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

UCC28720

AKTIV

Konstantspannungs- und Konstantstromregler mit primärseitiger Regelung für bipolare Stromversorgungs

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Datenblatt

UCC28720

AKTIV
Datenblatt Jetzt bestellen

Produktdetails

Rating Catalog Topology Buck, Flyback Iout (max) (A) 3 Vin (max) (V) 450 Vin (min) (V) 9 Vout (max) (V) 20 Vout (min) (V) 3.3 Control mode Primary-side regulation Features CC/CV output regulation, Current limiting, DCM, Green mode, High-voltage startup, Input line monitor, Leading edge blanking, Light load efficiency, Low power, Overcurrent protection, Primary-side regulated, Quasi-Resonant, Soft start Operating temperature range (°C) -40 to 125 Iq (typ) (µA) 2000 Duty cycle (max) (%) 99
Rating Catalog Topology Buck, Flyback Iout (max) (A) 3 Vin (max) (V) 450 Vin (min) (V) 9 Vout (max) (V) 20 Vout (min) (V) 3.3 Control mode Primary-side regulation Features CC/CV output regulation, Current limiting, DCM, Green mode, High-voltage startup, Input line monitor, Leading edge blanking, Light load efficiency, Low power, Overcurrent protection, Primary-side regulated, Quasi-Resonant, Soft start Operating temperature range (°C) -40 to 125 Iq (typ) (µA) 2000 Duty cycle (max) (%) 99
SOIC (D) 7 29.4 mm² 4.9 x 6
  • < 10-mW No-Load Power
  • Primary-Side Regulation (PSR) Eliminates Opto-
    Coupler
  • ±5% Voltage and Current Regulation Across Line
    and Load
  • 700-V Start-Up Switch
  • 80-kHz Maximum Switching Frequency Enables
    High-Power Density Charger Designs
  • Quasi-Resonant Valley-Switching Operation for
    Highest Overall Efficiency
  • Wide VDD Range Allows Small Bias Capacitor
  • Dynamic BJT Drive
  • Overvoltage, Low-Line, and Overcurrent
    Protection Functions
  • Programmable Cable Compensation
  • SOIC-7 Package
  • < 10-mW No-Load Power
  • Primary-Side Regulation (PSR) Eliminates Opto-
    Coupler
  • ±5% Voltage and Current Regulation Across Line
    and Load
  • 700-V Start-Up Switch
  • 80-kHz Maximum Switching Frequency Enables
    High-Power Density Charger Designs
  • Quasi-Resonant Valley-Switching Operation for
    Highest Overall Efficiency
  • Wide VDD Range Allows Small Bias Capacitor
  • Dynamic BJT Drive
  • Overvoltage, Low-Line, and Overcurrent
    Protection Functions
  • Programmable Cable Compensation
  • SOIC-7 Package

The UCC28720 flyback power supply controller provides isolated-output Constant-Voltage (CV) and Constant-Current (CC) output regulation without the use of an optical coupler. The devices process information from the primary power switch and an auxiliary flyback winding for precise control of output voltage and current.

An internal 700-V start-up switch, dynamically-controlled operating states and a tailored modulation profile support ultra-low standby power without sacrificing start-up time or output transient response.

Control algorithms in the UCC28720 allow operating efficiencies to meet or exceed applicable standards. The output drive interfaces to a bipolar transistor power switch. Discontinuous conduction mode (DCM) with valley switching reduces switching losses. Modulation of switching frequency and primary current peak amplitude (FM and AM) keeps the conversion efficiency high across the entire load and line ranges.

The controller has a maximum switching frequency of 80 kHz and always maintains control of the peak-primary current in the transformer. Protection features help keep primary and secondary component stresses in check. The UCC28720 allows compensation for voltage drop in the cable to be programmed with an external resistor.

The UCC28720 flyback power supply controller provides isolated-output Constant-Voltage (CV) and Constant-Current (CC) output regulation without the use of an optical coupler. The devices process information from the primary power switch and an auxiliary flyback winding for precise control of output voltage and current.

An internal 700-V start-up switch, dynamically-controlled operating states and a tailored modulation profile support ultra-low standby power without sacrificing start-up time or output transient response.

Control algorithms in the UCC28720 allow operating efficiencies to meet or exceed applicable standards. The output drive interfaces to a bipolar transistor power switch. Discontinuous conduction mode (DCM) with valley switching reduces switching losses. Modulation of switching frequency and primary current peak amplitude (FM and AM) keeps the conversion efficiency high across the entire load and line ranges.

The controller has a maximum switching frequency of 80 kHz and always maintains control of the peak-primary current in the transformer. Protection features help keep primary and secondary component stresses in check. The UCC28720 allows compensation for voltage drop in the cable to be programmed with an external resistor.
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Technische Dokumentation

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Typ Titel Datum
* Data sheet UCC28720 Constant-Voltage, Constant-Current Controller With Primary-Side Regulation datasheet (Rev. B) PDF | HTML 30 Sep 2015
Application note Flyback Aux Winding OVP and UVLO Fault Sensing Design and Troubleshooting Tips PDF | HTML 31 Aug 2021
Application note Minimize Standby Consumption for UCC287XX Family 01 Aug 2019
Application note Maximum Output Power and Thermal Considerations for UCC28720 and UCC28722 06 Dez 2017
Application note Troubleshooting TI PSR controllers 03 Okt 2016
Technical article Slim down your flyback; lose that excess snubber PDF | HTML 15 Feb 2016
White paper Control Challenges for Low Power AC/DC Converters 02 Okt 2015
White paper Control Challenges for Low Power AC/DC Converters (PPT) 02 Okt 2015
Technical article Designing multiple output converters with primary side sensing PDF | HTML 04 Aug 2015
Application note 5-W USB Flyback Design Example Using the UCC28722 08 Jan 2014

Design und Entwicklung

Weitere Bedingungen oder erforderliche Ressourcen enthält gegebenenfalls die Detailseite, die Sie durch Klicken auf einen der unten stehenden Titel erreichen.

Evaluierungsplatine

UCC28720EVM-212 — UCC28720EVM-212 5W Evaluierungsmodul für USB-Offline-Adapter

The UCC28720EVM-212 is a 5W evaluation module for evaluating an off line adapter for USB applications. It is intended for evaluation purposes and is not intended to be an end product. The UCC28720EVM-212 converters 100V to 240V RMS input voltage down to 5V DC, with a 1A current limit for USB (...)
Benutzerhandbuch: PDF
Nicht verfügbar auf TI.com
Berechnungstool

SLUC528 — UCC28722 MathCad Design Tool

Unterstützte Produkte und Hardware

Unterstützte Produkte und Hardware

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AC/DC- und DC/DC-Controller (externer FET)
UCC28720 — Konstantspannungs- und Konstantstromregler mit primärseitiger Regelung für bipolare Stromversorgungs UCC28722 — Kostengünstiger CVCC-Flyback-Controller mit primärseitiger Regelung für bipolare Netzteile
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Berechnungstool

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Unterstützte Produkte und Hardware

Unterstützte Produkte und Hardware

Produkte
AC/DC- und DC/DC-Controller (externer FET)
UCC28720 — Konstantspannungs- und Konstantstromregler mit primärseitiger Regelung für bipolare Stromversorgungs UCC28722 — Kostengünstiger CVCC-Flyback-Controller mit primärseitiger Regelung für bipolare Netzteile
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Referenzdesigns

PMP9622 — Referenzdesign für 350-W-Vollbrücke mit CVCC (Konstantspannung/-strom) und Phasenverschiebung

This reference design uses the UCC3895 Phase-Shifted Full Bridge controller to implement a high efficiency, 120VAC input to 44Vdc up to 8A output.  The power supply is set up to be  constant voltage-constant current.  The voltage and current are set by fixed resistor values and could (...)
Test report: PDF
Schaltplan: PDF
Gehäuse Pins CAD-Symbole, Footprints und 3D-Modelle
SOIC (D) 7 Ultra Librarian
Es gelten die allgemeinen Geschäftsbedingungen von TI für Evaluierungsartikel.

Bestellen & Qualität

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  • MSL-Rating / Spitzenrückfluss
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  • Materialinhalt
  • Qualifikationszusammenfassung
  • Kontinuierliches Zuverlässigkeitsmonitoring
Beinhaltete Information:
  • Werksstandort
  • Montagestandort

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