TX6128

@@ -0,0 +1,45 @@+# TX6128++**XDS** · LED Drivers · ESOP-8++TX6128 from XDS, in a ESOP-8. Pinout and pin descriptions extracted from the manufacturer datasheet by ds2sf; symbol, footprint, and 3D from KiCad-official CAD.++## Pinout++| Pin | Name | Type | Function |+|---|---|---|---|+| 1 | GND | power_in | 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. |+| 2 | NC | unconnected | No connection. Leave floating (per datasheet '悬空'). |+| 3 | DIM | input | 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. |+| 4 | SW | power_out | 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. |+| 5 | CS | input | 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). |+| 6 | CS | input | 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. |+| 7 | TOFF | input | 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. |+| 8 | VDD | power_in | 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). |+| 9 | EP | power_out | 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. |++## Key specifications++| Parameter | Value |+|---|---|+| Manufacturer | XDS |+| Package | ESOP-8 |+| Category | LED-drv |+| Pins | 9 |++## CAD (KiCad official)++- Symbol: `TX6128`+- Footprint: `Package_SO:SOIC-8-1EP_3.9x4.9mm_P1.27mm_EP2.41x3.3mm`+- 3D model: ESOP-8 (KiCad packages3D, STEP)++## Provenance++Data extracted from the manufacturer datasheet, not a distributor listing:++- **Datasheet:** [XDS datasheet](docs/tx6128-datasheet.pdf) (7 pp, sha256 `445f3da27fe5f2f2`, retrieved 2026-08-17, tier: lcsc)+- **Datasheet language:** Chinese. Pin names, descriptions, and specs on this page were extracted and translated to English by ds2sf; the linked PDF is the manufacturer original.+- **Extractor:** `ds2sf` (Claude). Every pin and dimension is cited to a datasheet page; it refuses to fabricate.+- **CAD:** KiCad official libraries (CC-BY-SA 4.0).++[Datasheet PDF](docs/tx6128-datasheet.pdf)

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