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UC3843DTR - Texas Instruments

Description: Current-Mode PWM Controller

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UC3843DTR - Texas Instruments - PCB symbol
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PCB Footprints
UC3843DTR - Texas Instruments PCB footprint - Small Outline Packages - Small Outline Packages - D (-R-PDSO-G14)
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UC3843DTR - Texas Instruments - 3D model - Small Outline Packages - D (-R-PDSO-G14)
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UC3843DTR Details

  • Manufacturer Part Number:

    UC3843DTR

  • 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:

    8.2 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):

    8.4 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

UC3843DTR Frequently Asked Questions (FAQs)

  • The recommended operating voltage range for the UC3843DTR is 12V to 40V, although it can operate up to 42V with some degradation in performance.
  • The oscillator circuit resistor values (Rt and Ct) should be chosen based on the desired switching frequency and the specific application requirements. A good starting point is to use the values recommended in the datasheet, and then adjust them as needed to achieve the desired performance.
  • The soft-start pin (SS) is used to slowly ramp up the output voltage during startup, reducing inrush currents and electromagnetic interference (EMI). To use it, connect a capacitor from the SS pin to ground, and a resistor from the SS pin to the output voltage. The capacitor value should be chosen based on the desired soft-start time.
  • To ensure stability and prevent oscillations, make sure to follow the layout guidelines in the datasheet, use a low-ESR output capacitor, and add a small capacitor (e.g., 10nF) between the Vcc pin and ground. Additionally, ensure that the input voltage is well-regulated and the output voltage is properly filtered.
  • The UC3843DTR can handle output currents up to 1A, but the actual current limit depends on the specific application and the thermal design of the system. Be sure to check the thermal performance and adjust the design accordingly.

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UC3843DTR 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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