Texas Instruments UC3901 Isolated Feedback Generator UC3901DW

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 through 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, making it suitable for various system designs, including those using switch-mode power supplies. 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 over a supply voltage range of 4.5V to 40V and is available in a 16-pin SOIC package, with an operating temperature range of 0°C to 70°C. Engineers may consider the UC3901 for projects that require reliable feedback mechanisms in isolated environments, particularly in power supply applications.