UC2843D8TR

@@ -0,0 +1,59 @@+# UC2843D8TR++**Texas Instruments** · DC-DC Converters · SOIC-8++UC2843D8TR from Texas Instruments, in a SOIC-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 | COMP | output | Error amplifier compensation pin. Connect external compensation components to modify the error amplifier output. The error amplifier is internally current-limited; forcing COMP to GROUND commands zero duty cycle. |+| 2 | VFB | input | Inverting input to the internal error amplifier. VFB is used to control the power converter voltage-feedback loop for stability. Internal reference is 2.5 V. |+| 3 | ISENSE | input | Primary-side current sense input. Connect to the current sensing resistor; the PWM uses this signal to terminate OUTPUT switch conduction. Max input 1 V; a voltage ramp can be applied here for voltage-mode control. |+| 4 | RT/CT | bidirectional | Fixed-frequency oscillator set point. Connect a timing resistor R_RT to VREF and timing capacitor C_CT to GROUND to set the switching frequency. f_OSC = 1.72 / (R_RT * C_CT); R_RT must be >=5 kΩ. Up to 500 kHz operation. |+| 5 | GROUND | power_in | Analog and power ground return for the device. In the 8-pin package (no separate PWRGND), GROUND serves as both analog and power ground. |+| 6 | OUTPUT | output | Gate drive for the external N-channel MOSFET. On-chip totem-pole driver sources and sinks peak currents up to 1 A. OUTPUT is actively held low when VCC is below the turnon (UVLO) threshold. |+| 7 | VCC | power_in | Analog controller bias input that also powers the gate driver in the 8-pin package. Recommended supply 12-28 V; abs max 30 V (self-limiting above I_VCC = 30 mA). Requires a ~0.1 µF bypass to GROUND plus an additional bypass at least 10x the gate capacitance of the switching FET. |+| 8 | VREF | power_out | 5 V trimmed reference output. Provides charging current to the oscillator timing capacitor through R_RT. Requires a minimum 0.1 µF ceramic bypass to GROUND close to the pin. Max load current 20 mA. |++## Key specifications++| Parameter | Value |+|---|---|+| Manufacturer | Texas Instruments |+| Package | SOIC-8 |+| Category | PMIC |+| Pins | 8 |++## Ordering variants++Same part, different packaging or reel option.++- `UC2843D8TRD`+- `UC2843D8TR`+- `UC2843D8TRDR`+- `UC2843D8TRN`+- `UC2843D8TRP`+- `UC2843D8TRJ`+- `UC2843D8TRJG`+- `UC2843D8TRD14`+- `UC2843D8TRDW`+- `UC2843D8TRW`+- `UC2843D8TRFK`++## CAD (KiCad official)++- Symbol: `UC2843D8TR`+- Footprint: `Package_SO:SOIC-8_3.9x4.9mm_P1.27mm`+- 3D model: SOIC-8 (KiCad packages3D, STEP)++## Provenance++Data extracted from the manufacturer datasheet, not a distributor listing:++- **Datasheet:** [Texas Instruments datasheet](https://www.ti.com/lit/ds/symlink/uc2843d8tr.pdf) (56 pp, sha256 `0a519514b4917848`, retrieved 2026-08-17, tier: manufacturer)+- **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/uc2843d8tr-datasheet.pdf)

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