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E-009 — BLOCKING: REQ-002 (1.5A/ch @ 24V) not demonstrated — R17/R49 rework pending notice

Created by demo · 2026-05-27

History

Details

Root cause confirmed (2026-05-23): CTRL ceiling with R17/R49=100kΩ limits peak inductor current to 1.65A. At VIN=20V, VOUT=24V, IOUT=1.5A, required peak IL=1.97A — analytically insufficient. Practical IOUT max ≈1.37A, consistent with E04 soak data (droop observed at 1.28A, VMON CH1=23.47V, below ±2% limit).

Fix — hardware rework: R17/R49 100kΩ → 75kΩ (raises VCTRL ceiling to 1.362V, peak IL=2.0A). Firmware ISET cap must also be raised from 4.56V → 5.0V.

Prerequisite: Physically verify DUT-01 R17/R49 value before rework. Physical value uncertain (may still be 91kΩ from Rework #3 diagnostic; Rework #4 revert not physically confirmed).

Do NOT report REQ-002 as met until TC-P-00 and TC-P-01 formal tests pass after rework implementation.

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