component
UC3854DWTR
Public Made by Adomby adom
Texas Instruments AC-DC Controllers And Regulators, SOIC-16-300mil. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.
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README.mdadded+52@@ -0,0 +1,52 @@+# UC3854DWTR++**Texas Instruments** · AC-DC Controllers And Regulators · SOIC-16-300mil++UC3854DWTR from Texas Instruments, in a SOIC-16-300mil. 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 | GND | power_in | Ground reference for all voltages; VCC and VREF must be bypassed directly to GND with a 0.1-µF or larger ceramic capacitor, and the timing-capacitor discharge current also returns here. |+| 2 | PKLMT | input | Peak current-limit input with a 0-V threshold, connected to the negative side of the current-sense resistor, with an absolute maximum input voltage of 5 V. |+| 3 | CAOUT | output | Current-amplifier output that swings close to GND so the PWM can force zero duty cycle, with an NPN emitter-follower pullup and an 8-kΩ resistor to ground, and it stays active when the IC is disabled. |+| 4 | ISENSE | input | Inverting input of the current amplifier that stays functional down to and below GND, and must not be taken below -0.5 V because it is diode-protected to GND. |+| 5 | MULTOUT | bidirectional | Multiplier output tied to the non-inverting current-amplifier input, a high-impedance node with a -0.3 V to 2.5 V input range that must not be taken below -0.5 V. |+| 6 | IAC | input | Line-waveform current input whose voltage is internally held at 6 V, with the line current ranging from zero to about 400 µA at the waveform peak and an absolute maximum input current of 10 mA. |+| 7 | VAOUT | output | Voltage-amplifier output internally limited to about 5.8 V, with an NPN emitter-follower pullup and an 8-kΩ resistor to ground, and output levels below 1 V inhibit the multiplier output. |+| 8 | VRMS | input | RMS line-voltage input that must stay between 1.5 V and 3.5 V for best control, with an absolute maximum input voltage of 11 V. |+| 9 | VREF | power_in | Accurate 7.5-V reference output that can deliver 10 mA to peripheral circuitry, is short-circuit current limited, is held at 0 V when VCC or ENA is low, and should be bypassed with 0.1 µF or larger. |+| 10 | ENA | input | Logic enable input with a rising threshold of 2.4 V to 2.7 V (2.55 V typical) and about 0.25 V typical hysteresis, internally clamped to about 14 V, and it must be tied to 5 V or pulled high through 22 kΩ when unused. |+| 11 | VSENSE | input | Inverting input of the voltage amplifier, normally connected to the feedback network from the boost output, with a 7.5-V threshold, an absolute maximum input voltage of 11 V, and a bias current limited to ±500 nA. |+| 12 | RSET | input | Resistor to GND that sets the oscillator charging current and the maximum multiplier output, where multiplier output current does not exceed 3.75 V divided by the RSET resistance, with an absolute maximum input current of 10 mA. |+| 13 | SS | input | Soft-start pin held at GND while the device is disabled or VCC is low, pulled up to over 8 V by an internal current source once VCC is valid and the IC is enabled, and quickly discharged to ground on disable or supply dropout. |+| 14 | CT | input | Oscillator timing capacitor connected from CT to GND that sets the PWM oscillator frequency together with RSET, calculated per Equation 1 in the datasheet. |+| 15 | VCC | power_in | Positive supply with a recommended range of 10 V to 20 V and an absolute maximum of 35 V; it must exceed the 16 V typical turn-on threshold to start switching and stay above the 10 V typical turn-off threshold, and must deliver at least 20 mA. |+| 16 | GTDRV | output | Totem-pole MOSFET gate-driver output internally clamped to 15 V, which should use a series gate resistor of at least 5 Ω, with absolute maximum gate-driver current of 1.5 A peak at 50% duty cycle and 0.5 A continuous. |++## Key specifications++| Parameter | Value |+|---|---|+| Manufacturer | Texas Instruments |+| Package | SOIC-16-300mil |+| Category | Power Management (PMIC) |+| Pins | 16 |++## CAD (KiCad official)++- Symbol: `UC3854DWTR`+- Footprint: `Package_SO:SOIC-16_3.9x9.9mm_P1.27mm`+- 3D model: SOIC-16-300mil (KiCad packages3D, STEP)+- 3D model files: `uc3854dwtr-etched.step` / `uc3854dwtr-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `uc3854dwtr.step` / `uc3854dwtr.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/uc3854) (31 pp, sha256 `051276b5d66559af`, retrieved 2026-10-07, tier: lcsc)+- **Extractor:** parts-factory `2.0.0` / `extract_pins 0.3`, primary `claude-haiku-5-5` (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/uc3854dwtr-datasheet.pdf)
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VCC and VREF must be bypassed directly to GND with a 0.1-µF or larger ceramic capacitor, and the timing-capacitor discharge current also returns here."+ },+ {+ "number": "2",+ "name": "PKLMT",+ "type": "input",+ "description": "Peak current-limit input with a 0-V threshold, connected to the negative side of the current-sense resistor, with an absolute maximum input voltage of 5 V."+ },+ {+ "number": "3",+ "name": "CAOUT",+ "type": "output",+ "description": "Current-amplifier output that swings close to GND so the PWM can force zero duty cycle, with an NPN emitter-follower pullup and an 8-kΩ resistor to ground, and it stays active when the IC is disabled."+ },+ {+ "number": "4",+ "name": "ISENSE",+ "type": "input",+ "description": "Inverting input of the current amplifier that stays functional down to and below GND, and must not be taken below -0.5 V because it is diode-protected to GND."+ },+ {+ "number": "5",+ "name": "MULTOUT",+ "type": "bidirectional",+ "description": "Multiplier output tied to the non-inverting current-amplifier input, a high-impedance node with a -0.3 V to 2.5 V input range that must not be taken below -0.5 V."+ },+ {+ "number": "6",+ "name": "IAC",+ "type": "input",+ "description": "Line-waveform current input whose voltage is internally held at 6 V, with the line current ranging from zero to about 400 µA at the waveform peak and an absolute maximum input current of 10 mA."+ },+ {+ "number": "7",+ "name": "VAOUT",+ "type": "output",+ "description": "Voltage-amplifier output internally limited to about 5.8 V, with an NPN emitter-follower pullup and an 8-kΩ resistor to ground, and output levels below 1 V inhibit the multiplier output."+ },+ {+ "number": "8",+ "name": "VRMS",+ "type": "input",+ "description": "RMS line-voltage input that must stay between 1.5 V and 3.5 V for best control, with an absolute maximum input voltage of 11 V."+ },+ {+ "number": "9",+ "name": "VREF",+ "type": "power_in",+ "description": "Accurate 7.5-V reference output that can deliver 10 mA to peripheral circuitry, is short-circuit current limited, is held at 0 V when VCC or ENA is low, and should be bypassed with 0.1 µF or larger."+ },+ {+ "number": "10",+ "name": "ENA",+ "type": "input",+ "description": "Logic enable input with a rising threshold of 2.4 V to 2.7 V (2.55 V typical) and about 0.25 V typical hysteresis, internally clamped to about 14 V, and it must be tied to 5 V or pulled high through 22 kΩ when unused."+ },+ {+ "number": "11",+ "name": "VSENSE",+ "type": "input",+ "description": "Inverting input of the voltage amplifier, normally connected to the feedback network from the boost output, with a 7.5-V threshold, an absolute maximum input voltage of 11 V, and a bias current limited to ±500 nA."+ },+ {+ "number": "12",+ "name": "RSET",+ "type": "input",+ "description": "Resistor to GND that sets the oscillator charging current and the maximum multiplier output, where multiplier output current does not exceed 3.75 V divided by the RSET resistance, with an absolute maximum input current of 10 mA."+ },+ {+ "number": "13",+ "name": "SS",+ "type": "input",+ "description": "Soft-start pin held at GND while the device is disabled or VCC is low, pulled up to over 8 V by an internal current source once VCC is valid and the IC is enabled, and quickly discharged to ground on disable or supply dropout."+ },+ {+ "number": "14",+ "name": "CT",+ "type": "input",+ "description": "Oscillator timing capacitor connected from CT to GND that sets the PWM oscillator frequency together with RSET, calculated per Equation 1 in the datasheet."+ },+ {+ "number": "15",+ "name": "VCC",+ "type": "power_in",+ "description": "Positive supply with a recommended range of 10 V to 20 V and an absolute maximum of 35 V; it must exceed the 16 V typical turn-on threshold to start switching and stay above the 10 V typical turn-off threshold, and must deliver at least 20 mA."+ },+ {+ "number": "16",+ "name": "GTDRV",+ "type": "output",+ "description": "Totem-pole MOSFET gate-driver output internally clamped to 15 V, which should use a series gate resistor of at least 5 Ω, with absolute maximum gate-driver current of 1.5 A peak at 50% duty cycle and 0.5 A continuous."+ }+ ],+ "provenance": {+ "extractor": "extract_pins 0.3",+ "factory_chain": {+ "factory": "2.0.0",+ "extractor": "extract_pins 0.3",+ "primary_model": "claude-haiku-5-5",+ "primary_mode": "text",+ "consensus_model": "claude-sonnet-5-5",+ "consensus": "agreed",+ "guards": "pin_guards 0.1: passed",+ "guard_notes": [+ "extractor flagged: The package hint SOIC-16-300mil is matched to the datasheet's SOIC (DW), 16-pin package, body 7.50 m; Internal inconsistency in the SS pin data: the Pin Functions text and Section 9 say the soft-start s; The NC pins (1, 6, 11, 16) appear only in the 20-pin PLCC column of the pin table, so the 16-pin SOI"+ ],+ "pages_sent": 15,+ "cost_usd": 0.101,+ "at": "2026-10-07T21:35:26"+ },+ "datasheet": {+ "url": "https://www.ti.com/cn/lit/gpn/uc3854",+ "pages": 31,+ "sha256": "051276b5d66559af",+ "source_tier": "lcsc"+ },+ "cad": "KiCad official (CC-BY-SA 4.0)",+ "pins": {+ "total": 16,+ "described": 16,+ "cites_pages": true,+ "refuses_to_fabricate": true+ }+ },+ "viewers": {+ "symbol": "viewers/symbol.html",+ "footprint": "viewers/footprint.html"+ },+ "models_3d": [+ {+ "file": "uc3854dwtr.step",+ "role": "plain",+ "up": "Z",+ "units": "mm",+ "origin": "footprint origin = pad-pattern centre",+ "seat": "z = 0",+ "extents_mm": [+ 6,+ 9.9,+ 1.75+ ],+ "zmin_mm": 0,+ "centre_offset_mm": 0,+ "footprint_binding": "identity",+ "sha256": "d5eeddb4c0b304dc61950919b126fc61d7586abd5f16ab71a2a79759ec6498bf",+ "checked": "2026-10-07",+ "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"+ },+ {+ "file": "uc3854dwtr-etched.step",+ "role": "eda",+ "up": "Z",+ "units": "mm",+ "origin": "footprint origin = pad-pattern centre",+ "seat": "z = 0",+ "extents_mm": [+ 6,+ 9.9,+ 1.75+ ],+ "zmin_mm": 0,+ "centre_offset_mm": 0,+ "footprint_binding": "identity",+ "sha256": "10d7e8b61726c1c33f5cbbfc9a87463f0f5c30ac1fb0adbbb4599a4aa542da06",+ "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]"+ }+}