UCC28251
- Prebiased Startup
- Synchronous Rectifier Control Outputs with
Programmable Delays (Including Zero Delay
Support) - Voltage Mode Control with Input Voltage
Feed-Forward or Current Mode Control - Primary or Secondary-Side Control
- 3.3-V, 1.5% Accurate Reference Output
- Lower Minimum Operating Frequency
- 1% Accurate Cycle-by-Cycle Over Current
Protection with Matched Duty Cycle Outputs - Programmable Soft-Start and Hiccup Restart
Timer - Thermally Enhanced 4-mm × 4-mm VQFN-20
Package and 20-pin TSSOP Package
The UCC28251 PWM controller is designed for high power density applications that may have stringent prebiased startup requirements. The UCC28251’s integrated synchronous rectifier control outputs target high efficiency and high performance topologies such as half-bridge, full-bridge, interleaved forward, and push-pull. The UCC27210 half bridge drivers and UCC2752x MOSFET drivers used in conjunction with the UCC28251 provide a complete power converter solution.
The UCC28251 is a functional variant of the UCC28250 PWM Controller. While the same basic functionality of the UCC28250 is largely maintained, the UCC28251 is designed to enhance performance in both offline, 400-V input DC-to-DC applications and 48-V input full-bridge or half-bridge applications.
Externally programmable soft-start, used in conjunction with an internal pre-biased startup circuit, allows the controller to gradually reach a steady-state operating point under all output conditions. The UCC28251 can be configured for primary or secondary-side control and either voltage or current mode control can be implemented.
The oscillator operates at frequencies up to 1.8 MHz, and can be synchronized to an external clock. Input voltage feedforward, cycle-by-cycle current limit, and a programmable hiccup timer allow the system to stay within a safe operation range. Input voltage, output voltage and temperature protection can be implemented. Dead time between primary-side switch and secondary-side synchronous rectifiers can be independently programmed.
技術文件
| 類型 | 標題 | 日期 | ||
|---|---|---|---|---|
| * | Data sheet | UCC28251 Advanced PWM Controller With Prebias Operation datasheet (Rev. E) | PDF | HTML | 2014年 12月 29日 |
| Selection guide | Power Management Guide 2018 (Rev. R) | 2018年 6月 25日 | ||
| Analog Design Journal | Analog Applications Journal 3Q 2015 | 2015年 7月 24日 | ||
| Analog Design Journal | Fast input-voltage transient response with digitally-controlled isolated DC/DC | 2015年 7月 24日 | ||
| White paper | Advancing Power Supply Solutions Through the Promise of GaN | 2015年 2月 24日 | ||
| Application note | Differences Between the UCC28251 and UCC28250 and Evaluation of the UCC28251 in (Rev. A) | 2013年 2月 15日 |
設計與開發
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UCC28250EVM-501 — 用於一次側控制中的 UCC28250 進階 PWM 控制器的評估模組
UCC28250EVM-564 — 用於在二次側控制中具有預偏壓負載操作的 UCC28250 進階 PWM 控制器的評估模組
| 封裝 | 針腳 | CAD 符號、佔位空間與 3D 模型 |
|---|---|---|
| TSSOP (PW) | 20 | Ultra Librarian |
| VQFN (RGP) | 20 | Ultra Librarian |
訂購與品質
- RoHS
- REACH
- 產品標記
- 鉛塗層/球物料
- MSL 等級/回焊峰值
- MTBF/FIT 估算值
- 材料內容
- 認證摘要
- 進行中持續性的可靠性監測
- 晶圓廠位置
- 組裝地點