UC2855ADWG4 Texas Instruments Integrated Circuit (Small Outline Packages) In Stock
The UC2855ADWG4 is a high-performance power factor pre-regulator controller IC from Texas Instruments using current-mode PWM control. It operates from a 15V to 35V supply and supports switching frequencies up to 230kHz for boost PFC stages in a 20-pin SOIC package. Designed for offline power supply designs requiring near-unity power factor and low harmonic distortion.
- Manufacturer
- Texas Instruments
- Package
- Small Outline Packages
- Pin Count
- 20
- Lifecycle
- OBSOLETE
- Datasheet
- UC2855ADWG4 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
What are the key features of UC2855ADWG4?
- Current-mode PWM control with up to 230kHz switching frequency enables compact magnetic designs and fast transient response in boost PFC pre-regulator stages
- Integrated zero-current detection, gate drive output, and overvoltage/overcurrent protection simplify PFC controller circuit design with minimal external components
- Wide VCC supply range (15V–35V) and 20-pin SOIC package (RoHS-compliant, e4) suit both 100VAC and 230VAC universal input offline power supply designs
What is UC2855ADWG4 used for?
The UC2855ADWG4 is used as the primary power factor correction controller in offline AC-DC power supplies for computer power supplies, industrial equipment, and telecommunications infrastructure. Its current-mode average-current control topology achieves power factors above 0.99 and reduces harmonic current distortion to meet IEC 61000-3-2 standards for equipment above 75W. It is also applied in motor drive front-ends and medical power supplies where high efficiency and regulatory compliance for harmonic emissions are required.
What are the specifications of UC2855ADWG4?
| Pbfree Code | Yes |
| YTEOL | 0 |
| Analog IC - Other Type | POWER FACTOR CONTROLLER |
| Control Mode | CURRENT-MODE |
| Control Technique | PULSE WIDTH MODULATION |
| Input Voltage-Max | 35V |
| Input Voltage-Min | 15V |
| Input Voltage-Nom | 18V |
| JESD-30 Code | R-PDSO-G20 |
| JESD-609 Code | e4 |
| Number of Functions | 1 |
| Output Current-Max | 1.5A |
| Package Body Material | PLASTIC/EPOXY |
| Package Equivalence Code | SOP20,.4 |
| Package Shape | RECTANGULAR |
| Package Style | SMALL OUTLINE |
| Peak Reflow Temperature (Cel) | 260 |
| Qualification Status | Not Qualified |
| Supply Current-Max (Isup) | 25mA |
| Supply Voltage-Nom (Vsup) | 18V |
| Surface Mount | YES |
| Switcher Configuration | BOOST |
| Switching Frequency-Max | 500kHz |
| Technology | BIPOLAR |
| Temperature Grade | INDUSTRIAL |
| Terminal Finish | NICKEL PALLADIUM GOLD |
| 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 | 8542.39.00.60 |
Where can I find the UC2855ADWG4 datasheet?
UC2855ADWG4 Datasheet DownloadOfficial datasheet from Texas Instruments
What are equivalent replacements for UC2855ADWG4?
Compatible alternatives and drop-in replacements for UC2855ADWG4:
Power Factor Controller, Current-mode, 1.5A, 500kHz Switching Freq-Max, BIPolar, PDSO20
Frequently Asked Questions
What control method does the UC2855ADWG4 use for power factor correction?
The UC2855ADWG4 uses average current-mode PWM control for power factor correction. In this approach, the inductor current is averaged and forced to follow the rectified AC input voltage waveform, producing a sinusoidal input current in phase with the line voltage. This method achieves high power factor (typically above 0.99) and excellent harmonic distortion performance.
What is the switching frequency capability of the UC2855ADWG4?
The UC2855ADWG4 supports switching frequencies up to 230kHz, allowing designers to use smaller inductors and capacitors in the PFC boost stage. Higher switching frequency also reduces audible noise from magnetic components and improves dynamic response to load transients in high-density power supply designs.
What supply voltage does the UC2855ADWG4 require?
The UC2855ADWG4 requires a VCC supply voltage between 15V and 35V, with a nominal operating voltage of 18V. This supply is typically derived from an auxiliary winding on the PFC boost inductor or a separate bias supply, providing the gate drive and control circuit power independent of the high-voltage PFC bus.
What protection features are integrated into the UC2855ADWG4?
The UC2855ADWG4 integrates several protection functions including overcurrent protection (via current sense input), overvoltage protection on the PFC output bus, and undervoltage lockout (UVLO) to prevent operation below minimum VCC. These features protect both the controller and external power components during fault conditions without requiring additional discrete protection circuits.
What power supply topologies is the UC2855ADWG4 designed for?
The UC2855ADWG4 is specifically designed for continuous conduction mode (CCM) boost PFC pre-regulator topologies used in offline AC-DC power supplies. It is applicable to universal input (85VAC–265VAC) designs with output power ratings typically from 200W to over 1kW. The pre-regulated PFC output feeds a second-stage DC-DC converter such as a phase-shifted full-bridge or LLC resonant converter.
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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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