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

UCC28750

AKTIV

Strommodus-Flyback-Controller mit sekundärseitiger Regelung (SSR) für Offline-Anwendungen

Produktdetails

Operating temperature range (°C) -40 to 125 Control mode Current Topology Buck, Flyback Rating Catalog Features Brown Out, Burst mode, CCM, Current limiting, Cycle-by-cycle over-current protection, Cycle-by-cycle overcurrent protection, DCM, Fixed frequency, Frequency Dithering, Light load efficiency, Light-load efficiency, Output short-circuit protection, Over Temperature Protection, Over Voltage Protection, Overcurrent protection, SSR, Secondary-side regulated, Soft start, Under voltage lock out
Operating temperature range (°C) -40 to 125 Control mode Current Topology Buck, Flyback Rating Catalog Features Brown Out, Burst mode, CCM, Current limiting, Cycle-by-cycle over-current protection, Cycle-by-cycle overcurrent protection, DCM, Fixed frequency, Frequency Dithering, Light load efficiency, Light-load efficiency, Output short-circuit protection, Over Temperature Protection, Over Voltage Protection, Overcurrent protection, SSR, Secondary-side regulated, Soft start, Under voltage lock out
SOT-23 (DBV) 6 8.12 mm² 2.9 x 2.8
  • Stable continuous conduction mode (CCM) operation with internal slope compensation
  • Fixed-frequency operation of 65kHz or 100kHz
  • Secondary-side regulation (SSR) with opto-coupler
  • Frequency foldback and burst mode for improved light-load efficiency
  • Frequency dithering for improved EMI performance
  • Gate source/sink capability: 300mA/500mA
  • Internal 4ms soft-start
  • Robust protection features:
    • Over-voltage and Under-voltage lockout
    • Output over-power protection (OPP)
    • Output short-circuit (OSC) protection
    • Output over-voltage (OVP) protection
    • Cycle-by-cycle peak over-current limit
    • External over-temperature, over-voltage protection (OTP, OVP) and brownout detection on FLT pin
    • Internal thermal shutdown
  • Stable continuous conduction mode (CCM) operation with internal slope compensation
  • Fixed-frequency operation of 65kHz or 100kHz
  • Secondary-side regulation (SSR) with opto-coupler
  • Frequency foldback and burst mode for improved light-load efficiency
  • Frequency dithering for improved EMI performance
  • Gate source/sink capability: 300mA/500mA
  • Internal 4ms soft-start
  • Robust protection features:
    • Over-voltage and Under-voltage lockout
    • Output over-power protection (OPP)
    • Output short-circuit (OSC) protection
    • Output over-voltage (OVP) protection
    • Cycle-by-cycle peak over-current limit
    • External over-temperature, over-voltage protection (OTP, OVP) and brownout detection on FLT pin
    • Internal thermal shutdown

UCC28750 is a highly-integrated current-mode, continuous-conduction-capable, PWM controller optimized for high performance, low standby power, and cost effective offline flyback converter applications using an opto-coupler. During light-load conditions the device enters frequency foldback and burst modes, improving light-load efficiency. The burst-mode algorithm used in UCC28750 controls the minimum effective switching frequency to prevent audible noise during light-load conditions. Frequency dithering improves EMI performance, and is active in normal, frequency foldback, and power boost operations.

UCC28750 provides protection features that enable a robust converter design with minimal external components. Output over-power protection (OPP) and cycle-by-cycle over-current limit protect the load and power-stage components from electrical stress. Over-voltage and under-voltage lockout (OVLO and UVLO) prevent switching in unwanted input conditions. The FLT pin provides line brown-out sensing and protection, or external over-temperature and over-voltage protection, depending on the device variant. The FLT pin is also used to disable the device through external control by pulling the pin to ground, regardless of the device variant.

UCC28750 is a highly-integrated current-mode, continuous-conduction-capable, PWM controller optimized for high performance, low standby power, and cost effective offline flyback converter applications using an opto-coupler. During light-load conditions the device enters frequency foldback and burst modes, improving light-load efficiency. The burst-mode algorithm used in UCC28750 controls the minimum effective switching frequency to prevent audible noise during light-load conditions. Frequency dithering improves EMI performance, and is active in normal, frequency foldback, and power boost operations.

UCC28750 provides protection features that enable a robust converter design with minimal external components. Output over-power protection (OPP) and cycle-by-cycle over-current limit protect the load and power-stage components from electrical stress. Over-voltage and under-voltage lockout (OVLO and UVLO) prevent switching in unwanted input conditions. The FLT pin provides line brown-out sensing and protection, or external over-temperature and over-voltage protection, depending on the device variant. The FLT pin is also used to disable the device through external control by pulling the pin to ground, regardless of the device variant.

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Technische Dokumentation

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Typ Titel Datum
* Data sheet UCC28750 Current-Mode Flyback Controller with Secondary-Side Regulation (SSR) for Off-Line Applications datasheet PDF | HTML 01 Apr 2022
Technical article Considerations for auxiliary flyback power supplies (Rev. A) PDF | HTML 06 Sep 2024
Application note Retrofit UCC28750 EVM to Support Aux Power Application PDF | HTML 06 Jun 2024
Technical article Snubbing the flyback converter PDF | HTML 26 Feb 2024
Technical article Adding a single capacitor to improve cross-regulation in dual-output flyback power supplies PDF | HTML 21 Dez 2023
Certificate UCC28750EVM-071 EU Declaration of Conformity (DoC) 20 Nov 2023
EVM User's guide Using the UCC28750EVM-071 60-W AC to DC Converter Evaluation Module User's Guide PDF | HTML 15 Nov 2023

Design und Entwicklung

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Evaluierungsplatine

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Benutzerhandbuch: PDF | HTML
Berechnungstool

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Gehäuse Pins CAD-Symbole, Footprints und 3D-Modelle
SOT-23 (DBV) 6 Ultra Librarian

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