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

• Topology
• Frequency (Max) (kHz)
• 5000
• UVLO thresholds on/off (V)
• 3.9/3.9
• Features
• Isolated feedback generator, 1% reference, Synchronizable
• Operating temperature range (C)
• -40 to 85

UC2901的完整型号有：UC2901D、UC2901DTR、UC2901N，以下是这些产品的关键参数及官网采购报价：

UC2901D，工作温度：-40 to 85，封装：SOIC (D)-14，包装数量MPQ：50个，MSL 等级/回流焊峰值温度：Level-2-260C-1 YEAR，引脚镀层/焊球材料：NIPDAU，TI官网UC2901D的批量USD价格：3.226（1000+）

UC2901DTR，工作温度：-40 to 85，封装：SOIC (D)-14，包装数量MPQ：2500个，MSL 等级/回流焊峰值温度：Level-2-260C-1 YEAR，引脚镀层/焊球材料：NIPDAU，TI官网UC2901DTR的批量USD价格：2.835（1000+）

UC2901N，工作温度：-40 to 85，封装：PDIP (N)-14，包装数量MPQ：25个，MSL 等级/回流焊峰值温度：N/A for Pkg Type，引脚镀层/焊球材料：NIPDAU，TI官网UC2901N的批量USD价格：3.324（1000+）