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UC3843AD - Texas Instruments

Description: TEXAS INSTRUMENTS - UC3843AD . - PWM Controller, 30V-7.6V supply, 500 kHz, 13.5V/1A out, SOIC-14

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UC3843AD - Texas Instruments - PCB symbol
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UC3843AD - Texas Instruments PCB footprint - Small Outline Packages - Small Outline Packages - D
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UC3843AD Details

  • Manufacturer Part Number:

    UC3843AD

  • 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-Max:

    5.1 V

  • Output Voltage-Min:

    4.9 V

  • Output Voltage-Nom:

    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

  • Supply Voltage-Nom (Vsup):

    11 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

UC3843AD Frequently Asked Questions (FAQs)

  • The maximum operating frequency of UC3843AD is 500 kHz. However, it's recommended to operate it at a frequency between 100 kHz to 400 kHz for optimal performance.
  • The minimum input voltage is typically 8.5V, and the maximum input voltage is 35V. However, it's recommended to operate it within 12V to 25V for optimal performance. You can use the formula: Vin(min) = 8.5V + (Vout / Rfb) and Vin(max) = 35V - (Vout / Rfb) to calculate the minimum and maximum input voltage, where Rfb is the feedback resistor value.
  • The soft-start pin (SS) is used to slowly ramp up the output voltage during startup, preventing inrush currents and reducing electromagnetic interference (EMI). It's recommended to connect a capacitor (typically 10nF to 100nF) between the SS pin and ground to set the soft-start time.
  • The feedback resistors (Rfb) and (Rin) are used to set the output voltage. A good starting point is to use Rfb = 2.2kΩ and Rin = 1kΩ. You can adjust these values based on your specific application requirements. A higher Rfb value will result in a higher output voltage, while a higher Rin value will result in a lower output voltage.
  • The undervoltage lockout (UVLO) is a feature that prevents the IC from operating when the input voltage is below a certain threshold (typically 8.5V). This ensures that the IC operates within its specified voltage range and prevents damage or malfunction.

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UC3843AD 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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UC3843AD Alternates

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Part Image UC3843ADTR Texas Instruments

Switching Controller, Current-mode, 1A, 500kHz Switching Freq-Max, BIPolar, PDSO14