UC2902
- 2.7-V to 20-V Operation
- 8-Pin Package
- Requires Minimum Number of External Components
- Compatible with Existing Power Supply Designs
Incorporating Remote Output Voltage Sensin - Differential Share Bus
- Precision Current Sense Amplifier (40 Gain)
- UVLO (Undervoltage Lockout) Circuitry
- User Programmable Share Loop Compensation
- APPLICATIONS
- Paralelled Power Supplies
The UC3902 load share controller is an 8-pin device that balances the current drawn from independent, paralleled power supplies. Load sharing is accomplished by adjusting each supplies’ output current to a level proportional to the voltage on a share bus.
The master power supply, which is automatically designated as the supply that regulates to the highest voltage, drives the share bus with a voltage proportional to its output current. The UC3902 trims the output voltage of the other paralleled supplies so that they each support their share of the load current. Typically, each supply is designed for the same current level although that is not necessary for use with the UC3902. By appropriately scaling the current sense resistor, supplies with different output current capability can be paralleled with each supply providing the same percentage of their output current capability for a particular load.
A differential line is used for the share bus to maximize noise immunity and accommodate different voltage drops in each power converter’s ground return line. Trimming of each converter’s output voltage is accomplished by injecting a small current into the output voltage sense line, which requires a small resistance (typically 20 Ω to 100 Ω) to be inserted.
技術資料
| 種類 | タイトル | 最新の英語版をダウンロード | 日付 | |||
|---|---|---|---|---|---|---|
| * | データシート | Load Share Controllers データシート (Rev. E) | 2011年 7月 28日 | |||
| ユーザー・ガイド | UCC39002 Advanced Load-Share Controller User's Guide, HPA027A (Rev. A) | 2004年 2月 9日 | ||||
| アプリケーション・ノート | U-163 The UC3902 Load Share Controller and its Performance in Distributed Power (Rev. A) | 2002年 12月 13日 | ||||
| アプリケーション・ノート | U-129 UC3907 Load Share IC Simplifies Parallel Power Supply Design | 1999年 9月 5日 |
設計および開発
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UCC39002EVM — UCC39002 評価モジュール
The UCC39002 is an advanced, high-performance load-share controller that provides all the necessary functions to parallel multiple independent power supplies or dc-to-dc modules. This load-share circuit is based upon the automatic master/slave architecture utilized in the UC3902 and UC3907 (...)
| 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 |
|---|---|---|
| PDIP (P) | 8 | Ultra Librarian |
| SOIC (D) | 8 | Ultra Librarian |
購入と品質
- RoHS
- REACH
- デバイスのマーキング
- リード端子の仕上げ / ボールの原材料
- MSL 定格 / ピーク リフロー
- MTBF/FIT 推定値
- 使用原材料
- 認定試験結果
- 継続的な信頼性モニタ試験結果
- ファブの拠点
- 組み立てを実施した拠点