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.
技術資料
| 上位の文書 | タイプ | タイトル | フォーマットオプション | 最新の英語版をダウンロード | 日付 | |
|---|---|---|---|---|---|---|
| * | データシート | UCC28251 Advanced PWM Controller With Prebias Operation データシート (Rev. E) | PDF | HTML | 2014/12/29 | ||
| セレクション・ガイド | 電源 IC セレクション・ガイド 2018 (Rev. R 翻訳版) | 英語版 (Rev.R) | 2018/09/13 | |||
| アナログ デザイン ジャーナル | Analog Applications Journal 3Q 2015 | 2015/07/24 | ||||
| アナログ デザイン ジャーナル | Fast input-voltage transient response with digitally-controlled isolated DC/DC | 2015/07/24 | ||||
| ホワイト・ペーパー | GaNの将来性に基づく電源ソリューションの向上 | 英語版 | 2015/03/02 | |||
| アプリケーション・ノート | Differences Between the UCC28251 and UCC28250 and Evaluation of the UCC28251 in (Rev. A) | 2013/02/15 |
設計と開発
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UCC28250EVM-501 — UCC28250 用評価基板、1 次側制御に高性能 PWM コントローラ搭載
UCC28250EVM-564 — 二次側制御におけるプリバイアス負荷動作対応 UCC28250 高度 PWM コントローラ用評価基板
UCC28251 Unencrypted PSpice Average Model Package (Rev. A)
| パッケージ | ピン数 | CAD シンボル、フットプリント、および 3D モデル |
|---|---|---|
| TSSOP (PW) | 20 | Ultra Librarian |
| VQFN (RGP) | 20 | Ultra Librarian |
購入と品質
推奨製品には、この TI 製品に関連するパラメータ、評価基板、またはリファレンス デザインが存在する可能性があります。