Merge branch 'main' of https://gitea.iten.pro/edi/small_hw

SY8129IABC_3V3_Converter/Readme.md

@@ -0,0 +1,65 @@
+# Auslegung: 12V auf 3.3V Step-Down mit SY8120IABC
+
+Dieses Dokument beschreibt das Design eines hocheffizienten, synchronen DC/DC-Abwärtswandlers. Es ist eine moderne Alternative zu älteren Designs wie dem TPS5430.
+
+## 1. Design-Ziele
+
+* **Eingangsspannung ($V_{in}$):** 12V (Bereich 10.5V - 14V)
+* **Ausgangsspannung ($V_{out}$):** 3.3V
+* **Ausgangsstrom ($I_{out}$):** Ausgelegt für ca. 0.5A, mit Reserven bis 2A.
+* **Kernbaustein:** Silergy SY8120IABC (Synchron, 1MHz, bis 18V, 2A)
+* **Ziele:** Hohe Effizienz, kompaktes Layout, minimale Anzahl externer Bauteile (keine externe Diode).
+
+## 2. Auslegung der Bauteile
+
+Die Berechnung der externen Komponenten basiert auf dem Datenblatt des SY8120IABC.
+
+### a) Feedback-Widerstände (R1, R2)
+
+Der SY8120IABC hat eine Referenzspannung ($V_{FB}$) von **0.6V**. Die Formel zur Einstellung der Ausgangsspannung lautet:
+$V_{out} = V_{FB} \times (1 + \frac{R1}{R2})$
+
+Um eine stabile Schleife zu gewährleisten, wird für R2 ein Wert zwischen 10kΩ und 100kΩ empfohlen.
+
+* Wir wählen: **`R2 = 49.9 kΩ`** (1%, E96-Reihe)
+* Daraus berechnet sich R1:
+    $R1 = R2 \times (\frac{V_{out}}{V_{FB}} - 1) = 49.9kΩ \times (\frac{3.3V}{0.6V} - 1) = 49.9kΩ \times 4.5 = 224.55kΩ$
+* Der nächstgelegene Standardwert ist: **`R1 = 226 kΩ`** (1%, E96-Reihe)
+
+Die resultierende Ausgangsspannung beträgt damit $V_{out} = 0.6V \times (1 + \frac{226k}{49.9k}) \approx 3.317V$, was eine exzellente Annäherung an 3.3V ist.
+
+### b) Induktivität (L1)
+
+Durch die hohe Schaltfrequenz von 1 MHz kann eine physisch kleine Spule mit geringerer Induktivität verwendet werden. Das Datenblatt empfiehlt Werte im Bereich von 2.2µH bis 10µH.
+
+* Wir wählen einen Wert von **`L1 = 4.7 µH`**.
+* **Wichtig:** Der Sättigungsstrom ($I_{sat}$) muss über der Strombegrenzung des ICs liegen (ca. 3A). Eine Spule mit **$I_{sat} > 3A$** wird gewählt.
+
+### c) Kondensatoren (C1, C2, C3)
+
+* **Eingangskondensator (C1):** Ein **`10µF / 25V`** Keramikkondensator (0805) ist ausreichend, um die Eingangsspannung zu stabilisieren.
+* **Ausgangskondensator (C2):** Ein **`22µF / 10V`** Keramikkondensator (0805) wird für eine stabile Ausgangsspannung mit geringem Ripple empfohlen.
+* **Bootstrap-Kondensator (C3):** Wie im Datenblatt spezifiziert, wird ein **`100nF`** Kondensator zwischen die Pins BOOT und SW geschaltet.
+
+## 3. Finale Stückliste (BOM) für LCSC/JLCPCB
+
+Diese Liste wurde auf Verfügbarkeit geprüft (Stand: 24. Juni 2025).
+
+| Bauteil (Ref) | Wert | LCSC Part # | Gehäuse | JLCPCB Status | Hinweis |
+| :--- | :--- | :--- | :--- | :--- | :--- |
+| **IC1** | **SY8120IABC**| `C479076` | SOT23-6 | Extended Part | Synchroner Step-Down Regler. |
+| **L1** | **4.7 µH** | `C320925` | 6.3x6.3mm | Extended Part | Chilisin BPCI0603F-4R7M-P2. Isat=3.1A, DCR=45mΩ. |
+| **C1 (Eingang)**| **10 µF, 25V** | `C1585` | 0805 | Basic Part | Samsung CL21A106KQFNNNE. So nah wie möglich an VIN/GND des ICs. |
+| **C2 (Ausgang)**| **22 µF, 10V** | `C15951` | 0805 | Basic Part | Samsung CL21A226MQCLRNC. Nah am Ausgang der Spule platzieren. |
+| **C3 (Bootstrap)**| **100 nF, 50V** | `C1508` | 0402 | Basic Part | Yageo CC0402KRX7R9BB104. Direkt zwischen BOOT und SW Pins. |
+| **R1** | **226 kΩ, 1%**| `C25995` | 0402 | Basic Part | UNI-ROYAL 0402WGF2263TCE. Feedback-Widerstand (oben). |
+| **R2** | **49.9 kΩ, 1%**| `C25900` | 0402 | Basic Part | UNI-ROYAL 0402WGF4992TCE. Feedback-Widerstand (unten). |
+
+## 4. Wichtige Hinweise zum Layout
+
+Für einen hochfrequenten Wandler (1MHz) ist ein gutes Layout noch wichtiger als sonst.
+
+1.  **Kritischer Loop (Eingang):** Der Pfad vom Eingangskondensator `C1` zum `VIN`-Pin des ICs und vom `GND`-Pin des ICs zurück zu `C1` muss absolut minimal sein. Kurze, breite Leiterbahnen sind hier Pflicht.
+2.  **SW (Schaltknoten):** Der Pin `SW` (Switch) führt die hochfrequent geschaltete Spannung. Die Leiterbahn von diesem Pin zur Spule `L1` sollte kurz und breit sein, aber von empfindlichen Signalen (wie der Feedback-Leitung) ferngehalten werden.
+3.  **Feedback-Pfad:** Die Widerstände `R1` und `R2` sollten nah am `FB`-Pin des ICs platziert werden. Die Leiterbahn vom `FB`-Pin zum Widerstandsteiler sollte kurz sein und nicht parallel zu lauten Leiterbahnen (wie SW) geführt werden.
+4.  **Masseführung:** Eine durchgehende Massefläche unter den Komponenten ist die beste Lösung, um die Rückströme kurz zu halten und die thermische Anbindung zu verbessern.

SY8129IABC_3V3_Converter/SY8129IABC_3V3_Converter.kicad_pcb

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SY8129IABC_3V3_Converter/SY8129IABC_3V3_Converter.kicad_pro

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SY8129IABC_3V3_Converter/SY8129IABC_3V3_Converter.kicad_sch

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TPS5430DDAR_3V3_0A5_Converter/TPS5430DDAR_3V3_0A5_Converter.kicad_prl

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TPS5430DDAR_3V3_0A5_Converter/TPS5430DDAR_3V3_0A5_Converter.kicad_pro

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+      "no_connect_connected": "warning",
+      "no_connect_dangling": "warning",
+      "pin_not_connected": "error",
+      "pin_not_driven": "error",
+      "pin_to_pin": "warning",
+      "power_pin_not_driven": "error",
+      "same_local_global_label": "warning",
+      "similar_label_and_power": "warning",
+      "similar_labels": "warning",
+      "similar_power": "warning",
+      "simulation_model_issue": "ignore",
+      "single_global_label": "ignore",
+      "unannotated": "error",
+      "unconnected_wire_endpoint": "warning",
+      "unit_value_mismatch": "error",
+      "unresolved_variable": "error",
+      "wire_dangling": "error"
+    }
+  },
   "libraries": {
     "pinned_footprint_libs": [],
     "pinned_symbol_libs": []
   },
   "meta": {
-    "filename": "kicad.kicad_pro",
+    "filename": "TPS5430DDAR_3V3_0A5_Converter.kicad_pro",
-    "version": 1
+    "version": 3
   },
   "net_settings": {
-    "classes": [],
+    "classes": [
+      {
+        "bus_width": 12,
+        "clearance": 0.2,
+        "diff_pair_gap": 0.25,
+        "diff_pair_via_gap": 0.25,
+        "diff_pair_width": 0.2,
+        "line_style": 0,
+        "microvia_diameter": 0.3,
+        "microvia_drill": 0.1,
+        "name": "Default",
+        "pcb_color": "rgba(0, 0, 0, 0.000)",
+        "priority": 2147483647,
+        "schematic_color": "rgba(0, 0, 0, 0.000)",
+        "track_width": 0.2,
+        "via_diameter": 0.6,
+        "via_drill": 0.3,
+        "wire_width": 6
+      },
+      {
+        "clearance": 0.2,
+        "name": "Power",
+        "pcb_color": "rgba(0, 0, 0, 0.000)",
+        "priority": 0,
+        "schematic_color": "rgba(0, 0, 0, 0.000)",
+        "track_width": 1.0,
+        "via_diameter": 1.0,
+        "via_drill": 0.75
+      }
+    ],
     "meta": {
-      "version": 0
+      "version": 4
-    }
+    },
+    "net_colors": null,
+    "netclass_assignments": null,
+    "netclass_patterns": [
+      {
+        "netclass": "Power",
+        "pattern": "/V*"
+      }
+    ]
   },
   "pcbnew": {
+    "last_paths": {
+      "gencad": "",
+      "idf": "",
+      "netlist": "",
+      "plot": "",
+      "pos_files": "",
+      "specctra_dsn": "",
+      "step": "",
+      "svg": "",
+      "vrml": ""
+    },
     "page_layout_descr_file": ""
   },
-  "sheets": [],
+  "schematic": {
+    "annotate_start_num": 0,
+    "bom_export_filename": "${PROJECTNAME}.csv",
+    "bom_fmt_presets": [],
+    "bom_fmt_settings": {
+      "field_delimiter": ",",
+      "keep_line_breaks": false,
+      "keep_tabs": false,
+      "name": "CSV",
+      "ref_delimiter": ",",
+      "ref_range_delimiter": "",
+      "string_delimiter": "\""
+    },
+    "bom_presets": [],
+    "bom_settings": {
+      "exclude_dnp": false,
+      "fields_ordered": [
+        {
+          "group_by": false,
+          "label": "Reference",
+          "name": "Reference",
+          "show": true
+        },
+        {
+          "group_by": false,
+          "label": "Qty",
+          "name": "${QUANTITY}",
+          "show": true
+        },
+        {
+          "group_by": true,
+          "label": "Value",
+          "name": "Value",
+          "show": true
+        },
+        {
+          "group_by": true,
+          "label": "DNP",
+          "name": "${DNP}",
+          "show": true
+        },
+        {
+          "group_by": false,
+          "label": "LCSC PN",
+          "name": "LCSC PN",
+          "show": true
+        },
+        {
+          "group_by": true,
+          "label": "Exclude from BOM",
+          "name": "${EXCLUDE_FROM_BOM}",
+          "show": true
+        },
+        {
+          "group_by": true,
+          "label": "Exclude from Board",
+          "name": "${EXCLUDE_FROM_BOARD}",
+          "show": true
+        },
+        {
+          "group_by": true,
+          "label": "Footprint",
+          "name": "Footprint",
+          "show": true
+        },
+        {
+          "group_by": false,
+          "label": "Datasheet",
+          "name": "Datasheet",
+          "show": true
+        },
+        {
+          "group_by": false,
+          "label": "Beschreibung",
+          "name": "Description",
+          "show": false
+        },
+        {
+          "group_by": false,
+          "label": "#",
+          "name": "${ITEM_NUMBER}",
+          "show": false
+        }
+      ],
+      "filter_string": "",
+      "group_symbols": true,
+      "include_excluded_from_bom": true,
+      "name": "",
+      "sort_asc": true,
+      "sort_field": "Reference"
+    },
+    "connection_grid_size": 50.0,
+    "drawing": {
+      "dashed_lines_dash_length_ratio": 12.0,
+      "dashed_lines_gap_length_ratio": 3.0,
+      "default_line_thickness": 6.0,
+      "default_text_size": 50.0,
+      "field_names": [],
+      "intersheets_ref_own_page": false,
+      "intersheets_ref_prefix": "",
+      "intersheets_ref_short": false,
+      "intersheets_ref_show": false,
+      "intersheets_ref_suffix": "",
+      "junction_size_choice": 3,
+      "label_size_ratio": 0.375,
+      "operating_point_overlay_i_precision": 3,
+      "operating_point_overlay_i_range": "~A",
+      "operating_point_overlay_v_precision": 3,
+      "operating_point_overlay_v_range": "~V",
+      "overbar_offset_ratio": 1.23,
+      "pin_symbol_size": 25.0,
+      "text_offset_ratio": 0.15
+    },
+    "legacy_lib_dir": "",
+    "legacy_lib_list": [],
+    "meta": {
+      "version": 1
+    },
+    "net_format_name": "",
+    "page_layout_descr_file": "",
+    "plot_directory": "",
+    "space_save_all_events": true,
+    "spice_current_sheet_as_root": false,
+    "spice_external_command": "spice \"%I\"",
+    "spice_model_current_sheet_as_root": true,
+    "spice_save_all_currents": false,
+    "spice_save_all_dissipations": false,
+    "spice_save_all_voltages": false,
+    "subpart_first_id": 65,
+    "subpart_id_separator": 0
+  },
+  "sheets": [
+    [
+      "6d1e4ef9-7207-43df-b031-faa1803bd859",
+      "Root"
+    ]
+  ],
   "text_variables": {}
 }

TPS5430DDAR_3V3_0A5_Converter/fabrication-toolkit-options.json

@@ -0,0 +1 @@
+{"ARCHIVE_NAME": "", "EXTRA_LAYERS": "", "ALL_ACTIVE_LAYERS": false, "EXTEND_EDGE_CUT": false, "ALTERNATIVE_EDGE_CUT": false, "AUTO TRANSLATE": true, "AUTO FILL": true, "EXCLUDE DNP": false}