component
UC3844D
Public Made by Adomby adom
Texas Instruments AC-DC Controllers And Regulators, SOIC-14. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.
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README.mdadded+51@@ -0,0 +1,51 @@+# UC3844D++**Texas Instruments** · AC-DC Controllers And Regulators · SOIC-14++UC3844D from Texas Instruments, in a SOIC-14. Pinout and pin descriptions extracted from the manufacturer datasheet (extract_pins, cross-checked by a second model); symbol, footprint, and 3D from KiCad-official CAD.++## Pinout++| Pin | Name | Type | Function |+|---|---|---|---|+| 1 | COMP | output | Error amplifier compensation pin connected to external compensation elements to modify error amplifier output; features internal current limiting and can be forced to GROUND for zero duty cycle control. |+| 2 | NC | unconnected | Not connected. |+| 3 | VFB | input | Inverting input to internal error amplifier for voltage feedback control; typical 2.5V setpoint with maximum 2.55V input range. |+| 4 | NC | unconnected | Not connected. |+| 5 | ISENSE | input | Current sensing input connected to current sensing resistor; PWM comparator uses this signal to terminate OUTPUT switch conduction with maximum 1V peak input and 3V/V gain. |+| 6 | NC | unconnected | Not connected. |+| 7 | RT/CT | bidirectional | Fixed frequency oscillator timing pin where timing resistor RRT connects to VREF and timing capacitor CCT connects to GROUND; frequency set by formula fOSC = 1.72/(RRT×CCT) with maximum 500kHz operation. |+| 8 | PWRGND | power_in | Power ground return path providing ground reference for output gate driver stage. |+| 9 | GROUND | power_in | Analog signal ground providing signal return path; serves as both power and analog ground where PWRGND is absent. |+| 10 | OUTPUT | output | Gate driver output providing and sinking peak current up to 1A for direct MOSFET gate drive; actively held low when VCC is below turn-on threshold. |+| 11 | VC | power_in | Bias power supply input for output gate driver stage; requires bypass capacitor at least 10 times larger than main switch FET gate capacitance. |+| 12 | VCC | power_in | Power supply input operating from 12V to 28V with internal 34V clamp (30V absolute maximum from low impedance source); requires 0.1µF bypass capacitor to GROUND and additional bypass capacitor 10 times main switch FET gate capacitance. |+| 13 | NC | unconnected | Not connected. |+| 14 | VREF | power_in | 5V reference voltage output with ±2% accuracy providing error amplifier bias and oscillator charge current source up to ±20mA. |++## Key specifications++| Parameter | Value |+|---|---|+| Manufacturer | Texas Instruments |+| Package | SOIC-14 |+| Category | Power Management (PMIC) |+| Pins | 14 |++## CAD (KiCad official)++- Symbol: `UC3844D`+- Footprint: `Package_SO:SOIC-14_3.9x8.7mm_P1.27mm`+- 3D model: SOIC-14 (KiCad packages3D, STEP)+- 3D model files: `uc3844d-etched.step` / `uc3844d-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `uc3844d.step` / `uc3844d.glb` are the bare package body.++## Provenance++Data extracted from the manufacturer datasheet, not a distributor listing:++- **Datasheet:** [Texas Instruments datasheet](https://www.ti.com/cn/lit/gpn/uc3842) (61 pp, sha256 `0f875fd24cbb5fda`, retrieved 2026-10-07, 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:** parts-factory `2.0.0` / `extract_pins 0.3`, primary `claude-haiku-4-5-20251001` (text), consensus `claude-sonnet-5-5` (agreed), guards: pin_guards 0.1: passed. Pins are checked against the footprint pad set and their cited datasheet pages before publish.+- **CAD:** KiCad official libraries (CC-BY-SA 4.0).++[Datasheet PDF](docs/uc3844d-datasheet.pdf)
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features internal current limiting and can be forced to GROUND for zero duty cycle control."+ },+ {+ "number": "2",+ "name": "NC",+ "type": "unconnected",+ "description": "Not connected."+ },+ {+ "number": "3",+ "name": "VFB",+ "type": "input",+ "description": "Inverting input to internal error amplifier for voltage feedback control; typical 2.5V setpoint with maximum 2.55V input range."+ },+ {+ "number": "4",+ "name": "NC",+ "type": "unconnected",+ "description": "Not connected."+ },+ {+ "number": "5",+ "name": "ISENSE",+ "type": "input",+ "description": "Current sensing input connected to current sensing resistor; PWM comparator uses this signal to terminate OUTPUT switch conduction with maximum 1V peak input and 3V/V gain."+ },+ {+ "number": "6",+ "name": "NC",+ "type": "unconnected",+ "description": "Not connected."+ },+ {+ "number": "7",+ "name": "RT/CT",+ "type": "bidirectional",+ "description": "Fixed frequency oscillator timing pin where timing resistor RRT connects to VREF and timing capacitor CCT connects to GROUND; frequency set by formula fOSC = 1.72/(RRT×CCT) with maximum 500kHz operation."+ },+ {+ "number": "8",+ "name": "PWRGND",+ "type": "power_in",+ "description": "Power ground return path providing ground reference for output gate driver stage."+ },+ {+ "number": "9",+ "name": "GROUND",+ "type": "power_in",+ "description": "Analog signal ground providing signal return path; serves as both power and analog ground where PWRGND is absent."+ },+ {+ "number": "10",+ "name": "OUTPUT",+ "type": "output",+ "description": "Gate driver output providing and sinking peak current up to 1A for direct MOSFET gate drive; actively held low when VCC is below turn-on threshold."+ },+ {+ "number": "11",+ "name": "VC",+ "type": "power_in",+ "description": "Bias power supply input for output gate driver stage; requires bypass capacitor at least 10 times larger than main switch FET gate capacitance."+ },+ {+ "number": "12",+ "name": "VCC",+ "type": "power_in",+ "description": "Power supply input operating from 12V to 28V with internal 34V clamp (30V absolute maximum from low impedance source); requires 0.1µF bypass capacitor to GROUND and additional bypass capacitor 10 times main switch FET gate capacitance."+ },+ {+ "number": "13",+ "name": "NC",+ "type": "unconnected",+ "description": "Not connected."+ },+ {+ "number": "14",+ "name": "VREF",+ "type": "power_in",+ "description": "5V reference voltage output with ±2% accuracy providing error amplifier bias and oscillator charge current source up to ±20mA."+ }+ ],+ "provenance": {+ "extractor": "extract_pins 0.3",+ "factory_chain": {+ "factory": "2.0.0",+ "extractor": "extract_pins 0.3",+ "primary_model": "claude-haiku-4-5-20251001",+ "primary_mode": "text",+ "consensus_model": "claude-sonnet-5-5",+ "consensus": "agreed",+ "guards": "pin_guards 0.1: passed",+ "guard_notes": [],+ "pages_sent": 38,+ "cost_usd": 0.3619,+ "at": "2026-10-07T01:47:38"+ },+ "datasheet": {+ "url": "https://www.ti.com/cn/lit/gpn/uc3842",+ "pages": 61,+ "sha256": "0f875fd24cbb5fda",+ "source_tier": "lcsc"+ },+ "cad": "KiCad official (CC-BY-SA 4.0)",+ "pins": {+ "total": 14,+ "described": 14,+ "cites_pages": true,+ "refuses_to_fabricate": true+ }+ },+ "viewers": {+ "symbol": "viewers/symbol.html",+ "footprint": "viewers/footprint.html"+ },+ "models_3d": [+ {+ "file": "uc3844d.step",+ "role": "plain",+ "up": "Z",+ "units": "mm",+ "origin": "footprint origin = pad-pattern centre",+ "seat": "z = 0",+ "extents_mm": [+ 6,+ 8.7,+ 1.75+ ],+ "zmin_mm": 0,+ "centre_offset_mm": 0,+ "footprint_binding": "identity",+ "sha256": "3b9a775da256c8afcc28dcddfbc2eb3f266107fe61ce8446d96f2c52b6f44a70",+ "checked": "2026-10-07",+ "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"+ },+ {+ "file": "uc3844d-etched.step",+ "role": "eda",+ "up": "Z",+ "units": "mm",+ "origin": "footprint origin = pad-pattern centre",+ "seat": "z = 0",+ "extents_mm": [+ 6,+ 8.7,+ 1.75+ ],+ "zmin_mm": 0,+ "centre_offset_mm": 0,+ "footprint_binding": "identity",+ "sha256": "974eaab3dd251df2715fac10448bab97a9234124ca255c0bbd47220ed9f1b6b4",+ "checked": "2026-10-07",+ "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"+ }+ ]+ },+ "visibility": "public",+ "org": "adom",+ "author": {+ "name": "Ray",+ "email": "[email protected]"+ }+}