TX6122

@@ -0,0 +1,45 @@+# TX6122++**XDS** · LED Drivers · ESOP-8++TX6122 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 return. Should tie to the low side of the RCS current-sense resistor with a short, wide trace to preserve current-sense accuracy. |+| 2 | NC | unconnected | No connect. Leave floating (悬空). |+| 3 | DIM | input | Dimming input. Supports PWM dimming and linear dimming (linear range 1.1V-3.1V). Below ~0.9V the LED output is disabled; above 3.1V output is 100%. Must not be left floating; when unused, tie high. For linear dimming, add a >=10nF cap to GND. |+| 4 | SW | output | Switch node, internally the drain of the integrated 60V power NMOS (RDS(on)~30mΩ at VGS=5V). Connects to the buck inductor / freewheeling diode. Absolute-max SW voltage 60V. |+| 5 | CS | input | Inductor peak current sense input. Tied together with pin 6 to the top of the external RCS sense resistor; the MOS turns off when V(CS) reaches VCS_TH (~255mV typ). |+| 6 | CS | input | Inductor peak current sense input (duplicate of pin 5). Both CS pins connect to the top of the RCS sense resistor for the peak-current comparator. |+| 7 | TOFF | input | Fixed off-time programming pin. An external capacitor COFF to GND sets TOFF = 0.51 * 150kΩ * (COFF + 7.3pF) + 61ns. With TOFF open, the internal minimum off-time is ~650ns. |+| 8 | VDD | power_in | Chip supply pin. Fed from VIN through an external dropping resistor RVDD = (VIN - VDD) / IVDD; internally clamped by a zener at ~5.5V (max clamp current 10mA). Operating current ~1.5mA at Fop=200kHz; standby ~200uA. UVLO rising ~3.2V with 0.5V hysteresis. |+| 9 | EP | passive | Exposed thermal pad on the ESOP-8 bottom. Internally connected to the SW pin (MOS drain). Solder to the SW copper island for heat dissipation; do NOT tie to GND. |++## Key specifications++| Parameter | Value |+|---|---|+| Manufacturer | XDS |+| Package | ESOP-8 |+| Category | LED-drv |+| Pins | 9 |++## CAD (KiCad official)++- Symbol: `TX6122`+- 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/tx6122-datasheet.pdf) (7 pp, sha256 `09f4d87b0667435d`, 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/tx6122-datasheet.pdf)

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