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UC3843BD1 - STMicroelectronics

Description: High performance current mode PWM controller

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UC3843BD1 - STMicroelectronics - PCB symbol
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UC3843BD1 - STMicroelectronics PCB footprint - Small Outline Packages - Small Outline Packages - 8-Pin SO_
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UC3843BD1 - STMicroelectronics - 3D model - Small Outline Packages - 8-Pin SO_
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UC3843BD1 Details

  • Manufacturer Part Number:

    UC3843BD1

  • Brand Name:

    STMicroelectronics

  • Rohs Code:

    Yes

  • Part Life Cycle Code:

    Active

  • Part Package Code:

    SOIC

  • Package Description:

    SOP, SOP8,.25

  • Pin Count:

    8

  • Reach Compliance Code:

    Compliant

  • Country Of Origin:

    Morocco

  • ECCN Code:

    EAR99

  • HTS Code:

    8542.39.00.60

  • Factory Lead Time:

    14 Weeks

  • Manufacturer:

    STMicroelectronics

  • YTEOL:

    7

  • Analog IC - Other Type:

    SWITCHING CONTROLLER

  • Control Mode:

    CURRENT-MODE

  • Control Technique:

    PULSE WIDTH MODULATION

  • Input Voltage-Max:

    30 V

  • Input Voltage-Min:

    8.2 V

  • Input Voltage-Nom:

    15 V

  • JESD-30 Code:

    R-PDSO-G8

  • JESD-609 Code:

    e3

  • Length:

    4.9 mm

  • Moisture Sensitivity Level:

    1

  • 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:

    SOP

  • Package Equivalence Code:

    SOP8,.25

  • Package Shape:

    RECTANGULAR

  • Package Style:

    SMALL OUTLINE

  • Peak Reflow Temperature (Cel):

    260

  • Qualification Status:

    Not Qualified

  • Seated Height-Max:

    1.75 mm

  • Surface Mount:

    YES

  • Switcher Configuration:

    SINGLE

  • Switching Frequency-Max:

    500 kHz

  • Technology:

    BIPOLAR

  • Temperature Grade:

    COMMERCIAL

  • Terminal Finish:

    Matte Tin (Sn) - annealed

  • Terminal Form:

    GULL WING

  • Terminal Pitch:

    1.27 mm

  • Terminal Position:

    DUAL

  • Time@Peak Reflow Temperature-Max (s):

    30

  • Width:

    3.9 mm

UC3843BD1 Frequently Asked Questions (FAQs)

  • The recommended operating voltage range for the UC3843BD1 is 12V to 28V, with a maximum voltage rating of 30V.
  • The choice of resistor values for the oscillator circuit depends on the desired switching frequency. A higher resistance value will result in a lower switching frequency, while a lower resistance value will result in a higher switching frequency. A good starting point is to use a 2.2kΩ resistor for a 50kHz switching frequency.
  • The soft-start pin (SS) is used to gradually increase the output voltage of the converter during startup, reducing inrush current and electromagnetic interference (EMI). To use the soft-start pin, 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 around 10nF to 100nF, and the resistor value should be around 1kΩ to 10kΩ.
  • To compensate for the voltage drop across the current sense resistor (RSENSE), you can add a voltage offset to the current sense signal. This can be done by adding a voltage source in series with the current sense resistor, or by using an op-amp to amplify the current sense signal.
  • The maximum current rating of the UC3843BD1 is 1A, but this can be increased by using an external transistor or MOSFET to boost the current capability.

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UC3843BD1 Overview

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About STMicroelectronics

STMicroelectronics (ST) is a global semiconductor company that designs, manufactures, and markets a broad range of integrated circuits (ICs), discrete devices, and other electronic components. STMicroelectronics offers a diverse portfolio of semiconductor products covering a wide range of applications and industries. Their product categories include microcontrollers, analog and mixed-signal ICs, MEMS (Micro-Electro-Mechanical Systems) sensors, power management ICs, RF (Radio Frequency) transceivers, aut

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