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UC3843BNG - onsemi

Description: Latching PWM for Cycle-By-Cycle Current Limiting; Oscillator Frequency Guaranteed at 250 kHz; Low Startup and Operating Current; Trimmed Oscillator for Precise Frequency Control; Internally Trimmed Reference with Undervoltage Lockout; Undervoltage Lockout with Hysteresis; Automatic Feed Forward Compensation; High Current Totem Pole Output; Current Mode Operation to 500 kHz; Pb-Free Packages are Available

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UC3843BNG - onsemi PCB footprint - Dual-In-Line Packages - Dual-In-Line Packages - PDIP−8_2020-3
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UC3843BNG - onsemi  - 3D model - Dual-In-Line Packages - PDIP−8_2020-3
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UC3843BNG Details

  • Manufacturer Part Number:

    UC3843BNG

  • Brand Name:

    onsemi

  • Pbfree Code:

    Yes

  • Rohs Code:

    Yes

  • Part Life Cycle Code:

    Active

  • Part Package Code:

    8 LEAD PDIP

  • Package Description:

    PDIP-8

  • Pin Count:

    8

  • Manufacturer Package Code:

    626-05

  • Country Of Origin:

    Mainland China

  • ECCN Code:

    EAR99

  • HTS Code:

    8542.39.00.60

  • Manufacturer:

    onsemi

  • YTEOL:

    6

  • Analog IC - Other Type:

    SWITCHING CONTROLLER

  • Control Mode:

    CURRENT-MODE

  • Control Technique:

    PULSE WIDTH MODULATION

  • Input Voltage-Max:

    25 V

  • Input Voltage-Min:

    12 V

  • Input Voltage-Nom:

    15 V

  • JESD-30 Code:

    R-PDIP-T8

  • JESD-609 Code:

    e3

  • Length:

    9.78 mm

  • Number of Functions:

    1

  • Number of Terminals:

    8

  • Operating Temperature-Max:

    70 °C

  • Output Current-Max:

    1 A

  • 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:

    4.45 mm

  • Surface Mount:

    NO

  • Switcher Configuration:

    BUCK-BOOST

  • Switching Frequency-Max:

    500 kHz

  • Technology:

    BIPOLAR

  • Temperature Grade:

    COMMERCIAL

  • Terminal Finish:

    Matte Tin (Sn) - annealed

  • Terminal Form:

    THROUGH-HOLE

  • Terminal Pitch:

    2.54 mm

  • Terminal Position:

    DUAL

  • Width:

    7.62 mm

UC3843BNG Frequently Asked Questions (FAQs)

  • The recommended operating voltage range for the UC3843BNG is 12V to 28V, with a maximum rating of 30V.
  • To ensure stability, it's essential to follow the recommended layout guidelines, use a suitable output capacitor, and add a compensation network (e.g., RC network) to the feedback loop.
  • The soft-start pin (SS) is used to gradually ramp up the output voltage during startup, reducing inrush currents and preventing output voltage overshoot.
  • Yes, the UC3843BNG can be used in isolated topologies like flyback converters, but it requires additional components, such as a transformer and an optocoupler, to provide isolation and feedback.
  • The current sense resistor (RCS) value depends on the desired overcurrent protection threshold and the maximum expected output current. A general guideline is to choose an RCS value that sets the overcurrent threshold to 1.5 to 2 times the maximum expected output current.

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UC3843BNG Overview

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