UC3901
- An Amplitude-Modulation System for Transformer Coupling an Isolated Feedback Error Signal
- Low-Cost Alternative to Optical Couplers
- Internal 1% Reference and Error Amplifier
- Internal Carrier Oscillator Usable to 5MHz
- Modulator Synchronizable to an External Clock
- Loop Status Monitor
The UC1901 family is designed to solve many of the problems associated with closing a feedback control loop across a voltage isolation boundary. As a stable and reliable alternative to an optical coupler, these devices feature an amplitude modulation system which allows a loop error signal to be coupled with a small RF transformer or capacitor.
The programmable, high-frequency oscillator within the UC1901 series permits the use of smaller, less expensive transformers which can readily be built to meet the isolation requirements of today's line-operated power systems. As an alternative to RF operation, the external clock input to these devices allows synchronization to a system clock or to the switching frequency of a SMPS.
An additional feature is a status monitoring circuit which provides an active-low output when the sensed error voltage is within ±10% of the reference. The DRIVERA output, DRIVERB output, and STATUS output are disabled until the input supply has reached a sufficient level to allow proper operation of the device.
Since these devices can also be used as a DC driver for optical couplers, the benefits of 4.5 to 40V supply operation, a 1% accurate reference, and a high gain general purpose amplifier offer advantages even though an AC system may not be desired.
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技術文件
類型 | 標題 | 日期 | ||
---|---|---|---|---|
* | Data sheet | Isolated Feedback Generator datasheet (Rev. A) | 2010年 1月 13日 | |
Application note | DN-19 A Simple Isolation Amplifier Using the UC1901 | 1999年 9月 5日 | ||
Application note | DN-33 Optocoupler Feedback Drive Techniques Using the UC3901 and UC3903 | 1999年 9月 5日 | ||
Application note | The UC1901 Simplifies the Problem of Isolated Feedback in Switching Regulators | 1999年 9月 5日 |
設計與開發
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UCx901 Family TINA-TI Average Reference Design
封裝 | 針腳 | CAD 符號、佔位空間與 3D 模型 |
---|---|---|
PDIP (N) | 14 | Ultra Librarian |
SOIC (D) | 14 | Ultra Librarian |
SOIC (DW) | 16 | 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