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參數資料
| 型號： | 5962-8944101VCA |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 模擬信號調理 |
| 英文描述： | SPECIALTY ANALOG CIRCUIT, CDIP14 |
| 封裝： | CERAMIC, DIP-14 |
| 文件頁數： | 1/12頁 |
| 文件大小： | 591K |
| 代理商： | 5962-8944101VCA |
UC1901
UC2901
UC3901
Isolated Feedback Generator
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
The UC1901 family is designed to solve many of the problems associ-
ated 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 er-
ror 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 switch-
ing 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.
UC1901 SIMPLIFIED SCHEMATICNovember S
SLUS279A - November 1998 - Revised January 2010
UDG-98080
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