UCC24650
- Enables Excellent Load Transient Performance and Zero Standby Power
- Enables Smallest Output Capacitor for Tight ΔVOUT
- No External Components Required
- <50 µA Device Current Consumption (Typical)
- 5-V to 28-V Output Monitoring Capability
- 3% Voltage Droop Detection (Patent Pending)
- 200-V Wake-Up Switch
- Enables and Disables SR Controller, Relay Control, or Other Secondary Circuits
- SOT-23 5-Pin Package
The UCC24650 is an easy-to-use secondary-side voltage monitor that periodically measures its own VDD voltage. A relative droop of 3% from the previous reading triggers a alert signal to a receiving primary-side regulation (PSR) controller. Its low-power consumption helps achieve <5-mW standby loss in many applications.
An internal 200-V MOSFET switch is applied across a ground-referenced rectifier to provide a current-limited pulse to the flyback transformer secondary winding, which couples the signal to the primary-side controller. This signal is repeated at 33 kHz until controller-driven switching activity is detected.
Relative-droop detection allows scaling to any voltage between 5 and 28 V. The alert function allows very-low standby frequency to minimize switching loss and reduction of output capacitance needed to respond to a heavy load step. This monitor is used with a controller capable of detecting the signal, such as the UCC28730 PSR flyback controller.
The UCC24650 also provides an enable and disable signal which can be used to control a secondary-side circuit during no-load conditions to reduce standby power loss. Such a circuit may be a synchronous rectifier controller or a relay driver, for example.
技術文件
| 類型 | 標題 | 日期 | ||
|---|---|---|---|---|
| * | Data sheet | UCC24650 200-V Wake-Up Monitor for Fast Transient PSR datasheet | PDF | HTML | 2015年 2月 4日 |
| More literature | Achieving High Power Density and Ultra Low Standby Power in Flyback Converters | 2021年 3月 23日 | ||
| Technical article | Get smarter about ‘zero’ standby power in your next appliance design | PDF | HTML | 2018年 8月 27日 | |
| Application note | Rapid Transient Response With UCC28633 PSR-Flyback and UCC24650 Wake-Up Monitor | 2015年 2月 27日 |
設計與開發
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UCC28730EVM-552 — 具有 UCC24650 次級側邊喚醒的 UCC28730 初級側返馳控制器
UCC28730EVM-552 評估模組是一款 10-W 離線不連續模式 (DCM) 返馳式轉換器，可提供定電壓 (CV) 和定電流 (CC) 輸出穩壓，無需使用光學耦合器。 一次側控制器會偵測來自二次側壓降監控器 UCC24650 的喚醒訊號，以改善對大負載步進的瞬態回應。 EVM 展示 UCC28730 如何能以內部 700-V 啟動開關，動態控制操作狀態及量身打造的調變曲線，無需犧牲啟動時間或輸出瞬態回應。
PMP9561 — 針對空載零功耗最佳化的 5V/10W 離線 DCM 返馳式轉換器 - 參考設計
PMP11303 — 高效率 350W AC/DC 電源參考設計
TIDA-01560 — 具有 4mW 零待機功耗的 15W 雙隔離式輸出偏壓電源供應參考設計
PMP10407 — 具有負載瞬態回應的通用 AC 輸入、5V/10A/50W PSR 返馳電源供應參考設計
| 封裝 | 針腳 | CAD 符號、佔位空間與 3D 模型 |
|---|---|---|
| SOT-23 (DBV) | 5 | 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
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。