metronome/hardware/kicad/power_tree.erc at cd619cfeb29f744c7c863c23d102779da66937ea - VARASYS/metronome - Forgejo: Beyond coding. We forge.

VARASYS/metronome

Me Here cd619cfeb2 PM_K-1 hardware: power tree (USB 5V -> +/-18V switcher -> clean +/-15V LDOs + 3V3)

circuits/power_tree.py captures the full supply, topology + values verified from the
TPS65131 datasheet (SLVS493E: pinout p3, Typical Application Fig 8-1 p11, BOM Table 8-2
p12, FB equations p13 Vref=1.213V) and the TPS7A49/TPS7A30 LDO datasheets:
- TPS65131 dual boost/inverter: L1/L2=4.7uH, D1/D2=MBRM120, FB dividers set ~+/-18.2V
  (R1=1.4M/R2=100k, R3=1.5M/R4=100k), comp C7/C6 on CP/CN, VREF 220nF, no Q1 (USB),
  PSP/PSN=GND forced-PWM for low audio-band noise.
- TPS7A4901/TPS7A3001 post-regulate to clean +/-15V (shared 8-pin pinout, EN tied to IN).
- AP2112K-3.3 -> digital 3V3.
ERC 0 errors; netlist 0 errors.

CONFIRM before fab: exact LDO Vfb (used ~1.194V/-1.18V for the dividers) and the
AP2112K SOT-23-5 pinout. Switcher validated vs TI reference design; no SPICE (behavioral
models don't validate a switcher) -- layout per the TI EVM.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

2026-05-30 20:53:44 -05:00

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Raw Blame History

 ERC WARNING: Only one pin (PASSIVE pin 1/1 of L/L3) attached to net VBUS_5V.
 ERC WARNING: Unconnected pin: OUTPUT pin 7/BSW of TPS65131/U7.
 ERC INFO: 2 warnings found while running ERC.
 ERC INFO: 0 errors found while running ERC.