Texas Instruments UC1901J883B
- Part Number:
- UC1901J883B
- Manufacturer:
- Texas Instruments
- Ventron No:
- 6410508-UC1901J883B
- Description:
- Isolated Feedback Generator
- Datasheet:
- uc1901
- Device typeConverters
- Vin (max) (V)40
- Vin (min) (V)4.5
- Operating temperature range (°C)-55 to 125
- Control modeVoltage mode
- RatingMilitary
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.
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