": "PASS", "applicability": "required", "notes": "Sources present on evidence" }, "CVP-MODEL-01": { "result": "PASS", "applicability": "required", "notes": "P = I²·Rds·D_eff with required current_basis contract" }, "CVP-SCOPE-01": { "result": "PASS", "applicability": "required", "notes": "Conduction only — switching/Coss/Qrr excluded; temperature none in this CVP wave goldens" }, "CVP-UNIT-01": { "result": "PASS", "applicability": "required", "notes": "A, Ω, W" }, "CVP-REF-01": { "result": "PASS", "applicability": "required", "notes": "O1 model + O2 expected_values + O2 numerical_behavior" }, "CVP-GOLD-01": { "result": "PASS", "applicability": "required", "notes": "7/7 legacy golden; 3/3 oracle-backed numeric" }, "CVP-BND-01": { "result": "PASS", "applicability": "required", "notes": "11/11 CVP boundary · 13/13 legacy Evidence boundary" }, "CVP-INV-01": { "result": "PASS", "applicability": "required", "notes": "13 invalid-domain cases" }, "CVP-NUM-01": { "result": "PASS", "applicability": "required", "notes": "max_error_observed_ulp=0; policy declared a priori" }, "CVP-COV-01": { "result": "PASS", "applicability": "required", "notes": "4/4 declared partitions (dc, on_interval_rms, full_cycle_rms, invalid-domain) · 7 legacy golden / 11 CVP boundary unique cases · 13 Evidence invalid-input (may overlap boundary)" }, "CVP-CONTRACT-01": { "result": "PASS", "applicability": "required", "notes": "12/12 CVP contract" }, "CVP-DEP-01": { "result": "PASS", "applicability": "required", "notes": "engine mosfet-conduction-loss; Node binary64" }, "CVP-ART-01": { "result": "PASS", "applicability": "required", "notes": "release_integrity.status=verified · digests: artifact_evidence_sha256=Evidence core (Trust freshness) · cvp_evidence_digest=artifacts.evidence_digest (fingerprint v2) · evidence_bundle_sha256=legacy Evidence JSON bytes · evidence_catalog_digest=attested_catalog_sha256 · production_sha256=bound production report · see artifacts.digest_registry" }, "CVP-PROD-01": { "result": "PASS", "applicability": "required", "notes": "this calculator CURRENT · bound snapshot pass @ 2026-09-17T02:55:18.640Z · live site-wide report stale @ 2026-09-17T03:03:41.783Z (20 other capabilities) · local checks pass · attestation_id=9449647b8bd74c22920923aea417bdcbfdf5afdff03aabbbfd1a2f380d1c6376 · STALE · Last attested schema matched 1.2.2 snapshot / local build · Semantic contract ✓ · Last attestation PASS · current evidence changed · re-attestation required · Public/cache ✓ · Origin ✓ · schema_const=1.2.2 · report output-const=pass · evidence-sha256=pass · semantic-contract=pass · capability-html-public-origin-agree=pass · cvp-manifest-public-origin-agree=pass · cvp-latest-alias-agrees=pass · calculator-html-cvp-projection=pass · evidence-html-cvp-projection=pass · attested_evidence_sha256=1548e9bf92b1d59110a635420e9499ad9db828cae614e9d2a10e40ecea9ac29d · verified_at=2026-09-16T23:18:56.537Z · evidence_attested_at=2026-09-16T23:18:56.537Z · last_confirmed_current_at=2026-09-17T02:55:18.640Z · rendered_at=2026-09-17T03:03:41.820Z · binds=cvp_core_sha256", "check_result": "PASS", "production_state": "CURRENT", "binding_current": true }, "CVP-DIM-01": { "result": "PASS", "applicability": "applicable", "notes": "Power from current and resistance" }, "CVP-PROP-01": { "result": "PASS", "applicability": "applicable", "notes": "8/8 property" }, "CVP-META-01": { "result": "SKIP", "applicability": "not_applicable", "notes": "No input→output transformation vectors in pack — control not in obligation set" }, "CVP-ROUND-01": { "result": "SKIP", "applicability": "not_applicable", "notes": "No inverse / round-trip vectors in pack — control not in obligation set" }, "CVP-XCAL-01": { "result": "SKIP", "applicability": "not_applicable", "notes": "No related calculator in the same formula family / no related-identity peers declared — control not in obligation set" }, "CVP-IFACE-01": { "result": "PASS", "applicability": "applicable", "notes": "UI (SSR) · REST · MCP equivalent (MCP uses calc API handler). ui-ssr is query-result HTML, not a live browser session." }, "CVP-ORACLE-01": { "result": "SKIP", "applicability": "higher_assurance", "notes": "O2 present; O3 not required this wave" }, "CVP-EXP-01": { "result": "SKIP", "applicability": "optional", "notes": "CalculatorX internal domain review — not CVP-EXP-01" } }, "tests": { "golden": { "passed": 3, "total": 3, "failed": 0, "case_ids": [ "g-dc", "g-on-half", "g-full-cycle" ] }, "boundary": { "passed": 11, "total": 11, "failed": 0, "case_ids": [ "legacy-omitted-basis", "boundary-missing-I", "boundary-missing-Rds", "boundary-zero-I", "boundary-zero-Rds", "boundary-zero-duty", "boundary-bad-duty", "boundary-nan-Rds", "boundary-zero-rds-ratio", "boundary-linear-needs-tj", "boundary-linear-factor-nonpositive" ] }, "invalid": { "passed": 13, "total": 13, "failed": 0, "case_ids": [ "legacy-omitted-basis", "boundary-missing-I", "boundary-missing-Rds", "boundary-zero-I", "boundary-zero-Rds", "boundary-zero-duty", "boundary-bad-duty", "boundary-nan-Rds", "boundary-invalid-basis", "boundary-invalid-temp-model", "boundary-zero-rds-ratio", "boundary-linear-needs-tj", "boundary-linear-factor-nonpositive" ] }, "property": { "passed": 8, "total": 8, "failed": 0, "case_ids": [ "property-vdrop", "property-i2", "property-rds", "property-duty-on-interval", "property-full-cycle-ignores-duty", "property-rms-equivalence", "property-ratio-scales-p", "property-linear-at-tref" ], "kind": "fixed" }, "round_trip": { "passed": 0, "total": 0, "failed": 0, "case_ids": [] }, "metamorphic": { "passed": 0, "total": 0, "failed": 0, "case_ids": [] }, "contract": { "passed": 12, "total": 12, "failed": 0 }, "cross_interface": { "passed": 2, "total": 2, "failed": 0, "case_ids": [ "iface-dc", "iface-pwm" ] } }, "coverage": { "partitions": [ { "id": "dc", "description": "DC basis", "exercised": true, "case_count": 10 }, { "id": "on_interval_rms", "description": "ON-interval RMS", "exercised": true, "case_count": 5 }, { "id": "full_cycle_rms", "description": "Full-cycle RMS", "exercised": true, "case_count": 5 }, { "id": "invalid-domain", "description": "Invalid inputs", "exercised": true, "case_count": 13 } ] }, "numerical": { "representation": "IEEE-754 binary64", "tolerance": { "type": "ulp", "value": 2, "rationale": "I²R elementary ops; ≤2 ULP vs separate-module O2 (same V8). Declared a priori.", "declared_before_evaluation": true }, "max_error_observed": 0, "records": [ { "id": "g-dc", "reference": { "P_W": 5, "V_drop": 0.5, "I": 10, "Rds": 0.05, "Rds_Tj": 0.05, "D": 1, "current_basis": "dc", "temperature_model": "none", "rds_ratio": 1 }, "actual": { "P_W": 5, "V_drop": 0.5, "I": 10, "Rds": 0.05, "Rds_Tj": 0.05, "D": 1, "current_basis": "dc", "temperature_model": "none", "rds_ratio": 1 }, "error_ulp": 0, "threshold_ulp": 2, "suite": "golden" }, { "id": "g-on-half", "reference": { "P_W": 2.5, "V_drop": 0.5, "I": 10, "Rds": 0.05, "Rds_Tj": 0.05, "D": 0.5, "current_basis": "on_interval_rms", "temperature_model": "none", "rds_ratio": 1 }, "actual": { "P_W": 2.5, "V_drop": 0.5, "I": 10, "Rds": 0.05, "Rds_Tj": 0.05, "D": 0.5, "current_basis": "on_interval_rms", "temperature_model": "none", "rds_ratio": 1 }, "error_ulp": 0, "threshold_ulp": 2, "suite": "golden" }, { "id": "g-full-cycle", "reference": { "P_W": 5, "V_drop": 0.5, "I": 10, "Rds": 0.05, "Rds_Tj": 0.05, "D": 1, "current_basis": "full_cycle_rms", "temperature_model": "none", "rds_ratio": 1 }, "actual": { "P_W": 5, "V_drop": 0.5, "I": 10, "Rds": 0.05, "Rds_Tj": 0.05, "D": 1, "current_basis": "full_cycle_rms", "temperature_model": "none", "rds_ratio": 1, "warnings": [ { "code": "VDS_AT_ENTERED_CURRENT", "severity": "info", "detail": "V_drop = I·Rds at the entered full-cycle RMS current; it is not instantaneous VDS(on) during the ON interval." } ] }, "error_ulp": 0, "threshold_ulp": 2, "suite": "golden" } ] }, "interfaces": { "compared": [ "ui-ssr", "rest", "mcp" ], "result": "PASS", "notes": "UI (SSR) · REST · MCP equivalent (MCP uses calc API handler). ui-ssr is query-result HTML, not a live browser session." }, "artifacts": { "evidence_bundle_sha256": "4d8d4f16be88865d962e6256922681472dbd5b36502acc315d21340bae751661", "evidence_digest": "c903606f0668c4949a7d9a33fceaeab6b5188440efa99a7c254458c26aa55567", "production_sha256": "1548e9bf92b1d59110a635420e9499ad9db828cae614e9d2a10e40ecea9ac29d", "attested_catalog_sha256": "30232253fa80d72900e4b9afa27212ebd9f4e44957813089ef3e67d794e4e41b", "production_checks": [ { "id": "electrical.mosfet.conduction_loss:output-const", "status": "pass", "detail": "output const 1.2.2 vs capability 1.2.2", "scope": "last_attestation_snapshot", "current": true, "attestation_binding_current": true, "attested_at": "2026-09-16T23:18:56.537Z" }, { "id": "electrical.mosfet.conduction_loss:evidence-sha256", "status": "pass", "detail": "e74c3de4a203", "scope": "last_attestation_snapshot", "current": true, "attestation_binding_current": true, "attested_at": "2026-09-16T23:18:56.537Z" }, { "id": "electrical.mosfet.conduction_loss:semantic-contract", "status": "pass", "detail": "32/32", "scope": "last_attestation_snapshot", "current": true, "attestation_binding_current": true, "attested_at": "2026-09-16T23:18:56.537Z" }, { "id": "electrical.mosfet.conduction_loss:capability-html-public-origin-agree", "status": "pass", "detail": "public 1.2.2 vs origin 1.2.2", "scope": "last_attestation_snapshot", "current": true, "attestation_binding_current": true, "attested_at": "2026-09-16T23:18:56.537Z" }, { "id": "electrical.mosfet.conduction_loss:cvp-manifest-public-origin-agree", "status": "pass", "detail": "electrical.mosfet.conduction_loss/1.2.2/-/engineering/c903606f0668", "scope": "last_attestation_snapshot", "current": true, "attestation_binding_current": true, "attested_at": "2026-09-16T23:18:56.537Z", "projection_compared": false }, { "id": "electrical.mosfet.conduction_loss:cvp-latest-alias-agrees", "status": "pass", "detail": "electrical.mosfet.conduction_loss/1.2.2/-/engineering/c903606f0668", "scope": "last_attestation_snapshot", "current": true, "attestation_binding_current": true, "attested_at": "2026-09-16T23:18:56.537Z", "projection_compared": false }, { "id": "electrical.mosfet.conduction_loss:calculator-html-cvp-projection", "status": "pass", "detail": "matches Trust display", "scope": "last_attestation_snapshot", "current": true, "attestation_binding_current": true, "attested_at": "2026-09-16T23:18:56.537Z" }, { "id": "electrical.mosfet.conduction_loss:evidence-html-cvp-projection", "status": "pass", "detail": "matches Trust display", "scope": "last_attestation_snapshot", "current": true, "attestation_binding_current": true, "attested_at": "2026-09-16T23:18:56.537Z" } ], "digest_registry": { "digest_algorithm": "sha256", "canonicalization": "json-sorted-keys-utf8", "entries": [ { "name": "cvp_core_sha256", "field": "artifacts.cvp_core_sha256", "digest_scope": "cvp_verification_fingerprint_v2", "value": "c903606f0668c4949a7d9a33fceaeab6b5188440efa99a7c254458c26aa55567", "note": "Immutable verification core; excludes attestation/live-status and Evidence contract counts" }, { "name": "cvp_evidence_digest", "field": "artifacts.evidence_digest", "digest_scope": "cvp_verification_fingerprint_v2", "value": "c903606f0668c4949a7d9a33fceaeab6b5188440efa99a7c254458c26aa55567", "note": "Alias of cvp_core_sha256 (historical field name)" }, { "name": "artifact_evidence_sha256", "field": "release_integrity.digests.evidence_core_sha256", "digest_scope": "evidence_artifact_core", "value": "e74c3de4a203cfa18cd8bf6e3b947d83c5cea6b22fc85125f5777a12b7b6bd11", "note": "Published Evidence JSON core — Trust freshness / production bind subject" }, { "name": "evidence_catalog_digest", "field": "artifacts.attested_catalog_sha256", "digest_scope": "capability_catalog", "value": "30232253fa80d72900e4b9afa27212ebd9f4e44957813089ef3e67d794e4e41b", "note": "Capability catalog integrity; site-wide, not per-suite fingerprint" } ] }, "cvp_core_sha256": "c903606f0668c4949a7d9a33fceaeab6b5188440efa99a7c254458c26aa55567" }, "dependencies": [ { "name": "mosfet-conduction-loss-engine", "version": "1.2.2" }, { "name": "mosfet-conduction-loss-reference-oracle", "version": "1.0.0" }, { "name": "node", "version": "20.19.2" } ], "attestation": { "status": "CURRENT", "href": "/.well-known/calculatorx-production-attestation.json", "id": "9449647b8bd74c22920923aea417bdcbfdf5afdff03aabbbfd1a2f380d1c6376", "attested_at": "2026-09-16T23:18:56.537Z", "last_confirmed_current_at": "2026-09-17T02:55:18.640Z", "site_attestation_current": false, "capability_attestation_current": true, "bound_snapshot_status": "pass", "live_report_status": "stale", "bound_attested_at": "2026-09-17T02:55:18.640Z", "live_updated_at": "2026-09-17T03:03:41.783Z", "bound_snapshot": { "status": "pass", "attested_at": "2026-09-17T02:55:18.640Z", "site_stale_count": 20 }, "live_site_status": { "href": "/.well-known/calculatorx-production-attestation.json" }, "bound_snapshot_site_stale_count": 20, "site_stale_capability_count": 20, "evidence_attested_at": "2026-09-16T23:18:56.537Z" }, "domain_review": { "status": "ABSENT", "spec_version": "1.2.2", "external_third_party": false, "note": "Supplemental CalculatorX internal domain review — see internal_review" }, "internal_review": { "status": "PASS", "reviewer_role": "electrical-engineer", "reviewed_by": "CalculatorX electrical review (EE-001)", "spec_version": "1.2.2", "independence": "internal", "external_third_party": false }, "timestamps": { "verified_at": "2026-09-16T23:18:56.537Z", "generated_at": "2026-09-16T23:18:56.537Z", "rendered_at": "2026-09-17T03:03:41.820Z", "notes": "verified_at/generated_at mark the first publication of this cvp_core_sha256 (artifacts.evidence_digest alias) for suite verification. evidence_attested_at/attested_at is the first production bind of that core digest. last_confirmed_current_at is the latest site-wide report that still confirms CURRENT. rendered_at is this JSON serialization and is not part of cvp_core_sha256 / evidence_digest. Production attestation binds cvp_core_sha256 (binds evidence_digest). Causal order: verified_at ≤ evidence_attested_at ≤ last_confirmed_current_at. attestation.bound_snapshot.site_stale_count is the site-wide stale capability count at Manifest bind time — not a live value. Fetch attestation.live_site_status.href for the current site report." }, "links": { "legacy_evidence": "https://www.calculatorx.com/evidence/electrical.mosfet.conduction_loss/1.2.2.json", "evidence_page": "https://www.calculatorx.com/evidence/electrical.mosfet.conduction_loss/1.2.2", "calculator": "https://www.calculatorx.com/calc/electric/mosfet-conduction-loss", "schema": "https://www.calculatorx.com/developers/cvp/schema/cvp-evidence-1.0.json", "protocol": "https://www.calculatorx.com/developers/cvp/spec/1.0", "manifest": "https://www.calculatorx.com/evidence/electrical.mosfet.conduction_loss/1.2.2.cvp.json" } }