TL2843BD-8

@@ -0,0 +1,50 @@+# TL2843BD-8++**Texas Instruments** · AC-DC Controllers And Regulators · SOIC-8++TL2843BD-8 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 output / compensation node. Used to close the voltage feedback loop by connecting a compensation network (typically an RC network) between this pin and VFB. Internally clamped to set the peak current-sense threshold. |+| 2 | VFB | input | Inverting input of the internal error amplifier. Feedback voltage from the converter output is divided down and applied here; the amplifier compares it against the internal 2.5 V reference to regulate the output. |+| 3 | ISENSE | input | Current-sense input. A voltage proportional to the primary switch current (developed across a sense resistor) is applied here. The internal PWM comparator terminates the output pulse when this pin reaches ~1 V, providing cycle-by-cycle current limiting. |+| 4 | RT/CT | passive | Oscillator timing pin. An external resistor to VREF and capacitor to GND set the oscillator frequency (fOSC ≈ 1.72 / (RT·CT)). Also sets the maximum duty cycle via the discharge current. |+| 5 | GND | power_in | Signal and power ground return. All internal circuitry is referenced to this pin; connect to system ground with a low-inductance path. |+| 6 | OUT | output | High-current totem-pole gate-drive output. Directly drives the gate of an external power MOSFET; typical peak source/sink current of ±1 A. Output swings from GND to VCC. |+| 7 | VCC | power_in | Positive supply input for the controller and output stage. UVLO thresholds are 16 V (turn-on) / 10 V (turn-off) for the '-8' variant. Absolute maximum 30 V; bypass with a low-ESR capacitor close to the pin. |+| 8 | VREF | power_out | Buffered 5 V ±2% reference output. Capable of sourcing up to ~50 mA for external circuitry and for programming the oscillator via RT. Requires a bypass capacitor (typ. 0.1 µF) to GND for stability. |++## Key specifications++| Parameter | Value |+|---|---|+| Manufacturer | Texas Instruments |+| Package | SOIC-8 |+| Category | Power Management (PMIC) |+| Pins | 8 |++## Ordering variants++Same part, different packaging or reel option.++- `TL2843BD-8D`+- `TL2843BD-8DR`++## CAD (KiCad official)++- Symbol: `TL2843BD-8`+- 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/tl2843b.pdf) (None pp, sha256 `42e42dc7a6e780d9`, 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/tl2843bd-8-datasheet.pdf)

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