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UC2855ADW - Texas Instruments

Description: High Performance Power Factor Preregulator

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UC2855ADW - Texas Instruments - PCB symbol
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PCB Footprints
UC2855ADW - Texas Instruments PCB footprint - Small Outline Packages - Small Outline Packages - DW (R-PDSO-G20)
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UC2855ADW - Texas Instruments - 3D model - Small Outline Packages - DW (R-PDSO-G20)
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UC2855ADW Details

  • Manufacturer Part Number:

    UC2855ADW

  • Brand Name:

    Texas Instruments

  • Pbfree Code:

    Yes

  • Rohs Code:

    Yes

  • Part Life Cycle Code:

    Active

  • Part Package Code:

    SOIC

  • Pin Count:

    20

  • ECCN Code:

    EAR99

  • HTS Code:

    8542.39.00.90

  • Date Of Intro:

    1994-01-01

  • Manufacturer:

    Texas Instruments

  • YTEOL:

    15

  • Analog IC - Other Type:

    POWER FACTOR CONTROLLER

  • Control Mode:

    CURRENT-MODE

  • Control Technique:

    PULSE WIDTH MODULATION

  • Input Voltage-Max:

    20 V

  • Input Voltage-Min:

    15 V

  • Input Voltage-Nom:

    18 V

  • JESD-30 Code:

    R-PDSO-G20

  • JESD-609 Code:

    e4

  • Length:

    12.8 mm

  • Moisture Sensitivity Level:

    2

  • Number of Functions:

    1

  • Number of Terminals:

    20

  • Operating Temperature-Max:

    85 °C

  • Operating Temperature-Min:

    -40 °C

  • Output Current-Max:

    1.5 A

  • Package Body Material:

    PLASTIC/EPOXY

  • Package Code:

    SOP

  • Package Equivalence Code:

    SOP20,.4

  • Package Shape:

    RECTANGULAR

  • Package Style:

    SMALL OUTLINE

  • Peak Reflow Temperature (Cel):

    260

  • Qualification Status:

    Not Qualified

  • Seated Height-Max:

    2.65 mm

  • Supply Current-Max (Isup):

    17 mA

  • Supply Voltage-Max (Vsup):

    20 V

  • Surface Mount:

    YES

  • Switcher Configuration:

    BOOST

  • Switching Frequency-Max:

    500 kHz

  • Technology:

    BIPOLAR

  • Temperature Grade:

    INDUSTRIAL

  • Terminal Finish:

    Nickel/Palladium/Gold (Ni/Pd/Au)

  • Terminal Form:

    GULL WING

  • Terminal Pitch:

    1.27 mm

  • Terminal Position:

    DUAL

  • Time@Peak Reflow Temperature-Max (s):

    30

  • Width:

    7.5 mm

UC2855ADW Frequently Asked Questions (FAQs)

  • TI recommends a compact layout with the controller, power FETs, and output capacitors placed close together. The input and output stages should be separated to minimize noise coupling. A solid ground plane and a low-impedance power path are also essential. Refer to the TI application note SLUA121 for more details.
  • The transformer selection depends on the output power, voltage, and current requirements. TI recommends using a transformer with a turns ratio that matches the output voltage and current requirements. The transformer's leakage inductance and magnetizing inductance should also be considered. Refer to the TI application note SLUA122 for transformer selection guidelines.
  • The maximum duty cycle of the UC2855ADW is typically around 90%. Exceeding this limit can cause output voltage regulation issues. To maintain good regulation, ensure that the duty cycle is kept below 90% by adjusting the input voltage, output voltage, or the transformer turns ratio.
  • The UC2855ADW has a built-in overcurrent protection feature that can be enabled by connecting a sense resistor to the CS pin. The sense resistor value should be chosen based on the desired overcurrent threshold. When the current exceeds the threshold, the UC2855ADW will shut down and latch off until the fault is cleared.
  • TI recommends using a low-ESR ceramic or film capacitor with a value of 10uF to 22uF for the input capacitor. The capacitor should be rated for the input voltage and have a low equivalent series resistance (ESR) to minimize voltage ripple and noise.

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UC2855ADW Overview

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About Texas Instruments

Texas Instruments (TI) designs and manufactures semiconductors and integrated circuits for a wide range of applications. The company's product portfolio includes analog chips, which are essential for managing power and signal functions in electronic devices, and embedded processors, which serve as the brains in various systems, enabling functionality in everything from industrial equipment to consumer electronics. TI's innovations in semiconductor technology have made it a leader in the industry.

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For a full list of alternate parts for UC2855ADW, check out Findchips.com