Texas Instruments UC3901 Isolated Feedback Generator UC3901QTRG3

The UC3901 Isolated Feedback Generator from Texas Instruments is designed for applications requiring feedback control across voltage isolation boundaries. It utilizes an amplitude-modulation system to couple an isolated feedback error signal via a small RF transformer or capacitor, serving as a cost-effective alternative to optical couplers. The device features an internal 1% reference voltage and an error amplifier, along with a programmable high-frequency oscillator capable of operating up to 5 MHz. The UC3901 can synchronize with an external clock, allowing for flexibility in system design. It includes a loop status monitor that provides an active-low output when the sensed error voltage is within ±10% of the reference voltage. The device operates with a supply voltage range of 4.5V to 40V and is available in various packages, including SOIC and PDIP. Its operational temperature range is from 0°C to 70°C, making it suitable for a variety of applications in power systems.