UC3843BN

@@ -0,0 +1,48 @@+# UC3843BN++**STMicroelectronics** · AC-DC Controllers and Regulators · DIP-8++UC3843BN from STMicroelectronics, in a DIP-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 pin, made available for external loop compensation. Typically connected via an RC network back to VFB (pin 2) to shape the control-loop response. Output high ~6.2V, output low ~0.8V-1.1V. |+| 2 | VFB | input | Inverting input of the internal Error Amplifier. Normally connected to the switching power supply output via a resistor divider for regulation feedback. Non-inverting input is internally tied to the 2.5V reference; input bias current typ -0.1uA. |+| 3 | ISENSE | input | Current sense input. A voltage proportional to the inductor/switch current (typically developed across a sense resistor) is applied here. The PWM comparator uses this to terminate the output switch conduction on a cycle-by-cycle basis. Maximum input signal ~1V. |+| 4 | RT/CT | passive | Oscillator timing pin. Programs the switching frequency and maximum output duty cycle by connecting timing resistor RT from this pin to VREF (pin 8) and timing capacitor CT from this pin to GROUND. Operation up to 500kHz is possible. |+| 5 | GROUND | power_in | Combined control-circuit and power ground return. All voltages in the datasheet are referenced to this pin. Single-point grounding is recommended due to high peak output currents. |+| 6 | OUTPUT | output | High-current totem-pole gate drive output for directly driving the gate of an external power N-channel MOSFET. Peak source/sink currents up to +/-1A. Output high ~13.5V @ 20mA source; output low ~0.1V @ 20mA sink. Rise/fall times ~50ns typ into 1nF. |+| 7 | Vi | power_in | Positive supply (VCC) of the control IC. Absolute maximum supply voltage 30V (low-impedance source); the pin is self-limiting from a high-impedance source (internal Zener ~36V @ 25mA). UC3843B UVLO turn-on threshold ~8.5V, turn-off ~7.9V. Operating supply current typ 12mA. |+| 8 | VREF | power_out | Trimmed 5.0V reference output (5V, 50mA). Provides charging current for timing capacitor CT through timing resistor RT, and can be used as a reference/supply for external circuitry. Short-circuit current typ -100mA. |++## Key specifications++| Parameter | Value |+|---|---|+| Manufacturer | STMicroelectronics |+| Package | DIP-8 |+| Category | PMIC |+| Pins | 8 |++## Ordering variants++- `UC3843BNN`+- `UC3843BND1`++## CAD (KiCad official)++- Symbol: `UC3843BN`+- Footprint: `Package_DIP:DIP-8_W7.62mm`+- 3D model: DIP-8 (KiCad packages3D, STEP)++## Provenance++Data extracted from the manufacturer datasheet, not a distributor listing:++- **Datasheet:** [STMicroelectronics datasheet](docs/uc3843bn-datasheet.pdf) (15 pp, sha256 `62066370bcc6f048`, 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/uc3843bn-datasheet.pdf)

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