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UC3845D - Texas Instruments

Description: Texas Instruments UC3845D, PWM Current Mode Controller, 1 A, 500 kHz 14-Pin SOIC

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UC3845D - Texas Instruments PCB footprint - Small Outline Packages - Small Outline Packages - D
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UC3845D Details

  • Manufacturer Part Number:

    UC3845D

  • 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

UC3845D Frequently Asked Questions (FAQs)

  • The maximum voltage rating of the UC3845D is 30V, but it's recommended to operate it at a maximum voltage of 25V to ensure reliable operation.
  • The oscillator circuit resistor values (Rt and Ct) depend on the desired switching frequency. A good starting point is to use the values recommended in the datasheet, and then adjust them based on the specific application requirements.
  • The soft-start pin (SS) is used to gradually increase the output voltage during startup, reducing inrush currents and electromagnetic interference (EMI). Connect a capacitor from the SS pin to ground, and the IC will slowly ramp up the output voltage during startup.
  • Ensure good thermal design and heat dissipation by providing adequate heat sinking, using a thermally conductive material, and keeping the IC away from heat sources. Monitor the junction temperature (TJ) and ensure it stays within the recommended range of -40°C to 125°C.
  • Keep the power stage components (e.g., FETs, diodes, and inductors) close together to minimize parasitic inductance and capacitance. Use a solid ground plane, and ensure the feedback traces are short and shielded to minimize noise coupling.

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UC3845D 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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