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UC3843ANG4 - Texas Instruments

Description: Switching Controllers Current-Mode PWM Controller

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UC3843ANG4 - Texas Instruments - PCB symbol
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PCB Footprints
UC3843ANG4 - Texas Instruments PCB footprint - Dual-In-Line Packages - Dual-In-Line Packages - P (R-PDIP-T8)
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UC3843ANG4 - Texas Instruments - 3D model - Dual-In-Line Packages - P (R-PDIP-T8)
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UC3843ANG4 Details

  • Manufacturer Part Number:

    UC3843ANG4

  • Brand Name:

    Texas Instruments

  • Pbfree Code:

    Yes

  • Rohs Code:

    Yes

  • Part Life Cycle Code:

    Active

  • Part Package Code:

    DIP

  • Pin Count:

    8

  • Country Of Origin:

    Mexico

  • ECCN Code:

    EAR99

  • HTS Code:

    8542.39.00.60

  • 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-PDIP-T8

  • JESD-609 Code:

    e4

  • Length:

    9.81 mm

  • Number of Functions:

    1

  • Number of Terminals:

    8

  • 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:

    DIP

  • Package Equivalence Code:

    DIP8,.3

  • Package Shape:

    RECTANGULAR

  • Package Style:

    IN-LINE

  • Qualification Status:

    Not Qualified

  • Seated Height-Max:

    5.08 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:

    NO

  • Switcher Configuration:

    BUCK-BOOST

  • Switching Frequency-Max:

    500 kHz

  • Technology:

    BIPOLAR

  • Temperature Grade:

    COMMERCIAL

  • Terminal Finish:

    Nickel/Palladium/Gold (Ni/Pd/Au)

  • Terminal Form:

    THROUGH-HOLE

  • Terminal Pitch:

    2.54 mm

  • Terminal Position:

    DUAL

  • Width:

    7.62 mm

UC3843ANG4 Frequently Asked Questions (FAQs)

  • The maximum operating frequency of UC3843ANG4 is 500 kHz, but it can be adjusted using the RT/CT pin. However, it's recommended to operate at a frequency below 400 kHz for optimal performance and to minimize EMI.
  • The output voltage of the UC3843ANG4 is determined by the voltage divider network connected to the VFB pin. The output voltage can be calculated using the formula: Vout = (Vref x (R1 + R2) / R2), where Vref is the internal reference voltage (2.5V) and R1 and R2 are the resistors in the voltage divider network.
  • The soft-start pin (SS) on the UC3843ANG4 is used to slowly ramp up the output voltage during startup, reducing inrush current and preventing voltage overshoots. The SS pin is connected to a capacitor that is charged by an internal current source, and the output voltage is proportional to the voltage on the SS pin.
  • The value of the current sense resistors (RCS) on the UC3843ANG4 depends on the maximum current rating of the power supply and the desired current limit. A good starting point is to choose a value that sets the current limit to 1.5-2 times the maximum output current. The formula to calculate RCS is: RCS = (0.65V / Imax), where Imax is the maximum output current.
  • The undervoltage lockout (UVLO) on the UC3843ANG4 is a feature that prevents the device from operating when the input voltage is below a certain threshold (typically around 8V). This is to prevent the device from malfunctioning or drawing excessive current when the input voltage is low.

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UC3843ANG4 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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