UC2843 Datenblatt, Produktinformationen und Support (2024)

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AC/DC- und DC/DC-Controller (externer FET)
  • parametric-filter AC/DC- und DC/DC-Controller (externer FET)
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Energiemanagement

AC/DC- und DC/DC-Controller (externer FET)

AKTIV

30-V-, 1-A-, 500-kHz-Strommodus-PWM-Controller mit 8,4V/7,6V UVLO, 100 % Tastverhältnis, -40 bis 85

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Datenblatt

  • document-pdfAcrobat UCx84x Current-Mode PWM Controllers datasheet (Rev. G) (Englisch) PDF | HTML

Produktdetails

Vin (max) (V) 28 Operating temperature range (°C) -40 to 85 Control mode Peak current mode Topology Boost, Buck, Buck boost, Flyback, Forward Rating Catalog Features Adjustable switching frequency, Current limiting, Dead time control, Error amplifier, Fixed frequency, Multi-topology Duty cycle (max) (%) 100

Vin (max) (V) 28 Operating temperature range (°C) -40 to 85 Control mode Peak current mode Topology Boost, Buck, Buck boost, Flyback, Forward Rating Catalog Features Adjustable switching frequency, Current limiting, Dead time control, Error amplifier, Fixed frequency, Multi-topology Duty cycle (max) (%) 100

PDIP (P) 8 92.5083 mm² 9.81 x 9.43 SOIC (D) 14 51.9 mm² 8.65 x 6 SOIC (D) 8 29.4 mm² 4.9 x 6
  • Optimized for off-line and DC-to-DC converters
  • Low start-up current (< 1 mA)
  • Automatic feedforward compensation
  • Pulse-by-pulse current limiting
  • Enhanced load-response characteristics
  • Undervoltage lockout with hysteresis
  • Double-pulse suppression
  • High-current totem-pole output
  • Internally trimmed bandgap reference
  • Up to 500-kHz operation
  • Error amplifier with low output resistance
  • Optimized for off-line and DC-to-DC converters
  • Low start-up current (< 1 mA)
  • Automatic feedforward compensation
  • Pulse-by-pulse current limiting
  • Enhanced load-response characteristics
  • Undervoltage lockout with hysteresis
  • Double-pulse suppression
  • High-current totem-pole output
  • Internally trimmed bandgap reference
  • Up to 500-kHz operation
  • Error amplifier with low output resistance

The UCx84x series of control integrated circuits provide the features that are necessary to implement off-line or DC-to-DC fixed-frequency current-mode control schemes, with a minimum number of external components. The internally implemented circuits include an undervoltage lockout (UVLO), featuring a start-up current of less than 1 mA, and a precision reference trimmed for accuracy at the error amplifier input. Other internal circuits include logic to ensure latched operation, a pulse-width modulation (PWM) comparator that also provides current-limit control, and a totem-pole output stage that is designed to source or sink high-peak current. The output stage, suitable for driving N-channel MOSFETs, is low when it is in the off state.

The UCx84x family offers a variety of package options, temperature range options, choice of maximum duty cycle, and choice of turnon and turnoff thresholds and hysteresis ranges. Devices with higher turnon or turnoff hysteresis are ideal choices for off-line power supplies, while the devices with a narrower hysteresis range are suited for DC-DC applications. The UC184x devices are specified for operation from –55°C to 125°C, the UC284x series is specified for operation from –40°C to 85°C, and the UC384x series is specified for operation from 0°C to 70°C.

The UCx84x series of control integrated circuits provide the features that are necessary to implement off-line or DC-to-DC fixed-frequency current-mode control schemes, with a minimum number of external components. The internally implemented circuits include an undervoltage lockout (UVLO), featuring a start-up current of less than 1 mA, and a precision reference trimmed for accuracy at the error amplifier input. Other internal circuits include logic to ensure latched operation, a pulse-width modulation (PWM) comparator that also provides current-limit control, and a totem-pole output stage that is designed to source or sink high-peak current. The output stage, suitable for driving N-channel MOSFETs, is low when it is in the off state.

The UCx84x family offers a variety of package options, temperature range options, choice of maximum duty cycle, and choice of turnon and turnoff thresholds and hysteresis ranges. Devices with higher turnon or turnoff hysteresis are ideal choices for off-line power supplies, while the devices with a narrower hysteresis range are suited for DC-DC applications. The UC184x devices are specified for operation from –55°C to 125°C, the UC284x series is specified for operation from –40°C to 85°C, and the UC384x series is specified for operation from 0°C to 70°C.

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Drop-In-Ersatz mit gegenüber dem verglichenen Baustein verbesserter Funktionalität
TL2843B AKTIV 30-V-, 0,2-A-Hochleistungs-PWM im 500 kHz-Strommodus mit 8,4V/7,6V UVLO, 100 % Tastverhältnis, -40 b Start-up curent is lower than 0.5mA
UC2843A AKTIV 30-V-, 1-A-, 500-kHz-Strommodus-PWM-Controller mit 8,4V/7,6V UVLO, 100 % Tastverhältnis, 40 bis 85 G Pin-to-pin equivalent with reduced startup current
Selbe Funktionalität wie der verglichene Baustein bei gleicher Anschlussbelegung
UCC28C53 AKTIV Industrieller 30-V-PWM-Controller mit geringem Stromverbrauch, 8,4-V/7.6-V-UVLO, 100 % Tastverhältni Lower startup and supply current, better reference voltage accuracy and faster overcurrent protection

Technische Dokumentation

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Typ Titel Datum
* Data sheet UCx84x Current-Mode PWM Controllers datasheet (Rev. G) PDF | HTML 11 Jul 2022
Application note Conditioning a Switch-mode Power Supply Current Signal Using TI Op Amps (Rev. A) PDF | HTML 11 Jun 2021
Application note Understanding Inverting Buck-Boost Power Stages in Switch Mode Power Supplies (Rev. B) 12 Mär 2019
Selection guide Power Management Guide 2018 (Rev. R) 25 Jun 2018
Application note UCC38C42 Family of High-Speed BiCMOS Current-Mode PWM Controllers 07 Feb 2002
Application note DN-26 UC3842A Low-Cost Start-up and Fault Protection Circuit 05 Sep 1999
Application note DN-27 UC1842/UC1842A Family - Summary of Functional Differences 05 Sep 1999
Application note DN-40 The Effects of Oscillator Discharge Current Variations on Maximum Duty 05 Sep 1999
Application note DN-42A Design Considerations for Transitioning from UC3842 to the New UCC3802 05 Sep 1999
Application note DN-65 Considerations in Powering BiCMOS ICs 05 Sep 1999
Application note U-100A UC3842/3/4/5 Provides Low-Cost Current-Mode Control 05 Sep 1999
Application note U-111, Practical Considerations in Current Mode Power Supplies 05 Sep 1999
Application note Understanding Boost Power Stages In Switchmode Power Supplies 04 Mär 1999
Application note Understanding Buck Power Stages In Switchmode Power Supplies 04 Mär 1999

Design und Entwicklung

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Simulationsmodell

UCC28C43 PSpice Transient Model

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Gehäuse Pins CAD-Symbole, Footprints und 3D-Modelle
PDIP (P) 8 Ultra Librarian
SOIC (D) 14 Ultra Librarian
SOIC (D) 8 Ultra Librarian

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