UC2901Q

The UC2901Q from Unitrode is an isolated feedback generator IC, serving as a low-cost alternative to optical couplers. It utilizes an amplitude-modulation system for coupling feedback error signals across a voltage isolation boundary using a small RF transformer or capacitor.

This device features an internal carrier oscillator usable up to 5MHz, which allows for the use of smaller, less expensive transformers. It can also be synchronized to an external clock source, making it suitable for system clocks or SMPS switching frequencies. The UC2901Q includes an internal 1% reference and error amplifier, along with a loop status monitor that provides an active-low output when the sensed error voltage is within ±10% of the reference.

With an operating voltage range of 4.5V to 40V and an operating temperature range of -40°C to 85°C, the UC2901Q is designed for robust performance. It is supplied in a 20-PLCC (9x9) or 20-LCC (J-Lead) package, suitable for surface mounting.

Key specifications include a typical current consumption of 5mA. The absolute maximum ratings indicate an input supply voltage of up to 40V, with specific limits for reference output current, driver output currents, and status indicator voltage and current.