計算工具
UCC28702
- < 30-mW No-Load Power for 5-Star Rating
- Primary-Side Regulation (PSR) Eliminates Opto-Coupler
- ±5% Voltage and Current Regulation
- 130-kHz Maximum Switching Frequency Enables High-Power
Density Charger Designs - Quasi-Resonant Valley-Switching Operation for Highest
Overall Efficiency - Patent-Pending Frequency-Jitter Scheme to Ease EMI
Compliance - Wide VDD Range Allows Small Bias Capacitor
- Clamped Gate-Drive Output for MOSFET
- Protection Functions: Overvoltage, Low-Line, and
Overcurrent - Programmable Cable Compensation (UCC28700 Only)
- NTC Resistor Interface (UCC28701, UCC28702 and UCC28703
Only) With Fixed Cable Compensation Options - SOT-23 Package
The UCC28700 family of flyback power supply controllers provides Constant-Voltage (CV) and Constant-Current (CC) output regulation without the use of an optical coupler. The devices process information from the primary power switch and an auxiliary flyback winding for precise control of output voltage and current. Low start-up current, dynamically controlled operating states and a tailored modulation profile support very low standby power without sacrificing start-up time or output transient response.
Control algorithms in the UCC28700 family allow operating efficiencies to meet or exceed applicable standards. The output drive interfaces to a MOSFET power switch. Discontinuous Conduction Mode (DCM) with valley switching reduces switching losses. Modulation of switching frequency and primary current peak amplitude (FM and AM) keeps the conversion efficiency high across the entire load and line ranges.
The controllers have a maximum switching frequency of 130 kHz and always maintain control of the peak-primary current in the transformer. Protection features help keep primary and secondary component stresses in check. The UCC28700 allows the level of cable compensation to be programmed. The UCC28701, UCC28702, and UCC28703 devices allow remote temperature sensing using a Negative Temperature Coefficient (NTC) resistor while providing fixed cable-compensation levels.
技術文件
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檢視所有 10 | 重要文件 | 類型 | 標題 | 格式選項 | 日期 |
|---|---|---|---|---|
| * | Data sheet | UCC2870x Constant-Voltage, Constant-Current Controller With Primary-Side Regulation datasheet (Rev. A) | PDF | HTML | 2014年 12月 12日 |
| Application note | Flyback Aux Winding OVP and UVLO Fault Sensing Design and Troubleshooting Tips | PDF | HTML | 2021年 8月 31日 | |
| Application note | Minimize Standby Consumption for UCC287XX Family | 2019年 8月 1日 | ||
| Application note | Selecting Electrolitic Bus Capacitor for Universal Input | 2018年 7月 17日 | ||
| Selection guide | Power Management Guide 2018 (Rev. R) | 2018年 6月 25日 | ||
| Application note | Troubleshooting TI PSR controllers | 2016年 10月 3日 | ||
| White paper | Control Challenges for Low Power AC/DC Converters | 2015年 10月 2日 | ||
| White paper | Control Challenges for Low Power AC/DC Converters (PPT) | 2015年 10月 2日 | ||
| Application note | UCC28700 5-W USB Flyback Design Review (Rev. C) | 2014年 2月 21日 | ||
| More literature | Exposing the Inner Behavior of a Quasi-Resonant Flyback Converter | 2013年 10月 29日 |
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)。
開發板
UCC28700EVM-068 — UCC28700 評估模組
德州儀器 UCC28700EVM-068 評估模組 (EVM) 可協助設計師評估具一次側調節的 UCC28700 定電壓、定電流 PWM 的性能。5W 評估模組用於評估 USB 應用的離線變壓器。 可將 90V RMS 至 265V RMS 輸入電壓轉換為 5V 直流電，具有 1A 電流限制，適用於 USB 變壓器應用。它旨在用於評估目的，而不是最終產品。
使用指南: PDF
計算工具
SLUC408 — UCC28700 Excel 97 Design Tool
支援產品和硬體
| 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
內含資訊：
- 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
- 進行中的可靠性監測
內含資訊：
- 晶圓廠位置
- 組裝地點