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TL2845

AKTIV

Sparsamer unsymmetrischer 500-KHz-Strommodus-PWM-Controller mit 8,4V/7,6V UVLO 50 % Tastverhältnis,

Eine neuere Version dieses Produkts ist verfügbar

Drop-In-Ersatz mit gegenüber dem verglichenen Baustein verbesserter Funktionalität.
TL2845B AKTIV Hochleistungs-PWM, 30 V, 0,2 A, 500 KHz-Strommodus, 8,4 V/7,6 V UVLO, 50 % Tastverh., –40 C bis 85 C Pin-to-pin equivalent with reduced start-up current

Produktdetails

Topology Boost, Flyback Control mode Current Features Adjustable switching frequency, Current limiting, Error amplifier, Fixed frequency, Multi-topology Duty cycle (max) (%) 50
Topology Boost, Flyback Control mode Current Features Adjustable switching frequency, Current limiting, Error amplifier, Fixed frequency, Multi-topology Duty cycle (max) (%) 50
SOIC (D) 8 29.4 mm² (4.9 mm × 6 mm) SOIC (D) 14 51.9 mm² (8.65 mm × 6 mm) PDIP (P) 8 92.5083 mm² (9.81 mm × 9.43 mm)
  • Optimized for off-line and DC-to-DC converters
  • Low start-up current (< 1mA)
  • Automatic feed-forward 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
  • 500kHz operation
  • Error amplifier with low output resistance
  • Designed to be interchangeable with UC2842 and UC3842 series
  • Optimized for off-line and DC-to-DC converters
  • Low start-up current (< 1mA)
  • Automatic feed-forward 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
  • 500kHz operation
  • Error amplifier with low output resistance
  • Designed to be interchangeable with UC2842 and UC3842 series

The TL284x and TL384x 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. Some of the internally implemented circuits are an undervoltage lockout (UVLO), featuring a start-up current of less than 1mA, 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 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 TL284x and TL384x 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. Some of the internally implemented circuits are an undervoltage lockout (UVLO), featuring a start-up current of less than 1mA, 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 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.

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Technische Dokumentation

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Top-Dokumentation Typ Titel Format-Optionen Neueste englische Version herunterladen Datum
* Datenblatt TLx84x Current-Mode PWM Controllers datasheet (Rev. J) PDF | HTML 11.10.2024
Anwendungshinweis Conditioning a Switch-mode Power Supply Current Signal Using TI Op Amps (Rev. A) PDF | HTML 11.06.2021
Anwendungshinweis Understanding Inverting Buck-Boost Power Stages in Switch Mode Power Supplies (Rev. B) 12.03.2019
Anwendungshinweis UCC38C42 Family of High-Speed BiCMOS Current-Mode PWM Controllers 07.02.2002
Anwendungshinweis DN-65 Considerations in Powering BiCMOS ICs 05.09.1999
Anwendungshinweis DN-42A Design Considerations for Transitioning from UC3842 to the New UCC3802 05.09.1999
Anwendungshinweis DN-27 UC1842/UC1842A Family - Summary of Functional Differences 05.09.1999
Anwendungshinweis DN-26 UC3842A Low-Cost Start-up and Fault Protection Circuit 05.09.1999
Anwendungshinweis DN-40 The Effects of Oscillator Discharge Current Variations on Maximum Duty 05.09.1999
Anwendungshinweis DN-29 UC3842A Family - Frequency Foldback Technique Provides Protection 05.09.1999
Anwendungshinweis U-111, Practical Considerations in Current Mode Power Supplies 05.09.1999
Anwendungshinweis U-100A UC3842/3/4/5 Provides Low-Cost Current-Mode Control 05.09.1999
Anwendungshinweis DN-30 Programmable Electronic Circuit Breaker 05.09.1999
Anwendungshinweis DN-89 Comparing the UC3842, UCC3802, and UCC3809 Primary Side PWM Controllers 05.09.1999
Anwendungshinweis DN-62 Switching Power Supply Topology Voltage Mode vs. Current Mode 05.09.1999
Anwendungshinweis Understanding Buck Power Stages In Switchmode Power Supplies 04.03.1999
Anwendungshinweis Understanding Boost Power Stages In Switchmode Power Supplies 04.03.1999

Design und Entwicklung

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

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