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.

• 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

• Frequency (Max) (kHz)
• 5000
• UVLO thresholds on/off (V)
• 3.9/3.9
• Supply voltage (Max) (V)
• 40
• Features
• Isolated feedback generator, 1% reference, Synchronizable
• Operating temperature range (C)
• -55 to 125

UC1901-SP的完整型号有：5962-8944101VCA，以下是这些产品的关键参数及官网采购报价：

5962-8944101VCA，工作温度：-55 to 125，封装：CDIP (J)-14，包装数量MPQ：1个，MSL 等级/回流焊峰值温度：N/A for Pkg Type，引脚镀层/焊球材料：SNPB，TI官网5962-8944101VCA的批量USD价格：153.153（1000+）

UC1843BEVM-CVAL UC1843B-SP 电流模式 PWM 控制器评估模块

UC1843BEVM-CVAL 使用 UC1843A-SP、INA901-SP、LM139AQML-SP 和 UC1901-SP 创建具有电流检测和过流标志的隔离型反馈反激式转换器。UC1843A-SP 用于切换反激式转换器的低侧 MOSFET，并为输出端提供电压和电流。UC1901-SP 可检测输出电压并实现隔离式反馈闭环。INA901-SP 检测提供给 LM139AQML-SP 的输入电流以产生过流标志。

UCx901 Family TINA-TI Average Reference Design

航天器总线电压范围为额定 28V 至 100V 以上不等，一般用于高功率商用通信卫星。本参考设计展示了航天级 50W 隔离型中间总线转换器的示例，并实现了过流保护 (OCP) 限制功能。本设计采用 INA901-SP 耐辐射型电流监控器、LM139AQML-SP 四路比较器和 UC1901-SP，以创建具有电流感应和过流标志的隔离型反馈反激式器件，即 UC1843A-SP 电流模式 PWM 控制器，用于切换反激式转换器的低侧 MOSFET，并向输出提供电压和电流，UC1901-SP 可感应输出电压并实现隔离式反馈闭环。INA901-SP 可感应提供给 LM139AQML-SP (...)