component
UCC2891PWR
Public Made by Adomby adom
Texas Instruments AC-DC Controllers And Regulators, TSSOP-16. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.
3D Model
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Symbol & Footprint
Schematic Symbol
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PCB Footprint
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Datasheet
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README
markdownUCC2891PWR
Texas Instruments · AC-DC Controllers And Regulators · TSSOP-16
UCC2891PWR from Texas Instruments, in a TSSOP-16. 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 | RTDEL | input | A resistor from this pin to GND programs the turn-on delay between the OUT and AUX gate drive outputs for active clamp resonant transitions. |
| 2 | RTON | input | A resistor to GND programs the internal current source that charges the internal timing capacitor, setting frequency and maximum duty cycle with RTOFF (pin is held at about 2.5 V). |
| 3 | RTOFF | input | A resistor to GND programs the internal current source that discharges the internal timing capacitor, setting frequency and maximum duty cycle with RTON (pin is held at about 2.5 V). |
| 4 | VREF | power_out | 5-V reference output that can supply up to about 5 mA to an external load and needs a ceramic bypass capacitor to GND (recommended 0.22 µF, min 0.022 µF, max about 22 µF). |
| 5 | SYNC | input | Unidirectional synchronization input for the internal oscillator, with minimum pulse width of about 50 ns and sync frequency higher than the free-running frequency. |
| 6 | GND | power_in | Fundamental analog ground for the PWM control and programming circuitry, to be connected externally and directly to PGND. |
| 7 | CS | input | Current-sense input for peak current-mode control and pulse-by-pulse current limiting, with a threshold of about 0.75 V for the UCC2891, fed through an RC filter from the sense resistor. |
| 8 | RSLOPE | input | A resistor to GND programs the internal current source that sets the slope compensation ramp amplitude for current mode control. |
| 9 | FB | input | Feedback input for the error signal from an optocoupler or error amplifier, with a useful range of about 1.25 V to 4.5 V and a pull-up resistor to VREF. |
| 10 | SS/SD | input | A capacitor to GND is charged and discharged by a current equal to IRTON to set the soft-start interval and soft-stop shutdown, with a discharge/shutdown threshold of 0.4 to 0.6 V. |
| 11 | PGND | power_in | Power ground and current return for the high-current OUT and AUX drivers, to be connected externally and directly to GND since the two are not connected internally. |
| 12 | AUX | output | Output driving the P-channel auxiliary clamp MOSFET (active low on the UCC2891), on when the main switch is off, with 2-A source and 2-A sink capability. |
| 13 | OUT | output | High-current output driving the main N-channel PWM switching MOSFET with 2-A source and 2-A sink, with a 10-kΩ resistor to PGND recommended. |
| 14 | VDD | power_in | Supply for the device and gate drivers, recommended 8.5 to 16 V (absolute max 16.5 V), with a 1-µF capacitor to PGND at least 10 times the VREF capacitor. |
| 15 | LINEUV | input | Line undervoltage monitor input with a 1.27-V threshold and hysteresis set by an internal current source programmed by RDEL. |
| 16 | VIN | power_in | Connects to the input power rail to supply the internal high-voltage startup JFET, rated for a 110-V maximum input (absolute max 120 V). |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | Texas Instruments |
| Package | TSSOP-16 |
| Category | Power Management (PMIC) |
| Pins | 16 |
CAD (KiCad official)
- Symbol:
UCC2891PWR - Footprint:
Package_SO:TSSOP-16_4.4x5mm_P0.65mm - 3D model: TSSOP-16 (KiCad packages3D, STEP)
- 3D model files:
ucc2891pwr-etched.step/ucc2891pwr-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);ucc2891pwr.step/ucc2891pwr.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: Texas Instruments datasheet (41 pp, sha256
0b123b68deef52c5, retrieved 2026-10-11, tier: manufacturer) - Extractor: parts-factory
2.0.0/extract_pins 0.3, primaryclaude-haiku-5-5(text), consensusclaude-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).