UC2854ADWTR Texas Instruments Integrated Circuit (Small Outline Packages) In Stock
The UC2854ADWTR is an enhanced high power factor preregulator IC from Texas Instruments that implements average current-mode PWM control to achieve near-unity power factor correction in AC-DC power supplies, operating from 10-20V bias in a 16-pin SOIC package. It provides integrated boost PFC control with multiplier, error amplifier, and gate drive functions. Available in tape-and-reel from authorized distributors with worldwide shipping.
- Manufacturer
- Texas Instruments
- Package
- Small Outline Packages
- Pin Count
- 16
- Lifecycle
- ACTIVE
- Datasheet
- UC2854ADWTR Datasheet PDF
- Category
- Integrated Circuit
- Temp Range
- -40.0°C to 85.0°C
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
Key Features
- Average current-mode PWM control achieves near-unity power factor correction, minimizing AC line harmonic distortion to meet IEC 61000-3-2 standards
- Integrated analog multiplier, voltage error amplifier, and current amplifier reduce external component count in boost PFC preregulator designs
- 10V to 20V bias supply range (nominal 18V) suits auxiliary rail operation in offline AC-DC power conversion systems
- 16-pin SOIC (R-PDSO-G16) tape-and-reel packaging supports high-volume automated assembly in industrial and consumer power supply production
Applications
The UC2854ADWTR is the core control IC in active power factor correction front-end stages for offline AC-DC power supplies used in computers, industrial motor drives, telecommunications rectifiers, and medical power equipment. Its average current-mode boost PFC architecture shapes the AC input current to follow the sinusoidal line voltage, reducing reactive power and harmonic content to comply with EN61000-3-2 and similar international regulations. It is also used in UPS systems and programmable AC power sources requiring high efficiency and low total harmonic distortion from the AC mains.
Specifications
| Pbfree Code | Yes |
| Date Of Intro | 1992-12-01 |
| YTEOL | 15 |
| Analog IC - Other Type | POWER FACTOR CONTROLLER |
| Control Mode | CURRENT-MODE |
| Control Technique | PULSE WIDTH MODULATION |
| Input Voltage-Max | 20V |
| Input Voltage-Min | 10V |
| Input Voltage-Nom | 18V |
| JESD-30 Code | R-PDSO-G16 |
| JESD-609 Code | e4 |
| Number of Functions | 1 |
| Output Current-Max | 1.5A |
| Output Voltage-Max | 7.6V |
| Output Voltage-Min | 7.4V |
| Output Voltage-Nom | 7.5V |
| Package Body Material | PLASTIC/EPOXY |
| Package Equivalence Code | SOP16,.4 |
| Package Shape | RECTANGULAR |
| Package Style | SMALL OUTLINE |
| Peak Reflow Temperature (Cel) | 260 |
| Qualification Status | Not Qualified |
| Supply Current-Max (Isup) | 12mA |
| Supply Voltage-Max (Vsup) | 20V |
| Supply Voltage-Nom (Vsup) | 18V |
| Surface Mount | YES |
| Switcher Configuration | BOOST |
| Switching Frequency-Max | 200kHz |
| Technology | BIPOLAR |
| Temperature Grade | INDUSTRIAL |
| Terminal Finish | Nickel/Palladium/Gold (Ni/Pd/Au) |
| Terminal Form | GULL WING |
| Terminal Pitch | 1.27mm |
| Terminal Position | DUAL |
| Time@Peak Reflow Temperature-Max (s) | 30 |
| Package | Small Outline Packages |
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
| Moisture Sensitivity Level | MSL 2 |
| ECCN | EAR99 |
| HTS Code | 8542.39.00.90 |
Alternate & Equivalent Parts
Compatible alternatives and drop-in replacements for UC2854ADWTR:
Power Factor Controller, Current-mode, 1.5A, 200kHz Switching Freq-Max, BIPolar, PDSO16
Frequently Asked Questions
What is the primary function of the UC2854ADWTR?
The UC2854ADWTR is a power factor correction (PFC) controller that uses average current-mode PWM control to shape the AC input current of boost PFC preregulator circuits. It forces the input current to track the sinusoidal line voltage waveform, achieving near-unity power factor and reducing harmonic distortion to comply with IEC 61000-3-2 and similar standards.
What control mode does the UC2854ADWTR use and why is it advantageous?
The UC2854ADWTR implements average current-mode PWM control, where the average inductor current is regulated to follow a sinusoidal reference derived from the line voltage. This approach provides inherently lower harmonic distortion, better noise immunity, and more stable control loop dynamics compared to peak current-mode PFC controllers, especially in high-power applications.
What supply voltage does the UC2854ADWTR require?
The UC2854ADWTR requires a bias supply voltage between 10V and 20V, with a nominal operating voltage of 18V. This auxiliary supply is typically derived from the power supply's transformer auxiliary winding or a dedicated bias regulator, making it compatible with standard offline AC-DC converter auxiliary rail designs.
What package and ordering format does the UC2854ADWTR use?
The UC2854ADWTR is packaged in a 16-pin SOIC (JESD-30 code R-PDSO-G16) surface-mount package. The TR suffix indicates tape-and-reel packaging, which is optimized for high-volume automated SMT pick-and-place assembly. It is Pb-free and RoHS compliant with a projected end-of-life year of 2007 from its 1992 introduction date (YTEOL: 15).
What power supply applications is the UC2854ADWTR designed for?
This IC targets the active PFC front-end stage of offline AC-DC power supplies in desktop computers, servers, industrial variable-speed drives, telecom rectifiers, UPS systems, and medical power equipment. Regulatory requirements in these markets mandate active PFC to limit harmonic current injection into the AC grid, making a dedicated PFC controller like the UC2854ADWTR essential for compliance and efficiency.
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About Texas Instruments
Texas Instruments (TI) is a global semiconductor company headquartered in Dallas, Texas. TI designs and manufactures analog and embedded processing chips used in industrial, automotive, consumer, communications, and enterprise systems.
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