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UC3845ADTR - Texas Instruments

Description: Current Mode PWM Controller

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UC3845ADTR - Texas Instruments PCB footprint - Small Outline Packages - Small Outline Packages - D (-R-PDSO-G14)
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UC3845ADTR - Texas Instruments  - 3D model - Small Outline Packages - D (-R-PDSO-G14)
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UC3845ADTR Details

  • Manufacturer Part Number:

    UC3845ADTR

  • Brand Name:

    Texas Instruments

  • Pbfree Code:

    Yes

  • Rohs Code:

    Yes

  • Part Life Cycle Code:

    Active

  • Part Package Code:

    SOIC

  • Package Description:

    SOP, SOP14,.25

  • Pin Count:

    14

  • Reach Compliance Code:

    Compliant

  • 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-Max:

    5.1 V

  • Output Voltage-Min:

    4.9 V

  • Output Voltage-Nom:

    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

  • Supply Voltage-Nom (Vsup):

    11 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

UC3845ADTR Frequently Asked Questions (FAQs)

  • The maximum voltage rating for the UC3845ADTR is 30V. However, it's recommended to operate it within 15V to ensure reliable operation and to prevent damage to the internal circuitry.
  • The oscillator circuit requires two resistors, R1 and R2, to set the frequency. A good starting point is to use R1 = 2.2kΩ and R2 = 4.7kΩ for a frequency of around 250kHz. You can adjust these values based on your specific application requirements.
  • The soft-start pin (SS) is used to gradually increase the output voltage during startup, reducing inrush current and preventing voltage overshoots. Connect a capacitor (typically 10nF to 100nF) from the SS pin to ground, and a resistor (typically 1kΩ to 10kΩ) from the SS pin to the output voltage. This will create a soft-start ramp.
  • To ensure stability, make sure to follow the recommended layout guidelines, use a low-ESR output capacitor, and add a compensation network (e.g., a resistor and capacitor) between the output and the feedback pin. Additionally, ensure that the input voltage is well-regulated and decoupled.
  • The UC3845ADTR can drive a maximum output current of 1A. However, this is dependent on the specific application and the external components used. It's essential to check the thermal performance and ensure that the device is not overheating.

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UC3845ADTR 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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