UC3855BDWTRG4 Texas Instruments Integrated Circuit (Small Outline Packages) In Stock
The UC3855BDWTRG4 is a high-performance power factor correction controller IC that implements current-mode PWM control for active PFC preregulator stages in AC-DC power supplies. It operates with an input voltage range of 15 V to 35 V and is housed in a 20-pin SOIC package. Available globally with stock and worldwide distribution.
- Manufacturer
- Texas Instruments
- Package
- Small Outline Packages
- Pin Count
- 20
- Lifecycle
- OBSOLETE
- Datasheet
- UC3855BDWTRG4 Datasheet PDF
- Category
- Integrated Circuit
- Temp Range
- ?°C to 70.0°C
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
What are the key features of UC3855BDWTRG4?
- Current-mode PWM control for accurate and stable power factor correction
- Input voltage operating range of 15 V to 35 V
- High-performance PFC preregulator topology for AC-DC power supplies
- 20-pin SOIC package for standard SMT board assembly
- Integrated gate drive and protection functions reducing external component count
- Designed for continuous-conduction-mode PFC boost converter designs
What is UC3855BDWTRG4 used for?
The UC3855BDWTRG4 is used in AC-DC power supply designs for industrial equipment, server power supplies, and commercial lighting ballasts where active power factor correction is required to comply with IEC 61000-3-2 or EN 61000-3-2 harmonic standards. It is also found in UPS systems and motor drive front-ends where improved input power factor reduces line current and transformer sizing.
What are the specifications of UC3855BDWTRG4?
| 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 |
| Output Voltage-Max | 7.613V |
| Output Voltage-Min | 7.388V |
| Output Voltage-Nom | 7.5V |
| 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 | COMMERCIAL |
| 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 UC3855BDWTRG4 datasheet?
UC3855BDWTRG4 Datasheet DownloadOfficial datasheet from Texas Instruments
What are equivalent replacements for UC3855BDWTRG4?
Compatible alternatives and drop-in replacements for UC3855BDWTRG4:
Power Factor Controller, Current-mode, 1.5A, 500kHz Switching Freq-Max, BIPolar, PDSO20
Rochester Electronics LLC 1.5A POWER FACTOR CONTROLLER, 500kHz SWITCHING FREQ-MAX, PDSO20, GREEN, PLASTIC, SOIC-20
Frequently Asked Questions
What input voltage range does UC3855BDWTRG4 support for PFC controller bias supply?
The UC3855BDWTRG4 operates from a controller bias supply of 15 V to 35 V, with a nominal operating point around 18 V. This range allows the IC bias to be derived from an auxiliary winding on the PFC boost inductor or from a separate low-voltage rail in the power supply design.
Which AC-DC power supply topologies benefit most from the UC3855BDWTRG4?
The UC3855BDWTRG4 is optimized for continuous-conduction-mode (CCM) boost PFC preregulators operating from 85 V to 265 V AC input. Power supply designers in server, industrial UPS, and 400 W to 2 kW telecom rectifier applications use it to achieve power factor above 0.99 and meet IEC 61000-3-2 Class D current harmonic limits.
How does current-mode control in UC3855BDWTRG4 improve PFC stability compared to voltage-mode?
Current-mode PWM control inherently limits the peak inductor current on a cycle-by-cycle basis, providing automatic overcurrent protection and faster inner-loop response. This approach improves line transient rejection and simplifies compensation network design in boost PFC stages operating over a wide input range of 15 V to 35 V bias and variable AC line conditions.
What package does UC3855BDWTRG4 use and what does the G4 suffix indicate for purchasing compliance?
The device comes in a 20-pin SOIC (R-PDSO-G20) package with a 1.27 mm pin pitch, suitable for standard wave or reflow soldering. The G4 suffix in UC3855BDWTRG4 indicates a halogen-free, RoHS-compliant part meeting JESD-609 e4 requirements, which satisfies procurement environmental compliance for EU and Asian markets.
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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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