UCC28750
Strommodus-Flyback-Controller mit sekundärseitiger Regelung (SSR) für Offline-Anwendungen
UCC28750
- 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.
Technische Dokumentation
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
Weitere Bedingungen oder erforderliche Ressourcen enthält gegebenenfalls die Detailseite, die Sie durch Klicken auf einen der unten stehenden Titel erreichen.
UCC28750EVM-071 — UCC28750-Evaluierungsmodul für Strommodus-Flyback-Controller
UCC28750-SIMPLIS — UCC28750 Flyback Controller SIMPLIS Model
Unterstützte Produkte und Hardware
Produkte
AC/DC- und DC/DC-Controller (externer FET)
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Gehäuse | Pins | CAD-Symbole, Footprints und 3D-Modelle |
---|---|---|
SOT-23 (DBV) | 6 | Ultra Librarian |
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