Roflin/rebbarb
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

schematic: eFuse OVLO ladder + ILIM fix (V2.1)

Browse Source 
Implements the values worked out in 6ce7657.

  R45  100k -> 33k    ILIM 0.52 A -> 1.52 A (clears the 621 mA inrush)
  R46  620k -> 150k   ladder R1: 12V_RAW -> EN/UVLO
  R47  100k -> 10k    ladder R2: EN/UVLO -> OVLO
  R48  NEW    12k  \  ladder R3 = 14.2k: OVLO -> GND
  R49  NEW    2.2k /
  U13 pin 2 (OVLO) taken off GND and onto the new EFUSE_OVLO net

Verified: netlist shows 12V_RAW(R46.1) / EFUSE_EN(R46.2,R47.1,U13.5) /
EFUSE_OVLO(R47.2,R48.1,U13.2) / EFUSE_R3MID(R48.2,R49.1) / GND(R49.2,R45.2,
U13.4); 150 -> 152 components with none dropped (the malformed-property trap
from the kicad-bom-edit skill); ERC 0 violations.

PCB placement and routing still to do.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
This commit is contained in:
Dennis Brentjes
2026-10-02 08:52:34 +00:00
parent 6ce7657f05
commit 228ff03cb6
2 changed files with 396 additions and 167 deletions
Download Patch File Download Diff File Expand all files Collapse all files
hardware/re-bba-rb/TODO.md
+9 -3
View File
@@ -246,15 +246,21 @@ schematic changes.
the TPS25961 selects the internal *fixed* overvoltage cutoff ~5.98 V — so a
12 V rail is permanently in overvoltage lockout and the eFuse passes
nothing (bench-confirmed: 12V_EXI=0, GC_ON=0, W5100 unpowered).
**FIX WORKED OUT FROM THE DATASHEET 2026-10-02 — values final, needs
schematic + PCB work.** TI 3-resistor ladder (§8.2.3.2), EN/UVLO tapped at
**SCHEMATIC DONE 2026-10-02 (netlist + ERC verified) — PCB PLACEMENT
AND ROUTING STILL TO DO.** TI 3-resistor ladder (§8.2.3.2), EN/UVLO tapped at
R1–R2 and OVLO at R2–R3, plus an ILIM correction:
R46 620 k -> **150 k** (C93947) R1, top: 12V_RAW -> EN/UVLO
R47 100 k -> **10 k** (C25744) R2: EN/UVLO -> OVLO
R48 NEW -> **12 k** (C25752) \ R3 = 14.2 k in series,
R49 NEW -> **2.2 k** (C25879) / OVLO -> GND
R45 100 k -> **33 k** (C25779) ILIM 0.52 A -> 1.52 A
U13 pin 2 (OVLO): disconnect from GND, wire to the R47/R48 junction.
U13 pin 2 (OVLO): disconnected from GND, now on net EFUSE_OVLO.
Verified after the edit: nets are 12V_RAW(R46.1) / EFUSE_EN(R46.2, R47.1,
U13.5) / EFUSE_OVLO(R47.2, R48.1, U13.2) / EFUSE_R3MID(R48.2, R49.1) /
GND(R49.2, R45.2, U13.4); component count 150 -> 152 with nothing
dropped; ERC 0 violations. **PCB TODO:** place R48/R49 near U13, route
the new EFUSE_OVLO and EFUSE_R3MID nets, and re-export BOM + CPL
(reapplying CPL_ROTATIONS.md afterwards).
Gives UVLO 8.93 V typ (unchanged from today) and OVLO 15.21 V typ,
15.81 V worst case — under U3's 17 V input rating, which is what actually
caps the OVLO target. ILIM must exceed the board's own 621 mA inrush;
hardware/re-bba-rb/exi.kicad_sch
+387 -164
View File
@@ -2182,7 +2182,7 @@
(justify left)
)
)
(property "Value" "100k"
(property "Value" "33k"
(at 142.24 58.42 0)
(show_name no)
(do_not_autoplace no)
@@ -2226,7 +2226,7 @@
)
)
)
(property "MPN" "0402WGF1003TCE"
(property "MPN" "0402WGF3302TCE"
(at 139.7 58.42 0)
(hide yes)
(show_name no)
@@ -2248,7 +2248,7 @@
)
)
)
(property "LCSC" "C25741"
(property "LCSC" "C25779"
(at 139.7 58.42 0)
(hide yes)
(show_name no)
@@ -2902,83 +2902,6 @@
)
)
)
(symbol
(lib_id "power:GND")
(at 109.22 53.34 0)
(unit 1)
(body_style 1)
(exclude_from_sim no)
(in_bom yes)
(on_board yes)
(in_pos_files yes)
(dnp no)
(uuid "2c93259d-50ac-44b6-9397-ffe9a4b3bf06")
(property "Reference" "#PWR017"
(at 109.22 57.15 0)
(hide yes)
(show_name no)
(do_not_autoplace no)
(effects
(font
(size 1.27 1.27)
)
)
)
(property "Value" "GND"
(at 109.22 55.626 0)
(show_name no)
(do_not_autoplace no)
(effects
(font
(size 1.27 1.27)
)
)
)
(property "Footprint" ""
(at 109.22 53.34 0)
(hide yes)
(show_name no)
(do_not_autoplace no)
(effects
(font
(size 1.27 1.27)
)
)
)
(property "Datasheet" ""
(at 109.22 53.34 0)
(hide yes)
(show_name no)
(do_not_autoplace no)
(effects
(font
(size 1.27 1.27)
)
)
)
(property "Description" "Power symbol creates a global label with name \"GND\" , ground"
(at 109.22 53.34 0)
(hide yes)
(show_name no)
(do_not_autoplace no)
(effects
(font
(size 1.27 1.27)
)
)
)
(pin "1"
(uuid "5eda44f2-f22c-4a04-9a9c-8cf70f7b115e")
)
(instances
(project "re-bba-rb"
(path "/dbb182a6-d579-468e-b98b-6f0950da9e3a/1b071f68-b4ea-469c-942f-de06380c9077"
(reference "#PWR017")
(unit 1)
)
)
)
)
(symbol
(lib_id "Device:C")
(at 91.44 44.45 0)
@@ -3814,7 +3737,7 @@
(justify left)
)
)
(property "Value" "100k"
(property "Value" "10k"
(at 102.87 54.61 0)
(show_name no)
(do_not_autoplace no)
@@ -3858,7 +3781,7 @@
)
)
)
(property "MPN" "0402WGF1003TCE"
(property "MPN" "0402WGF1002TCE"
(at 100.33 54.61 0)
(hide yes)
(show_name no)
@@ -3880,7 +3803,7 @@
)
)
)
(property "LCSC" "C25741"
(property "LCSC" "C25744"
(at 100.33 54.61 0)
(hide yes)
(show_name no)
@@ -3891,7 +3814,7 @@
)
)
)
(property "Tolerance" "1%"
(property "Tolerance" "5%"
(at 100.33 54.61 0)
(hide yes)
(show_name no)
@@ -3917,83 +3840,6 @@
)
)
)
(symbol
(lib_id "power:GND")
(at 100.33 58.42 0)
(unit 1)
(body_style 1)
(exclude_from_sim no)
(in_bom yes)
(on_board yes)
(in_pos_files yes)
(dnp no)
(uuid "af4aa082-a85b-49fc-b01d-ec1f4d861d22")
(property "Reference" "#PWR051"
(at 100.33 62.23 0)
(hide yes)
(show_name no)
(do_not_autoplace no)
(effects
(font
(size 1.27 1.27)
)
)
)
(property "Value" "GND"
(at 100.33 60.706 0)
(show_name no)
(do_not_autoplace no)
(effects
(font
(size 1.27 1.27)
)
)
)
(property "Footprint" ""
(at 100.33 58.42 0)
(hide yes)
(show_name no)
(do_not_autoplace no)
(effects
(font
(size 1.27 1.27)
)
)
)
(property "Datasheet" ""
(at 100.33 58.42 0)
(hide yes)
(show_name no)
(do_not_autoplace no)
(effects
(font
(size 1.27 1.27)
)
)
)
(property "Description" "Power symbol creates a global label with name \"GND\" , ground"
(at 100.33 58.42 0)
(hide yes)
(show_name no)
(do_not_autoplace no)
(effects
(font
(size 1.27 1.27)
)
)
)
(pin "1"
(uuid "34503ebf-ec7e-4d2d-b03a-ea208b805468")
)
(instances
(project "re-bba-rb"
(path "/dbb182a6-d579-468e-b98b-6f0950da9e3a/1b071f68-b4ea-469c-942f-de06380c9077"
(reference "#PWR051")
(unit 1)
)
)
)
)
(symbol
(lib_id "power:GND")
(at 91.44 48.26 0)
@@ -4168,7 +4014,7 @@
(justify left)
)
)
(property "Value" "620k"
(property "Value" "150k"
(at 102.87 44.45 0)
(show_name no)
(do_not_autoplace no)
@@ -4212,7 +4058,7 @@
)
)
)
(property "MPN" "RC0402FR-07620KL"
(property "MPN" "RC0402FR-07150KL"
(at 100.33 44.45 0)
(hide yes)
(show_name no)
@@ -4234,7 +4080,7 @@
)
)
)
(property "LCSC" "C137952"
(property "LCSC" "C93947"
(at 100.33 44.45 0)
(hide yes)
(show_name no)
@@ -4642,6 +4488,383 @@
)
)
)
(label "EFUSE_OVLO"
(at 109.22 53.34 0)
(effects
(font
(size 1.27 1.27)
)
(justify left bottom)
)
(uuid "c98beb59-c540-4446-afa1-e8efd402373d")
)
(label "EFUSE_OVLO"
(at 100.33 58.42 0)
(effects
(font
(size 1.27 1.27)
)
(justify left bottom)
)
(uuid "9083df2c-23b3-47c8-b992-6128bb58f6d1")
)
(symbol
(lib_id "Device:R")
(at 100.33 66.04 0)
(unit 1)
(body_style 1)
(exclude_from_sim no)
(in_bom yes)
(on_board yes)
(in_pos_files yes)
(dnp no)
(uuid "ecf1573b-3b47-4fef-a2f4-2c05176a8cae")
(property "Reference" "R48"
(at 102.87 63.5 0)
(show_name no)
(do_not_autoplace no)
(effects
(font
(size 1.27 1.27)
)
(justify left)
)
)
(property "Value" "12k"
(at 102.87 66.04 0)
(show_name no)
(do_not_autoplace no)
(effects
(font
(size 1.27 1.27)
)
(justify left)
)
)
(property "Footprint" "Resistor_SMD:R_0402_1005Metric_Pad0.72x0.64mm_HandSolder"
(at 100.33 66.04 0)
(hide yes)
(show_name no)
(do_not_autoplace no)
(effects
(font
(size 1.27 1.27)
)
)
)
(property "Datasheet" ""
(at 100.33 66.04 0)
(hide yes)
(show_name no)
(do_not_autoplace no)
(effects
(font
(size 1.27 1.27)
)
)
)
(property "Description" ""
(at 100.33 66.04 0)
(hide yes)
(show_name no)
(do_not_autoplace no)
(effects
(font
(size 1.27 1.27)
)
)
)
(property "MPN" "0402WGF1202TCE"
(at 100.33 66.04 0)
(hide yes)
(show_name no)
(do_not_autoplace no)
(effects
(font
(size 1.27 1.27)
)
)
)
(property "Manufacturer" "UNI-ROYAL"
(at 100.33 66.04 0)
(hide yes)
(show_name no)
(do_not_autoplace no)
(effects
(font
(size 1.27 1.27)
)
)
)
(property "LCSC" "C25752"
(at 100.33 66.04 0)
(hide yes)
(show_name no)
(do_not_autoplace no)
(effects
(font
(size 1.27 1.27)
)
)
)
(property "Tolerance" "1%"
(at 100.33 66.04 0)
(hide yes)
(show_name no)
(do_not_autoplace no)
(effects
(font
(size 1.27 1.27)
)
)
)
(pin "1"
(uuid "b2518561-8e15-43c1-9c63-75ca9b526acc")
)
(pin "2"
(uuid "418fa72b-c982-4837-a130-fb0be84adb62")
)
(instances
(project "re-bba-rb"
(path "/dbb182a6-d579-468e-b98b-6f0950da9e3a/1b071f68-b4ea-469c-942f-de06380c9077"
(reference "R48")
(unit 1)
)
)
)
)
(label "EFUSE_OVLO"
(at 100.33 62.23 0)
(effects
(font
(size 1.27 1.27)
)
(justify left bottom)
)
(uuid "bde2b3a7-a722-4200-a0ee-ee55a2f62b0c")
)
(label "EFUSE_R3MID"
(at 100.33 69.85 0)
(effects
(font
(size 1.27 1.27)
)
(justify left bottom)
)
(uuid "8a1b1878-4bbb-4263-bb27-0ae5a0eaed2a")
)
(symbol
(lib_id "Device:R")
(at 100.33 77.47 0)
(unit 1)
(body_style 1)
(exclude_from_sim no)
(in_bom yes)
(on_board yes)
(in_pos_files yes)
(dnp no)
(uuid "b565f4c8-0a88-43fb-a377-1ff8dd19f14c")
(property "Reference" "R49"
(at 102.87 74.93 0)
(show_name no)
(do_not_autoplace no)
(effects
(font
(size 1.27 1.27)
)
(justify left)
)
)
(property "Value" "2.2k"
(at 102.87 77.47 0)
(show_name no)
(do_not_autoplace no)
(effects
(font
(size 1.27 1.27)
)
(justify left)
)
)
(property "Footprint" "Resistor_SMD:R_0402_1005Metric_Pad0.72x0.64mm_HandSolder"
(at 100.33 77.47 0)
(hide yes)
(show_name no)
(do_not_autoplace no)
(effects
(font
(size 1.27 1.27)
)
)
)
(property "Datasheet" ""
(at 100.33 77.47 0)
(hide yes)
(show_name no)
(do_not_autoplace no)
(effects
(font
(size 1.27 1.27)
)
)
)
(property "Description" ""
(at 100.33 77.47 0)
(hide yes)
(show_name no)
(do_not_autoplace no)
(effects
(font
(size 1.27 1.27)
)
)
)
(property "MPN" "0402WGF2201TCE"
(at 100.33 77.47 0)
(hide yes)
(show_name no)
(do_not_autoplace no)
(effects
(font
(size 1.27 1.27)
)
)
)
(property "Manufacturer" "UNI-ROYAL"
(at 100.33 77.47 0)
(hide yes)
(show_name no)
(do_not_autoplace no)
(effects
(font
(size 1.27 1.27)
)
)
)
(property "LCSC" "C25879"
(at 100.33 77.47 0)
(hide yes)
(show_name no)
(do_not_autoplace no)
(effects
(font
(size 1.27 1.27)
)
)
)
(property "Tolerance" "1%"
(at 100.33 77.47 0)
(hide yes)
(show_name no)
(do_not_autoplace no)
(effects
(font
(size 1.27 1.27)
)
)
)
(pin "1"
(uuid "8ba70a49-9b0f-477c-9f71-55f7cc767e04")
)
(pin "2"
(uuid "fa929019-1559-416e-b74b-de6bcab1f44f")
)
(instances
(project "re-bba-rb"
(path "/dbb182a6-d579-468e-b98b-6f0950da9e3a/1b071f68-b4ea-469c-942f-de06380c9077"
(reference "R49")
(unit 1)
)
)
)
)
(label "EFUSE_R3MID"
(at 100.33 73.66 0)
(effects
(font
(size 1.27 1.27)
)
(justify left bottom)
)
(uuid "ac30cf09-f00b-4185-b9f5-cccd27029fdf")
)
(symbol
(lib_id "power:GND")
(at 100.33 81.28 0)
(unit 1)
(body_style 1)
(exclude_from_sim no)
(in_bom yes)
(on_board yes)
(in_pos_files yes)
(dnp no)
(uuid "e479f676-fff9-45ae-ab79-d5f1d01a3858")
(property "Reference" "#PWR053"
(at 100.33 85.09 0)
(hide yes)
(show_name no)
(do_not_autoplace no)
(effects
(font
(size 1.27 1.27)
)
)
)
(property "Value" "GND"
(at 100.33 83.566 0)
(show_name no)
(do_not_autoplace no)
(effects
(font
(size 1.27 1.27)
)
)
)
(property "Footprint" ""
(at 100.33 81.28 0)
(hide yes)
(show_name no)
(do_not_autoplace no)
(effects
(font
(size 1.27 1.27)
)
)
)
(property "Datasheet" ""
(at 100.33 81.28 0)
(hide yes)
(show_name no)
(do_not_autoplace no)
(effects
(font
(size 1.27 1.27)
)
)
)
(property "Description" "Power symbol creates a global label with name \"GND\" , ground"
(at 100.33 81.28 0)
(hide yes)
(show_name no)
(do_not_autoplace no)
(effects
(font
(size 1.27 1.27)
)
)
)
(pin "1"
(uuid "50bf210b-1ef2-49f1-8388-ba160e6d8d99")
)
(instances
(project "re-bba-rb"
(path "/dbb182a6-d579-468e-b98b-6f0950da9e3a/1b071f68-b4ea-469c-942f-de06380c9077"
(reference "#PWR053")
(unit 1)
)
)
)
)
(sheet_instances
(path "/"
(page "6")