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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技术文档
类型 | 标题 | 下载最新的英语版本 | 日期 | |||
---|---|---|---|---|---|---|
* | 数据表 | Isolated Feedback Generator 数据表 (Rev. A) | 2010年 1月 13日 | |||
应用手册 | DN-19 A Simple Isolation Amplifier Using the UC1901 | 1999年 9月 5日 | ||||
应用手册 | DN-33 Optocoupler Feedback Drive Techniques Using the UC3901 and UC3903 | 1999年 9月 5日 | ||||
应用手册 | The UC1901 Simplifies the Problem of Isolated Feedback in Switching Regulators | 1999年 9月 5日 |
设计和开发
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UCx901 Family TINA-TI Average Reference Design
UCx901 Family TINA-TI Transient Reference Design
封装 | 引脚 | 下载 |
---|---|---|
PDIP (N) | 14 | 查看选项 |
SOIC (D) | 14 | 查看选项 |
SOIC (DW) | 16 | 查看选项 |
订购和质量
- RoHS
- REACH
- 器件标识
- 引脚镀层/焊球材料
- MSL 等级/回流焊峰值温度
- MTBF/时基故障估算
- 材料成分
- 鉴定摘要
- 持续可靠性监测
- 制造厂地点
- 封装厂地点