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UC3845DG4 - Texas Instruments

Description: CURRENT MODE PWM CONTROLLER

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UC3845DG4 - Texas Instruments PCB footprint - Other - Other - SOIC127P600X175-14N
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UC3845DG4 - Texas Instruments  - 3D model - Other - SOIC127P600X175-14N
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UC3845DG4 Details

  • Manufacturer Part Number:

    UC3845DG4

  • 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:

    8542.39.00.60

  • 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-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

UC3845DG4 Frequently Asked Questions (FAQs)

  • The maximum voltage rating for the UC3845DG4 is 30V. However, it's recommended to operate it within 15V to ensure reliable operation and to prevent damage to the internal circuitry.
  • The frequency of the oscillator in the UC3845DG4 can be calculated using the formula: f = 1.12 / (Rt * Ct), where Rt is the resistance between the RT pin and ground, and Ct is the capacitance between the CT pin and ground.
  • The soft-start pin (SS) in the UC3845DG4 is used to slowly ramp up the output voltage during startup, reducing the inrush current and preventing damage to the power supply components. It can be connected to a capacitor to ground to set the soft-start time.
  • To compensate for the voltage drop across the current sense resistor, you can add a voltage offset to the current sense threshold voltage (Vcs) by connecting a resistor divider network between the Vcs pin and the output voltage. The offset voltage should be equal to the voltage drop across the current sense resistor.
  • The maximum duty cycle of the UC3845DG4 is 99%. However, it's recommended to operate it at a duty cycle of 95% or less to ensure reliable operation and to prevent overheating.

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UC3845DG4 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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