Unitrode UC1901
The UC1901 family is designed to solve many of the problems associated with closing a feedback control loop across a voltage isolation boundary. 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.| Part No. | UC1901 |
|---|---|
| Datasheet | UC1901 Download |
| Manufacturer |  Unitrode |
| Description | Isolated Feedback Generator |
| Buy | Stock & Price |
FEATURES
● 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
DESCRIPTION
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. 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 activelow 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...
