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UC3861DW - Texas Instruments

Description: Resonant-Mode Power Supply Controllers

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UC3861DW - Texas Instruments - PCB symbol
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PCB Footprints
UC3861DW - Texas Instruments PCB footprint - Small Outline Packages - Small Outline Packages - DW (R-PDSO-G16)
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3D Models
UC3861DW - Texas Instruments - 3D model - Small Outline Packages - DW (R-PDSO-G16)
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UC3861DW Details

  • Manufacturer Part Number:

    UC3861DW

  • Brand Name:

    Texas Instruments

  • Pbfree Code:

    Yes

  • Rohs Code:

    Yes

  • Part Life Cycle Code:

    Active

  • ECCN Code:

    EAR99

  • HTS Code:

    8542.39.00.90

  • Manufacturer:

    Texas Instruments

  • YTEOL:

    15

  • Analog IC - Other Type:

    SWITCHING CONTROLLER

  • Control Mode:

    VOLTAGE-MODE

  • Control Technique:

    RESONANT CONTROL

  • Input Voltage-Max:

    22 V

  • Input Voltage-Min:

    11.5 V

  • Input Voltage-Nom:

    12 V

  • JESD-30 Code:

    R-PDSO-G16

  • JESD-609 Code:

    e4

  • Length:

    10.3 mm

  • Moisture Sensitivity Level:

    2

  • Number of Functions:

    1

  • Number of Terminals:

    16

  • Operating Temperature-Max:

    70 °C

  • Output Current-Max:

    1.5 A

  • Output Voltage-Max:

    5.2 V

  • Output Voltage-Min:

    4.8 V

  • Output Voltage-Nom:

    5 V

  • Package Body Material:

    PLASTIC/EPOXY

  • Package Code:

    SOP

  • Package Equivalence Code:

    SOP16,.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):

    32 mA

  • Supply Voltage-Max (Vsup):

    22 V

  • Supply Voltage-Min (Vsup):

    16.5 V

  • Supply Voltage-Nom (Vsup):

    12 V

  • Surface Mount:

    YES

  • Switcher Configuration:

    PUSH-PULL

  • 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

UC3861DW Frequently Asked Questions (FAQs)

  • The UC3861DW is a high-frequency device and requires careful layout and placement to ensure proper operation. TI recommends placing the device close to the input capacitors, using short traces, and avoiding vias under the device. A good layout practice is to use a star-ground configuration and to keep the high-current paths separate from the low-current paths.
  • The transformer selection depends on the input voltage, output voltage, and power rating of the application. TI recommends using a transformer with a turns ratio that matches the input and output voltage requirements. The transformer should also have a low leakage inductance and a high magnetizing inductance to ensure proper operation.
  • The maximum duty cycle of the UC3861DW is typically around 50%, but it can be adjusted depending on the application requirements. However, it's recommended to keep the duty cycle below 50% to ensure proper operation and to prevent overheating.
  • The voltage drop across the output rectifier diode can be compensated by adding a voltage offset to the output voltage feedback loop. This can be done by adding a resistor divider network between the output voltage and the feedback pin, or by using a voltage reference IC to generate a voltage offset.
  • The recommended input capacitor value and type depend on the input voltage and frequency of the application. TI recommends using a low-ESR ceramic capacitor with a value of 10uF to 22uF for most applications. The capacitor should be placed close to the input pins of the UC3861DW to minimize noise and ripple.

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UC3861DW 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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