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UC3842DTR - Texas Instruments

Description: AC to DC Switching Converter Off-Line Switcher 17.5V 500kHz T/R 14-Pin SOIC

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UC3842DTR - Texas Instruments - PCB symbol
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PCB Footprints
UC3842DTR - Texas Instruments PCB footprint - Small Outline Packages - Small Outline Packages - D (-R-PDSO-G14)
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UC3842DTR - Texas Instruments - 3D model - Small Outline Packages - D (-R-PDSO-G14)
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UC3842DTR Details

  • Manufacturer Part Number:

    UC3842DTR

  • Brand Name:

    Texas Instruments

  • Pbfree Code:

    Yes

  • Rohs Code:

    Yes

  • Part Life Cycle Code:

    Active

  • Part Package Code:

    SOIC

  • Pin Count:

    14

  • Country Of Origin:

    Mexico

  • ECCN Code:

    EAR99

  • HTS Code:

    8542.39.00.90

  • Manufacturer:

    Texas Instruments

  • YTEOL:

    15

  • Analog IC - Other Type:

    SWITCHING CONTROLLER

  • Control Mode:

    CURRENT-MODE

  • Control Technique:

    PULSE WIDTH MODULATION

  • Input Voltage-Max:

    28 V

  • Input Voltage-Min:

    11.5 V

  • Input Voltage-Nom:

    15 V

  • JESD-30 Code:

    R-PDSO-G14

  • JESD-609 Code:

    e4

  • Length:

    8.65 mm

  • Moisture Sensitivity Level:

    1

  • Number of Functions:

    1

  • Number of Terminals:

    14

  • Operating Temperature-Max:

    70 °C

  • Output Current-Max:

    1 A

  • Output Voltage-Nom:

    2.5 V

  • Package Body Material:

    PLASTIC/EPOXY

  • Package Code:

    SOP

  • Package Equivalence Code:

    SOP14,.25

  • Package Shape:

    RECTANGULAR

  • Package Style:

    SMALL OUTLINE

  • Peak Reflow Temperature (Cel):

    260

  • Qualification Status:

    Not Qualified

  • Seated Height-Max:

    1.75 mm

  • Supply Current-Max (Isup):

    25 mA

  • Supply Voltage-Max (Vsup):

    28 V

  • Supply Voltage-Min (Vsup):

    16 V

  • Surface Mount:

    YES

  • Switcher Configuration:

    BUCK-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:

    3.9 mm

UC3842DTR Frequently Asked Questions (FAQs)

  • The maximum operating frequency of UC3842DTR is 500 kHz, but it can be extended up to 1 MHz with proper design and layout considerations.
  • The minimum input voltage is typically 8V, and the maximum input voltage is 40V. However, the recommended operating range is 12V to 35V. You can calculate the minimum and maximum input voltage based on your specific application requirements and the voltage regulator's dropout voltage.
  • The soft-start pin (SS) is used to control the output voltage rise time during startup. By connecting a capacitor from the SS pin to ground, you can slow down the output voltage rise time, reducing inrush current and electromagnetic interference (EMI).
  • The current sense resistor (Rcs) value depends on the maximum output current and the desired current limit. A general rule of thumb is to choose an Rcs value that sets the current limit to 1.5 to 2 times the maximum output current. You can use the formula Rcs = 0.65V / Imax to calculate the Rcs value, where Imax is the maximum output current.
  • The undervoltage lockout (UVLO) feature is used to prevent the IC from operating when the input voltage is below a certain threshold (typically 7.9V). This feature helps to prevent the IC from malfunctioning or drawing excessive current when the input voltage is low.

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UC3842DTR 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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