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Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) - PFC (Power Factor Correction) > UC2855ADWTR
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UC2855ADWTR

Manufacturer Part Number:
UC2855ADWTR
Manufacturer / Brand
Texas Instruments
Part of Description:
IC PFC CTR AVERAGE 500KHZ 20SOIC
Datasheets:
UC2855ADWTR.pdf
Lead Free Status / RoHS Status:
ROHS3 Compliant
Stock Condition:
New original, 3960 pcs Stock Available.
ECAD Model:
Ship From:
Hong Kong
Shipment Way:
DHL/Fedex/TNT/UPS

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Part Number UC2855ADWTR
Manufacturer / Brand Texas Instruments
Stock Quantity 3960 pcs Stock
Category Integrated Circuits (ICs) > Power Management (PMIC) - PFC (Power Factor Correction)
Description IC PFC CTR AVERAGE 500KHZ 20SOIC
Lead Free Status / RoHS Status: ROHS3 Compliant
RFQ UC2855ADWTR Datasheets UC2855ADWTR Details PDF
UC2855ADWTR Details PDF for FR.pdf
UC2855ADWTR Details PDF for KR.pdf
UC2855ADWTR Details PDF for IT.pdf
UC2855ADWTR Details PDF for ES.pdf
UC2855ADWTR Details PDF for DE.pdf
Voltage - Supply 15.5V ~ 20V
Supplier Device Package 20-SOIC
Series -
Package / Case 20-SOIC (0.295', 7.50mm Width)
Package Tape & Reel (TR)
Operating Temperature -40°C ~ 85°C
Mounting Type Surface Mount
Mode Average Current
Frequency - Switching 500kHz
Current - Startup 150 µA
Base Product Number UC2855

Packaging & ESD

Industry-standard static shielding packaging is used for electronic components.Anti-static, light-transparent materials allow easy identification of ICs and PCB assemblies.
The packaging structure provides electrostatic protection based on Faraday cage principles.This helps protect sensitive components from static discharge during handling and transportation.


All products are packed in ESD-safe anti-static packaging. Outer packaging labels include part number, brand, and quantity for clear identification. Goods are inspected prior to shipment to ensure proper condition and authenticity.

ESD protection is maintained throughout packing, handling, and global transportation. Secure packaging provides reliable sealing and resistance during transit. Additional cushioning materials are applied when required to protect sensitive components.

QC(Part Testing by IC Components)Quality Warranty

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2). Use our account for shipment, Shipment charges(Reference DHL/FedEx, Different Countries has different price.)
Shipment charges： (Reference DHL and FedEX)
Weight(KG): 0.00kg-1.00kg Price(USD$) : USD$60.00
Weight(KG): 1.00kg-2.00kg Price(USD$) : USD$80.00
* The price of cost is reference with DHL/FedEx. The detail charges, please contact us. Different country the express charges are different.



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UC2855ADWTR Product Details:

The UC2855ADWTR is a Power Factor Correction (PFC) Integrated Circuit (IC) manufactured by Luminary Micro / Texas Instruments. This device is designed to address the challenges associated with power factor correction in power supply applications.

The UC2855ADWTR is a 20-pin SOIC (Small Outline Integrated Circuit) package, which makes it suitable for surface mount assembly. It operates within a wide temperature range of -40°C to 85°C, ensuring reliable performance in diverse environmental conditions. The IC is also RoHS (Restriction of Hazardous Substances) compliant, indicating its compliance with environmental regulations.

The key features of the UC2855ADWTR include an average current mode control architecture, which operates at a switching frequency of 500kHz. This high switching frequency allows for the use of smaller magnetic components, leading to a more compact and efficient power supply design. The device has a startup current of 150μA, enabling efficient operation even at low input voltages.

The UC2855ADWTR is primarily used in power supply applications that require power factor correction, such as server power supplies, industrial power supplies, and consumer electronics. Its high-performance PFC capabilities help improve the overall efficiency and power quality of these systems.

Regarding compatibility, the UC2855ADWTR is a direct replacement for the UC2855A, which is the base part number. There are no direct equivalent or alternative models available from Luminary Micro / Texas Instruments.

UC2855ADWTR Key Technical Attributes

Manufacturer Part Number: UC2855ADWTR

Manufacturer: Luminary Micro / Texas Instruments

Base Part Number: UC2855A

UC2855ADWTR Packing Size

Type: 20-SOIC

Material: Encapsulation SOP20

Size: 0.295", 7.50mm Width

Pin Configuration: 20 pins

Thermal Characteristics: Operating Temperature -40°C ~ 85°C

Electrical Properties: Voltage - Supply 15.5 V ~ 20 V, Current - Startup 150A, Frequency - Switching 500kHz

UC2855ADWTR Application

The UC2855ADWTR is designed for use in high-efficiency Power Factor Correction (PFC) applications within telecommunications, industrial systems, and consumer electronics. It supports average current mode for enhanced performance.

UC2855ADWTR Features

The UC2855ADWTR IC incorporates features aimed at optimizing power efficiency and performance. It operates at a switching frequency of 500kHz which allows for smaller component sizes, reducing overall footprint and cost. The supply voltage ranges from 15.5 V to 20 V, facilitating flexibility in different power setups. Its average current mode control helps in minimizing power losses and improving output voltage stability, critical in high-performance power supply systems.

UC2855ADWTR Quality and Safety Features

The device is ROHS compliant signifying it is lead-free, making it environmentally friendly. It also has a Moisture Sensitivity Level rating of MSL 2, ensuring durability for up to 1 year under normal environmental conditions.

UC2855ADWTR Compatibility

This product is suitable to be integrated with various other components and systems needing efficient power factor correction. Its surface mount package type allows for streamlined PCB design and manufacturing.

UC2855ADWTR Datasheet PDF

We highly recommend downloading the most authoritative and detailed datasheet for UC2855ADWTR directly from our website. This will ensure you have all the technical specifications and application guidance needed for effective utilization of this IC.

Quality Distributor

IC-Components is a premium distributor for Luminary Micro / Texas Instruments products. We guarantee quality components with efficient customer service. For detailed specifications and competitive quotes for UC2855ADWTR, visit our website and ensure you are sourcing from a trusted partner in the electronics component industry.

Frequently Asked Questions

What are the primary considerations for interfacing the UC2855ADWTR with different AC input voltage ranges in a power factor correction (PFC) design, especially concerning the DC bus voltage regulation?
When designing with the UC2855ADWTR, careful attention must be paid to the selectable input voltage range options. The device's internal circuitry and external component selection, particularly the current sense resistor and the boost inductor, need to be appropriately scaled for the expected AC input voltages (e.g., 85-265 VAC). Failure to do so can lead to over-current conditions, inefficient operation, or inability to achieve the desired DC bus voltage regulation across the entire input range. The UC2855ADWTR's operating voltage for the IC itself is 15.5V to 20V, which is distinct from the AC input range it can condition.
How does the UC2855ADWTR's 500kHz switching frequency impact component selection for the boost converter, particularly regarding inductor saturation and capacitor ripple current?
The 500kHz switching frequency of the UC2855ADWTR allows for smaller passive components compared to lower frequency PFC controllers. However, this higher frequency increases the peak inductor current and RMS ripple current in the output capacitor. Engineers must select inductors with sufficient saturation current rating to handle the peak currents and ensure the inductor core losses are manageable at 500kHz. Similarly, the output capacitors must have a low Equivalent Series Resistance (ESR) to handle the increased ripple current without excessive heating, which is a critical reliability consideration for the UC2855ADWTR in long-term industrial applications.
What are the potential challenges and mitigation strategies when considering the UC2855ADWTR for replacing older PFC solutions, such as those using UC3854 or similar parts, in terms of layout, component count, and performance?
Replacing an older PFC controller like the UC3854 with the UC2855ADWTR can offer advantages in terms of efficiency and integration. However, engineers must account for differences in control loop compensation, pin assignments, and required external components. Layout is paramount; the UC2855ADWTR's high switching frequency necessitates careful attention to trace impedance, parasitic inductance, and decoupling capacitor placement to minimize EMI and ensure stable operation. The "Average Current" mode control of the UC2855ADWTR also differs from current mode control, requiring a different approach to loop tuning. A thorough re-design of the compensation network and validation of transient response are essential.
Under what conditions might the UC2855ADWTR's specified operating temperature range of -40°C to 85°C become a limiting factor in an industrial environment, and what are the implications for product reliability?
While the UC2855ADWTR is rated for -40°C to 85°C, sustained operation at the upper limit (85°C) can significantly impact the long-term reliability of the IC and surrounding components, especially if there's insufficient heatsinking or airflow within the enclosure. High ambient temperatures combined with the self-heating of the UC2855ADWTR during operation can accelerate component aging and potentially lead to premature failure. Engineers designing for harsh industrial environments should perform thermal simulations and consider active cooling or derating strategies for the UC2855ADWTR to ensure extended operational life.
What are the key considerations for implementing an over-voltage protection (OVP) circuit when using the UC2855ADWTR to protect downstream components from potential DC bus voltage spikes?
The UC2855ADWTR is an average current mode PFC controller, and robust over-voltage protection is critical. While the UC2855ADWTR may have some internal protection, it is typically insufficient for protecting sensitive downstream loads. Engineers must design an external OVP circuit, often involving a comparator and a control mechanism to disable the PFC stage or signal a fault. This might involve monitoring the DC bus voltage with a dedicated sense resistor network and ensuring the UC2855ADWTR's feedback loop is effectively overridden during an over-voltage event.
Given the "Startup Current" specification of 150A for the UC2855ADWTR, how does this relate to inrush current management in AC power systems, and what external components are recommended for limiting it?
The "Startup Current" specification of 150A for the UC2855ADWTR refers to the peak current capability of the internal power MOSFETs or the maximum current the control loop is designed to handle during the initial charge-up of the output capacitor. It does not directly represent the AC inrush current drawn from the mains. To manage AC inrush current, which can be much higher and potentially damage rectifiers or trip circuit breakers, engineers typically employ a soft-start circuit using an NTC thermistor or a controlled charging resistor in series with the AC input, before the PFC stage controlled by the UC2855ADWTR.
For designs requiring higher power levels than what a single UC2855ADWTR can handle, what are the best practices for paralleling the device or migrating to a multi-phase solution, and what are the specific challenges associated with each?
Paralleling the UC2855ADWTR is generally not a recommended approach due to the complexities of current sharing and control loop matching between multiple ICs. A more robust solution for higher power is to use a multi-phase interleaved PFC topology. This involves using multiple UC2855ADWTR controllers, each driving its own PFC stage, with their switching actions interleaved to reduce input current ripple and stress on components. Key challenges include precise timing of the interleaving pulses, load balancing, and ensuring adequate decoupling for each UC2855ADWTR. Alternatively, migrating to a higher-power dedicated PFC controller IC might be a more straightforward path.
What is the typical impact of the UC2855ADWTR's MSL 2 rating (1 Year) on inventory management and shelf-life considerations for boards incorporating this component in a production environment?
The Moisture Sensitivity Level (MSL) 2 rating for the UC2855ADWTR indicates that it is sensitive to moisture and can absorb ambient humidity over time. The "1 Year" designation signifies the recommended shelf life in a dry environment (typically <30% RH). This means that manufacturers need to implement strict inventory management practices, including first-in, first-out (FIFO) stock rotation, and potentially bake the components if they exceed their recommended floor life or storage conditions before reflow soldering. Failing to do so can lead to popcorn effects or delamination during the reflow process, compromising the reliability of the UC2855ADWTR in the final product.
How does the UC2855ADWTR's average current mode control influence the design of the input current shaping loop, and what are the potential trade-offs compared to peak current mode or voltage mode control in terms of transient response and harmonic distortion?
The average current mode control of the UC2855ADWTR is specifically designed to achieve a sinusoidal input current in phase with the voltage, directly targeting power factor correction. This method generally results in excellent input current shaping and lower Total Harmonic Distortion (THD). However, compared to peak current mode control, the transient response to load changes might be slightly slower if not properly compensated, as it relies on sensing the average current over a switching cycle. Voltage mode control, while simpler, typically offers poorer input current shaping and is more susceptible to line voltage variations without extensive compensation. The UC2855ADWTR's approach prioritizes input power quality.
What are the recommended procedures and common pitfalls to avoid when performing high-voltage testing and compliance certification for power supplies utilizing the UC2855ADWTR, particularly concerning creepage and clearance distances?
When testing power supplies incorporating the UC2855ADWTR, especially for safety compliance (e.g., IEC 60950, IEC 62368), careful attention must be paid to creepage and clearance distances between high-voltage and low-voltage sections on the PCB and within the enclosure. The UC2855ADWTR operates with AC mains input, necessitating adequate spacing to prevent arcing and ensure safety. Common pitfalls include inadequate consideration of component placement and PCB routing, insufficient conformal coating where necessary, and overlooking the voltage rating of external components. Always refer to the relevant safety standards and the UC2855ADWTR's datasheet for specific recommendations on spacing.

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UC2855ADWTR

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IC PFC CTR AVERAGE 500KHZ 20SOIC

In Stock: 3960

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