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UC3856N - Texas Instruments

Description: Texas Instruments UC3856N, PWM Current Mode Controller, Dual 1.5 A, 220 kHz 16-Pin PDIP

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UC3856N - Texas Instruments - PCB symbol
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PCB Footprints
UC3856N - Texas Instruments PCB footprint - Dual-In-Line Packages - Dual-In-Line Packages - N(R-PDIP-T16)
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UC3856N - Texas Instruments - 3D model - Dual-In-Line Packages - N(R-PDIP-T16)
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UC3856N Details

  • Manufacturer Part Number:

    UC3856N

  • Brand Name:

    Texas Instruments

  • Pbfree Code:

    Yes

  • Rohs Code:

    Yes

  • Part Life Cycle Code:

    Not Recommended

  • Part Package Code:

    DIP

  • Pin Count:

    16

  • 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:

    40 V

  • Input Voltage-Min:

    8 V

  • Input Voltage-Nom:

    15 V

  • JESD-30 Code:

    R-PDIP-T16

  • JESD-609 Code:

    e4

  • Length:

    19.305 mm

  • Number of Functions:

    1

  • Number of Terminals:

    16

  • Operating Temperature-Max:

    70 °C

  • Output Current-Max:

    2 A

  • Output Voltage-Max:

    5.2 V

  • Output Voltage-Min:

    5 V

  • Output Voltage-Nom:

    5.1 V

  • Package Body Material:

    PLASTIC/EPOXY

  • Package Code:

    DIP

  • Package Equivalence Code:

    DIP16,.3

  • Package Shape:

    RECTANGULAR

  • Package Style:

    IN-LINE

  • Qualification Status:

    Not Qualified

  • Seated Height-Max:

    5.08 mm

  • Supply Current-Max (Isup):

    23 mA

  • Supply Voltage-Max (Vsup):

    40 V

  • Supply Voltage-Min (Vsup):

    7.7 V

  • Supply Voltage-Nom (Vsup):

    15 V

  • Surface Mount:

    NO

  • Switcher Configuration:

    BUCK-BOOST

  • Switching Frequency-Max:

    1000 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

UC3856N Frequently Asked Questions (FAQs)

  • The UC3856N is a high-frequency device, and proper layout and placement are crucial to minimize EMI and noise. TI recommends a 4-layer PCB with a solid ground plane, and placing the IC close to the input capacitors and output inductors. Additionally, keep the feedback trace as short as possible and away from noisy signals.
  • The UC3856N's voltage feedback loop requires compensation to ensure stability. TI recommends using a type-2 compensator with a zero at 1/3 of the switching frequency and a pole at 1/2 of the switching frequency. The compensator values can be calculated using TI's Power Stage Designer software or by following the application note SLUA121.
  • The UC3856N has an absolute maximum input voltage rating of 30V. However, the recommended maximum operating input voltage is 28V to ensure reliable operation and to prevent damage to the IC.
  • Yes, the UC3856N can be used in a synchronous rectification topology. However, it requires additional external circuitry to control the synchronous rectifier MOSFET. TI provides an application note (SLUA123) that details the design considerations and component selection for synchronous rectification with the UC3856N.
  • The UC3856N's overcurrent protection is triggered by the voltage drop across the sense resistor (RS). Ensure that the sense resistor is properly sized and connected, and that the voltage at the CS pin is within the specified range (0.5V to 2.5V). Additionally, the overcurrent threshold can be adjusted by changing the value of the sense resistor.

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UC3856N 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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