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.
技術文件
| 重要文件 | 類型 | 標題 | 格式選項 | 下載最新的英文版本 | 日期 | |
|---|---|---|---|---|---|---|
| * | 資料表 | UCC28750 Current-Mode Flyback Controller with Secondary-Side Regulation (SSR) for Off-Line Applications datasheet | PDF | HTML | 2022/4/1 | ||
| 技術文章 | 輔助返馳電源供應的注意事項 (Rev. A) | PDF | HTML | Download English Version (Rev.A) | PDF | HTML | 2024/9/18 | |
| 應用說明 | Retrofit UCC28750 EVM to Support Aux Power Application | PDF | HTML | 2024/6/6 | |||
| 技術文章 | 新增單一電容器以增進雙輸出返馳電源供應器的交互穩壓 | PDF | HTML | Download English Version | PDF | HTML | 2024/3/20 | |
| 技術文章 | 緩衝返馳式轉換器 | PDF | HTML | Download English Version | PDF | HTML | 2024/3/20 | |
| 證書 | UCC28750EVM-071 EU Declaration of Conformity (DoC) | PDF | HTML | 2023/11/20 |
設計與開發
如需其他條款或必要資源，請按一下下方的任何標題以檢視詳細頁面 (如有)。
UCC28750EVM-071 — 適用於電流模式返馳控制器的 UCC28750 評估模組
UCC28750-SIMPLIS — UCC28750 Flyback Controller SIMPLIS Model
UCC28750-CALC — Excel calculator tool for the UCC28750 Flyback controller
PMP31288 — 7.8W 寬 AC 輸入非隔離式高壓側降壓參考設計
PMP31338 — 超寬輸入非隔離式高壓側降壓轉換器參考設計
此為超寬輸入離線高壓側降壓參考設計，可在最大 0.6A 電流下提供 13V 輸出。輸入電壓範圍為 85VAC 至 485VAC。此參考設計使用不具備光耦合器回饋的 UCC28750 電流模式返馳控制器。此設計未採用隔離技術，而是使用低成本電流鏡來調節輸出。此設計旨在於耐受電感器附近最高 200mT 的磁場。
PMP31376 — 通用 AC 輸入至9V-26.5V、100W 電池充電器參考設計
此參考設計為離線隔離返馳。AC-DC 功率級以 UCC28750 固定頻率尖峰電流模式控制器為基礎，其具備連續傳導模式 (CCM) 和不連續傳導模式 (DCM) 調變，以及二次側穩壓功能。頻率折返和突衝模式可提升輕負載效率，而頻率抖動可減少電磁干擾 (EMI) 特性。控制器提供多種保護功能，包括過欠電壓鎖定、Vout 過電壓、過功率和短路保護。
PMP31422 — 低待機功耗、寬輸入電壓 UCC287508 參考設計
本參考設計專為低待機功耗與低成本需求而設計。本設計展示了 UCC287508 隔離式返馳控制器，可在 85VAC 至 400VAC 的超寬輸入電壓範圍內運作，並輸出隔離的 12V、1.25A 電流。
TIDA-010257 — 10kW Vienna 整流器式三相功率因數校正參考設計
| 封裝 | 針腳 | CAD 符號、佔位空間與 3D 模型 |
|---|---|---|
| SOT-23 (DBV) | 6 | Ultra Librarian |
訂購與品質
建議產品可能具有與此 TI 產品相關的參數、評估模組或參考設計。