UCC28781
- Switching frequency: > 500 kHz
- Enables peak efficiency > 93 %
- Enables < 45 mW stand-by power
- Adaptive control for zero-voltage-switching (ZVS) and dead-time optimization
- EMI frequency-dithering without trade-offs on transient response or audible noise
- Programmable adaptive burst mode (ABM) with internal compensation
- X-capacitor discharge capability
- Over-temperature, overvoltage, output short-circuit, overcurrent, over-power, and pin-fault protections
- Auto-recovery fault-responses
- 4 mm × 4 mm, 24-pin, QFN package
The UCC28781 is a zero-voltage-switching (ZVS) controller which can be used at very high switching frequencies to minimize the size of the transformer and enable high power density.
With direct synchronous rectifier (SR) control, the controller does not need a separate SR controller, as it can drive the SR FET directly to maximize efficiency and simplify design. (For isolated applications, an isolated gate-driver IC is required.)
Using adaptive dead-time control for ZVS, switching losses and EMI are minimized. This design results in a controller with extremely high conversion efficiency across the entire operating range.
The programmable adaptive burst mode (ABM) gives flexibility to control when the controller enters and exits standby mode to optimize standby power in light and no-load conditions. ABM also helps to reduce ripple and minimize audible noise.
The controller offers multiple protection modes with automatic restart (retry) responses.
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具備升級功能，可直接投入使用替代所比較的裝置。
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 | UCC28781 Zero-Voltage-Switching Flyback Controller with Dedicated Synchronous Rectifier Gate-Drive datasheet | PDF | HTML | 2021/12/8 | ||
| * | 使用指南 | Using the UCC28781EVM-053 Zero-Voltage-Switching Flyback Converter (Rev. A) | PDF | HTML | 2022/9/15 | ||
| Application brief | Flyback Selection Guide | PDF | HTML | 2022/6/23 | |||
| 證書 | UCC28781EVM-053 EU RoHS Declaration of Conformity (DoC) | 2021/8/19 |
設計與開發
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UCC28781EVM-053 — 適用於車用 500-Vdc 輸入 ZVS 返馳電源供應器應用的 UCC28781-Q1 評估模組
UCC28781EMV-053 展示了使用零電壓切換返馳 (ZVSF) 控制器的 60-W、15-V 輸出的高效率，高密度，高壓汽車偏壓電源。 UCC28781-Q1 直接驅動一次側矽 MOSFET，並透過 UCC5304 絕緣式閘極驅動器驅動二次側同步整流器，以提升效率並達到 ZVS。
PMP23331 — 適合伺服器應用的 19-W、AC/DC 多輸出 5-V 與 12-V ZVS 返馳參考設計
| 封裝 | 針腳 | CAD 符號、佔位空間與 3D 模型 |
|---|---|---|
| WQFN (RTW) | 24 | 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。