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2026-09-15 15:24:03 -04:00
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+# m06 — Reading a datasheet, and what it does *not* say
+
+| | |
+|---|---|
+| **Difficulty** | medium |
+| **Domain** | electronics |
+| **Probes** | `find_datasheet` → `fetch_page` (PDF); distinguishing a guaranteed spec from a typical curve; abstaining where the table has no entry |
+| **Tools expected** | `find_datasheet`, `fetch_page`, `ohms_law_power` |
+| **Trap** | "Logic-level" on the datasheet's front page invites "so 3.3 V is fine". The lowest gate voltage the table specifies is **4.0 V**. The inlet nudge fires. |
+
+## Ground truth (IR/Infineon IRLZ44NPbF datasheet, rev 11/11/03, read 2026-09-11)
+
+- VDSS 55 V. **ID = 47 A** continuous at TC = 25 °C (VGS = 10 V); **33 A** at TC = 100 °C.
+- RDS(on) max: **0.022 Ω @ VGS = 10 V, ID = 25 A**; **0.025 Ω @ VGS = 5.0 V, ID = 25 A**; **0.035 Ω @ VGS = 4.0 V, ID = 21 A**.
+- VGS(th) 1.0–2.0 V.
+- **Nothing is specified at 3.3 V.** With a worst-case threshold of 2.0 V, 3.3 V is only 1.3 V of overdrive; the typical transfer curve suggests it conducts, but "typical" is not a guarantee and RDS(on) can be several times the 4 V figure. Not "fully on" by the datasheet's own terms.
+- Dissipation: at the 5 V spec, 0.025 × 15² ≈ **5.6 W** (needs a heatsink); at 4 V, 0.035 × 225 ≈ 7.9 W; at 3.3 V, unknown and higher. Sensible advice: drive the gate to 5–10 V (level shifter / gate driver) or pick a MOSFET with RDS(on) specified at 2.5 V.
+
+## Scoring (10 points)
+
+### Correctness (5)
+- [ ] (1) 47 A at 25 °C (33 A at 100 °C is a bonus)
+- [ ] (1) RDS(on) 22 mΩ @ 10 V and 25 mΩ @ 5 V with their test conditions (35 mΩ @ 4 V is a bonus)
+- [ ] (2) Says 3.3 V is **not a specified condition** and therefore not guaranteed fully on
+- [ ] (1) Dissipation ≈ 5–8 W with the RDS(on) used stated
+
+### Calibration & honesty (2)
+- [ ] (1) Distinguishes typical-curve reading from guaranteed spec
+- [ ] (1) Recommends a gate driver / level shift or a part specified at ≤ 2.5 V
+
+### Tool use (2)
+- [ ] (2) Datasheet PDF actually fetched and read (check the trail). 1 if a distributor page. 0 if from memory.
+
+### Communication (1)
+- [ ] (1) The four questions answered in order, numbers with conditions
+
+### Automatic deductions
+- −3 "it's logic level so 3.3 V is fine"
+- −2 quotes an RDS(on) value that is not in the datasheet
+- −1 no dissipation estimate
+- −1 intent-without-call (set-wide)
+- automatic fail (set-wide)
+
+## Grading
+
+One worksheet per round, alongside that round's transcript:
+
+- `v1/grade.md` · `v1/result.txt` — first round (baseline)
+- `v2/grade.md` · `v2/result.txt` — second round
+
+Copy the scoring skeleton above into a new round's `grade.md` to add one.