UC3843M

@@ -0,0 +1,49 @@+# UC3843M++**HGSEMI** · AC-DC Controllers and Regulators · SOP-8++UC3843M from HGSEMI, in a SOP-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. Used for loop compensation; an external RC network from COMP to VFB (pin 2) sets the compensation of the voltage feedback loop. |+| 2 | VFB | input | Voltage feedback input - inverting input of the internal error amplifier. Typically connected to the switching power supply output through a resistor divider; internally compared against the 2.5 V reference. |+| 3 | ISENSE | input | Current sense input. A voltage proportional to the switching inductor current is applied here (typically from a sense resistor Rs). The PWM latch resets and terminates the output pulse when this input exceeds ~1.0 V. |+| 4 | RT/CT | passive | Oscillator timing pin. Connect RT from VREF (pin 8) to this pin, and CT from this pin to GND to set the oscillator frequency and maximum duty cycle. Maximum operating frequency up to 500 kHz. |+| 5 | GND | power_in | Device ground. Common return for control-circuit bias current and reference for all internal voltages. |+| 6 | OUTPUT | output | Totem-pole gate-drive output. Directly drives the gate of an external power MOSFET; capable of sourcing/sinking up to ±1 A peak. Held low when Vcc is below the UVLO threshold. |+| 7 | VCC | power_in | Positive supply input for the IC. Operating range approximately 8.4 V (UVLO turn-on) to 30 V (absolute max); startup current <0.5 mA, operating supply current typ. 12 mA. Internal 34 V zener clamp on this pin. |+| 8 | VREF | power_out | 5.0 V precision reference output (4.90-5.10 V, 1 mA load). Provides charging current through RT to the timing capacitor CT and can supply external loads up to ~20 mA; short-circuit current typ. -100 mA. |++## Key specifications++| Parameter | Value |+|---|---|+| Manufacturer | HGSEMI |+| Package | SOP-8 |+| Category | PMIC |+| Pins | 8 |++## Ordering variants++- `UC3843MM/TR`+- `UC3843MN`++## CAD (KiCad official)++- Symbol: `UC3843M`+- Footprint: `Package_SO:SOIC-8_3.9x4.9mm_P1.27mm`+- 3D model: SOP-8 (KiCad packages3D, STEP)++## Provenance++Data extracted from the manufacturer datasheet, not a distributor listing:++- **Datasheet:** [HGSEMI datasheet](docs/uc3843m-datasheet.pdf) (10 pp, sha256 `549a60aef8d59c3f`, 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/uc3843m-datasheet.pdf)

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