TX6121

@@ -0,0 +1,41 @@+# TX6121++**XDS** · LED Drivers · SOT-23-6++TX6121 from XDS, in a SOT-23-6. 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 | DRV | output | External MOSFET gate driver output. Drives the gate of the external N-channel power MOS switch. Typical rise/fall time 50 ns into 500 pF load; minimum on-time 250 ns. |+| 2 | GND | power_in | Device ground reference for all internal circuitry and the CS sense resistor return. |+| 3 | DIM | input | Dimming input. Pulling below ~0.2 V shuts off the LED output; driving above 1.3 V gives 100% output current. Supports both PWM dimming and linear (analog) dimming with an analog range of 0.3-1.25 V. Must not be left floating; tie high if dimming is not used. For linear dimming, connect a small (>=10 nF) capacitor to GND. |+| 4 | VDD | power_in | Chip supply pin with internal VDD shunt (zener) regulator, typically clamped at 5.5 V (I_VDD < 10 mA). Fed from the input rail (3.6-100 V) through an external dropping resistor R1 = (VIN - VDD)/I_VDD. UVLO threshold 3.2 V (rising) with 0.5 V hysteresis; operating current 1.3 mA at 200 kHz. |+| 5 | TOFF | input | Off-time setting pin. Fixed switch off-time is set by a capacitor C1 to GND via T_OFF = 0.51 x 150 kOhm x (C1 + 8 pF) + T_D, where T_D = 61 ns. With no external capacitor, off-time defaults to ~650 ns (internal). |+| 6 | CS | input | Inductor peak current sense input. Compared against internal threshold VCS_TH (typ 255 mV, 245-265 mV) to terminate the MOSFET on-cycle. Connect to the top of the external current-sense resistor R2 between the MOSFET source and GND. |++## Key specifications++| Parameter | Value |+|---|---|+| Manufacturer | XDS |+| Package | SOT-23-6 |+| Category | LED-drv |+| Pins | 6 |++## CAD (KiCad official)++- Symbol: `TX6121`+- Footprint: `Package_TO_SOT_SMD:SOT-23-6`+- 3D model: SOT-23-6 (KiCad packages3D, STEP)++## Provenance++Data extracted from the manufacturer datasheet, not a distributor listing:++- **Datasheet:** [XDS datasheet](docs/tx6121-datasheet.pdf) (7 pp, sha256 `771392e4b805f3f6`, retrieved 2026-08-17, tier: lcsc)+- **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/tx6121-datasheet.pdf)

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