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UC3855ADW - Texas Instruments

Description: High Performance Power Factor Preregulator

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UC3855ADW - Texas Instruments - PCB symbol
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UC3855ADW - Texas Instruments PCB footprint - Small Outline Packages - Small Outline Packages - DW0020A
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UC3855ADW - Texas Instruments - 3D model - Small Outline Packages - DW0020A
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UC3855ADW Details

  • Manufacturer Part Number:

    UC3855ADW

  • 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:

    70 °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:

    COMMERCIAL

  • 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

UC3855ADW Frequently Asked Questions (FAQs)

  • Texas Instruments 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 supply connection are also recommended.
  • The transformer selection depends on the output power, voltage, and current requirements. Texas Instruments provides a transformer design guide and a list of recommended transformers in the UC3855ADW datasheet. Engineers can also use online transformer selection tools or consult with transformer manufacturers.
  • The maximum duty cycle of the UC3855ADW is 50%. Exceeding this limit can cause the controller to malfunction or oscillate. Engineers should ensure that the design operates within the recommended duty cycle range to maintain stability and reliability.
  • The UC3855ADW has a built-in OVP and UVP feature. Engineers can use external resistors and zener diodes to set the OVP and UVP thresholds. The datasheet provides a detailed description of the OVP and UVP implementation.
  • The recommended startup sequence is to apply the input voltage, followed by the enable signal. This sequence ensures that the controller is properly biased and configured before the power FETs are turned on. Improper startup sequencing can cause the controller to malfunction or oscillate.

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UC3855ADW 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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