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UC3845N - Texas Instruments

Description: CURRENT MODE PWM CONTROLLER

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UC3845N - Texas Instruments PCB footprint - Dual-In-Line Packages - Dual-In-Line Packages - PDIP-P-8
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UC3845N - Texas Instruments  - 3D model - Dual-In-Line Packages - PDIP-P-8
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UC3845N Details

  • Manufacturer Part Number:

    UC3845N

  • Brand Name:

    Texas Instruments

  • Pbfree Code:

    Yes

  • Rohs Code:

    Yes

  • Part Life Cycle Code:

    Active

  • Part Package Code:

    DIP

  • Pin Count:

    8

  • Country Of Origin:

    Mexico

  • ECCN Code:

    EAR99

  • HTS Code:

    8542.39.00.90

  • Manufacturer:

    Texas Instruments

  • YTEOL:

    4

  • 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-PDIP-T8

  • JESD-609 Code:

    e4

  • Length:

    9.59 mm

  • Number of Functions:

    1

  • Number of Terminals:

    8

  • Operating Temperature-Max:

    70 °C

  • Output Current-Max:

    1 A

  • Output Voltage-Nom:

    5 V

  • 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:

    5.08 mm

  • Supply Current-Max (Isup):

    25 mA

  • Supply Voltage-Max (Vsup):

    28 V

  • Supply Voltage-Min (Vsup):

    8.4 V

  • Surface Mount:

    NO

  • Switcher Configuration:

    BUCK-BOOST

  • Switching Frequency-Max:

    500 kHz

  • Technology:

    BICMOS

  • Temperature Grade:

    COMMERCIAL

  • Terminal Finish:

    Nickel/Palladium/Gold (Ni/Pd/Au)

  • Terminal Form:

    THROUGH-HOLE

  • Terminal Pitch:

    2.54 mm

  • Terminal Position:

    DUAL

  • Width:

    7.62 mm

UC3845N Frequently Asked Questions (FAQs)

  • The maximum voltage rating of the UC3845N is 30V. However, it's recommended to operate it within 15V to ensure reliable operation.
  • The frequency of the UC3845N can be calculated using the formula: f = 1.44 / (RT * CT), where RT is the resistance of the timing resistor and CT is the capacitance of the timing capacitor.
  • The soft-start pin (SS) is used to slowly ramp up the output voltage during startup, reducing inrush currents and preventing voltage spikes. It can be connected to a capacitor to ground to set the soft-start time.
  • The UC3845N's voltage feedback loop can be compensated using a type II compensator, which consists of a series resistor and capacitor connected between the output of the error amplifier and the inverting input of the comparator.
  • The maximum duty cycle of the UC3845N is 99%. However, it's recommended to operate it within 90% to ensure reliable operation and prevent overheating.

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UC3845N 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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