TX6128

{
  "schema_version": 1,
  "type": "component",
  "slug": "tx6128",
  "title": "TX6128",
  "brief": "XDS LED Drivers, ESOP-8. Pinout extracted from the datasheet, KiCad symbol/footprint/3D.",
  "version": "0.2.0",
  "license": "CC-BY-SA-4.0",
  "tags": [
    "component",
    "led-drv",
    "tx6128"
  ],
  "component": {
    "mpn": "TX6128",
    "manufacturer": "XDS",
    "package": "ESOP-8",
    "pin_count": 9,
    "category": "LED-drv",
    "subcategory": "LED Drivers",
    "datasheet": "https://wmsc.lcsc.com/wmsc/upload/file/pdf/v2/lcsc/2303031800_XDS-TX6128_C448625.pdf",
    "parts": {
      "symbol": "tx6128.kicad_sym",
      "footprint": "tx6128.kicad_mod",
      "model_3d": "tx6128-etched.glb",
      "model_3d_plain": "tx6128.glb",
      "model_3d_step": "tx6128-etched.step",
      "model_3d_step_plain": "tx6128.step",
      "lbr": "tx6128.lbr"
    },
    "distributor_links": {
      "lcsc": "C448625"
    },
    "pins": [
      {
        "number": "1",
        "name": "GND",
        "type": "power_in",
        "description": "Device ground reference. Connect to the system ground plane; the current-sense resistor RCS return should route with short/wide traces to GND to preserve current-regulation accuracy."
      },
      {
        "number": "2",
        "name": "NC",
        "type": "unconnected",
        "description": "No connection. Leave floating (per datasheet '悬空')."
      },
      {
        "number": "3",
        "name": "DIM",
        "type": "input",
        "description": "Dimming control input. Supports PWM dimming and linear dimming (linear range 1.1-3.1V, ≥3.1V = 100% output, ≤0.9V = LED off). Must not be left floating; tie high when dimming is unused, and add ≥10nF to GND for linear dimming."
      },
      {
        "number": "4",
        "name": "SW",
        "type": "power_out",
        "description": "Switch node; internally connected to the drain of the integrated 100V power MOSFET (RDS(on) ≈ 210mΩ at VGS=5V). Connects to the buck inductor / freewheel diode cathode in the standard step-down LED topology."
      },
      {
        "number": "5",
        "name": "CS",
        "type": "input",
        "description": "Inductor peak current sense input. Tied internally in parallel with pin 6; connect to the top of the external current-sense resistor RCS. Peak threshold VCS_TH ≈ 255mV (245-265mV)."
      },
      {
        "number": "6",
        "name": "CS",
        "type": "input",
        "description": "Inductor peak current sense input (paralleled with pin 5). Connect to the same node at the top of RCS with short/wide traces to minimize parasitic resistance error."
      },
      {
        "number": "7",
        "name": "TOFF",
        "type": "input",
        "description": "Off-time programming pin. Fixed off-time is set by an external capacitor COFF per TOFF = 0.51 × 150kΩ × (COFF + 7.3pF) + TD (TD = 61ns). If left open, the internal minimum off-time defaults to ~650ns."
      },
      {
        "number": "8",
        "name": "VDD",
        "type": "power_in",
        "description": "Chip supply. Internally clamped by a shunt regulator to ~5.5V (max clamp current 10mA). Fed from VIN through an external dropping resistor RVDD sized for the operating current (typ. 1.5mA at 200kHz)."
      },
      {
        "number": "9",
        "name": "EP",
        "type": "power_out",
        "description": "Exposed thermal pad on the ESOP-8 underside. Internally connected to SW (MOSFET drain). Solder to a copper area electrically tied to the SW node for heat dissipation - do NOT connect to GND."
      }
    ],
    "provenance": {
      "extractor": "ds2sf",
      "datasheet": {
        "url": "https://wmsc.lcsc.com/wmsc/upload/file/pdf/v2/lcsc/2303031800_XDS-TX6128_C448625.pdf",
        "pages": 7,
        "sha256": "445f3da27fe5f2f2",
        "source_tier": "lcsc"
      },
      "cad": "KiCad official (CC-BY-SA 4.0)",
      "pins": {
        "total": 9,
        "described": 9,
        "cites_pages": true,
        "refuses_to_fabricate": true
      }
    },
    "viewers": {
      "symbol": "viewers/symbol.html",
      "footprint": "viewers/footprint.html"
    },
    "pin1": {
      "pad": "1",
      "at": [
        -2.475,
        -1.905
      ],
      "corner": "top-left",
      "source": "silk-marker",
      "derived_from": "SOIC-8-1EP_3.9x4.9mm_P1.27mm_EP2.41x3.3mm@sha256:5848244c5e72002e",
      "mark": "drawn"
    },
    "models_3d": [
      {
        "file": "tx6128.step",
        "role": "plain",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
          6.9,
          4.9,
          1.65
        ],
        "zmin_mm": 0,
        "centre_offset_mm": 0,
        "footprint_binding": "identity",
        "sha256": "f1718a42c5ea007e8e2dd672ac39a1bb358ee4849bd53c42e21ce83e0e5df7a9",
        "checked": "2026-10-07",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      },
      {
        "file": "tx6128-etched.step",
        "role": "eda",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
          6.9,
          4.9,
          1.65
        ],
        "zmin_mm": 0,
        "centre_offset_mm": 0,
        "footprint_binding": "identity",
        "sha256": "95eb411c2275a42e14a4f4db7919af991f10a275bf780c8e047d240146f34e5e",
        "checked": "2026-10-07",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      }
    ]
  },
  "metadata": {
    "specs": {
      "Manufacturer": "XDS",
      "Package": "ESOP-8",
      "Category": "LED-drv",
      "Pins": "9"
    }
  },
  "sections": [
    "hero",
    "viewers",
    "readme",
    "breadcrumbs",
    "info"
  ],
  "discovery_triggers": [
    "tx6128"
  ],
  "discovery_pitch": "TX6128 (XDS) component page with datasheet-verified CAD.",
  "author": {
    "name": "Ray"
  },
  "dependencies": {},
  "hero": {
    "type": "image",
    "path": "docs/hero.png"
  },
  "files": [
    "page.json",
    "README.md",
    "tx6128.kicad_sym",
    "tx6128.kicad_mod",
    "tx6128.glb",
    "tx6128.step",
    "tx6128-etched.step",
    "tx6128.lbr",
    "docs/hero.png",
    "docs/tx6128-datasheet.pdf",
    "viewers/symbol.html",
    "viewers/footprint.html"
  ],
  "updated_at": "2026-09-25T13:19:16.528Z"
}