component
UC3845D
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 @@+# UC3845D++**Texas Instruments** · AC-DC Controllers And Regulators · SOIC-14++UC3845D 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 for external compensation network connection to modify output voltage and enable pulse-by-pulse current limiting with internal current limit control. |+| 2 | NC | unconnected | No connection. |+| 3 | VFB | input | Error amplifier inverting input with -2µA input bias current accepting feedback voltage maximum 2.58V for voltage-loop control and closed-loop output regulation. |+| 4 | NC | unconnected | No connection. |+| 5 | ISENSE | input | Primary-side current-sense input to PWM comparator accepting maximum 1.0V nominal with -10µA input bias current and 150-300ns propagation delay for OUTPUT pulse termination. |+| 6 | NC | unconnected | No connection. |+| 7 | RT/CT | bidirectional | Oscillator timing pin with 1.7V peak-to-peak amplitude; connect timing resistor (5kΩ minimum) from VREF and timing capacitor (1nF to 100nF) to GROUND for programmable frequency 100-500kHz using fOSC = 1.72/(RRT×CCT). |+| 8 | PWRGND | power_in | Power stage ground providing high-current return path for output driver stage; requires direct connection to IC power devices for low-impedance connection. |+| 9 | GROUND | power_in | Analog signal ground serving as low-impedance reference for control circuits and power return path when separate PWRGND is not available. |+| 10 | OUTPUT | output | Gate driver output capable of sourcing and sinking ±1A peak current with 25-150ns rise and fall time for direct MOSFET gate drive; actively held low when VCC below turn-on threshold. |+| 11 | VC | power_in | Bias power supply input for output gate driver stage (14-pin SOIC variant only); requires bypass capacitor value at least 10 times the main switch FET gate capacitance. |+| 12 | VCC | power_in | Device power supply input requiring 12V to 28V operating range; total supply current equals static ICC (11-17mA) plus average output driver current; requires 0.1µF ceramic bypass capacitor. |+| 13 | NC | unconnected | No connection. |+| 14 | VREF | power_in | 5V ±2% precision reference voltage output (4.9-5.1V for UC384x) with 180mA short-circuit current capability, 50μV output noise, and 0.1µF ceramic bypass capacitor required. |++## Key specifications++| Parameter | Value |+|---|---|+| Manufacturer | Texas Instruments |+| Package | SOIC-14 |+| Category | Power Management (PMIC) |+| Pins | 14 |++## CAD (KiCad official)++- Symbol: `UC3845D`+- Footprint: `Package_SO:SOIC-14_3.9x8.7mm_P1.27mm`+- 3D model: SOIC-14 (KiCad packages3D, STEP)+- 3D model files: `uc3845d-etched.step` / `uc3845d-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `uc3845d.step` / `uc3845d.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 2026-10-06, 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/uc3845d-datasheet.pdf)
page.jsonadded+194@@ -0,0 +1,194 @@+{+ "slug": "uc3845d",+ "version": "0.1.0",+ "type": "component",+ "description": "Texas Instruments AC-DC Controllers And Regulators, SOIC-14. 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connect timing resistor (5kΩ minimum) from VREF and timing capacitor (1nF to 100nF) to GROUND for programmable frequency 100-500kHz using fOSC = 1.72/(RRT×CCT)."+ },+ {+ "number": "8",+ "name": "PWRGND",+ "type": "power_in",+ "description": "Power stage ground providing high-current return path for output driver stage; requires direct connection to IC power devices for low-impedance connection."+ },+ {+ "number": "9",+ "name": "GROUND",+ "type": "power_in",+ "description": "Analog signal ground serving as low-impedance reference for control circuits and power return path when separate PWRGND is not available."+ },+ {+ "number": "10",+ "name": "OUTPUT",+ "type": "output",+ "description": "Gate driver output capable of sourcing and sinking ±1A peak current with 25-150ns rise and fall time for direct MOSFET gate drive; actively held low when VCC below turn-on threshold."+ },+ {+ "number": "11",+ "name": "VC",+ "type": "power_in",+ "description": "Bias power supply input for output gate driver stage (14-pin SOIC variant only); requires bypass capacitor value at least 10 times the main switch FET gate capacitance."+ },+ {+ "number": "12",+ "name": "VCC",+ "type": "power_in",+ "description": "Device power supply input requiring 12V to 28V operating range; total supply current equals static ICC (11-17mA) plus average output driver current; requires 0.1µF ceramic bypass capacitor."+ },+ {+ "number": "13",+ "name": "NC",+ "type": "unconnected",+ "description": "No connection."+ },+ {+ "number": "14",+ "name": "VREF",+ "type": "power_in",+ "description": "5V ±2% precision reference voltage output (4.9-5.1V for UC384x) with 180mA short-circuit current capability, 50μV output noise, and 0.1µF ceramic bypass capacitor required."+ }+ ],+ "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": 0.3899,+ "at": "2026-10-06T17:26:23"+ },+ "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"+ }+ },+ "visibility": "public",+ "org": "adom",+ "author": {+ "name": "Ray",+ "email": "[email protected]"+ }+}