UC3902
- 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.
技術文件
| 類型 | 標題 | 日期 | ||
|---|---|---|---|---|
| * | Data sheet | Load Share Controllers datasheet (Rev. E) | 2011年 7月 28日 | |
| User guide | UCC39002 Advanced Load-Share Controller User's Guide, HPA027A (Rev. A) | 2004年 2月 9日 | ||
| Application note | U-163 The UC3902 Load Share Controller and its Performance in Distributed Power (Rev. A) | 2002年 12月 13日 |
設計與開發
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UCC39002EVM — UCC39002 評估模組
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 (...)
| 封裝 | 針腳 | CAD 符號、佔位空間與 3D 模型 |
|---|---|---|
| PDIP (P) | 8 | Ultra Librarian |
| SOIC (D) | 8 | 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