UC3845BN

@@ -0,0 +1,48 @@+# UC3845BN++**STMicroelectronics** · AC-DC Controllers and Regulators · DIP-8++UC3845BN 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 made available for loop compensation. Typically an RC network is connected between this pin and VFB (pin 2) to shape the control-loop response. |+| 2 | VFB | input | Inverting input of the internal error amplifier. Normally connected to the switching power supply output through a resistor divider; the non-inverting input is internally tied to the 2.5 V reference. |+| 3 | ISENSE | input | Current-sense input. A voltage proportional to the primary/inductor current is applied here; the PWM comparator terminates the output switch conduction when this pin reaches the error-amp-derived threshold (max input signal ~1 V, gain 3 V/V). |+| 4 | RT/CT | passive | Oscillator timing pin. A resistor RT from this pin to VREF and a capacitor CT from this pin to GROUND set the oscillator frequency and the maximum output duty cycle. Operation up to 500 kHz is possible. |+| 5 | GROUND | power_in | Common control-circuitry and power-stage return. All voltages in the datasheet are referenced to this pin; timing and bypass capacitors must connect close to this pin in a single-point ground. |+| 6 | OUTPUT | output | High-current totem-pole gate-drive output for an external N-channel power MOSFET. Peak source/sink currents up to 1 A; typical rise/fall times ~50 ns into 1 nF. |+| 7 | VCC | power_in | Positive supply of the control IC (labeled Vi in the block diagram/absolute-maximum table). Max 30 V (self-limiting via internal ~36 V zener). UVLO turn-on 8.5 V typ, turn-off 7.9 V typ; operating supply current ~12 mA typ. |+| 8 | VREF | power_out | Buffered 5.0 V reference output (5 V, 50 mA capable). Provides charging current for the timing capacitor CT through the timing resistor RT and can bias external circuitry. |++## Key specifications++| Parameter | Value |+|---|---|+| Manufacturer | STMicroelectronics |+| Package | DIP-8 |+| Category | PMIC |+| Pins | 8 |++## Ordering variants++- `UC3845BNN`+- `UC3845BND1`++## CAD (KiCad official)++- Symbol: `UC3845BN`+- 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/uc3845bn-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/uc3845bn-datasheet.pdf)

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