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UC1901JUCN/a200avaiIsolated Feedback Generator
UC1901JN/a12avaiIsolated Feedback Generator
UC1901JUC?N/a12avaiIsolated Feedback Generator
UC1901LTIN/a58avaiIsolated Feedback Generator


UC1901J ,Isolated Feedback GeneratorMAXIMUM RATINGS (Note 1)Input Supply Voltage, VIN . . . . . . . . . . . . . . . . . . . . . . . . . ..
UC1901J ,Isolated Feedback GeneratorFEATURES DESCRIPTION• An Amplitude-Modulation System for The UC1901 family is designed to solve man ..
UC1901J ,Isolated Feedback GeneratorUC1901UC2901UC3901Isolated Feedback Generator
UC1901L ,Isolated Feedback GeneratorFEATURES DESCRIPTION• An Amplitude-Modulation System for The UC1901 family is designed to solve man ..
UC1903J ,Quad Supply and Line MonitorELECTRICAL CHARACTERISTICSUnless otherwise stated, these specifications apply for T = –55°C to +125 ..
UC1903L/883B ,Quad Supply and Line MonitorFEATURES DESCRIPTION• Inputs for Monitoring up to Four SeparateThe UC1903 family of quad supply and ..
ULN2001 ,HIGH-VOLTAGE/ HIGH-CURRENT DARLINGTON ARRAYSULN2001A-ULN2002A® ULN2003A-ULN2004ASEVEN DARLINGTON ARRAYS. SEVEN DARLINGTONS PER PACKAGE.OUTPUT C ..
ULN2001A ,SEVEN DARLINGTON ARRAYSULN2001A-ULN2002A® ULN2003A-ULN2004ASEVEN DARLINGTON ARRAYS. SEVEN DARLINGTONS PER PACKAGE.OUTPUT C ..
ULN2001D ,Seven darlington arraysABSOLUTE MAXIMUM RATINGSSymbol Parameter Value UnitV Output Voltage 50 VoV Input Voltage (for ULN20 ..
ULN2001D1013TR ,SEVEN DARLINGTON ARRAYSULN2001A-ULN2002A® ULN2003A-ULN2004ASEVEN DARLINGTON ARRAYS. SEVEN DARLINGTONS PER PACKAGE.OUTPUT C ..
ULN2002 ,SEVEN DARLINGTON ARRAYSULN2001A-ULN2002A® ULN2003A-ULN2004ASEVEN DARLINGTON ARRAYS. SEVEN DARLINGTONS PER PACKAGE.OUTPUT C ..
ULN2002A ,HIGH VOLTAGE, HIGH CURRENT DARLINGTON TRANSISTOR ARRAYSULN2001A-ULN2002A® ULN2003A-ULN2004ASEVEN DARLINGTON ARRAYS. SEVEN DARLINGTONS PER PACKAGE.OUTPUT C ..


UC1901J-UC1901L
Isolated Feedback Generator
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 familyis designedto solve manyof the problems associ-
ated with closinga feedback control loop acrossa voltage isolation
boundary. Asa stable and reliable alternativetoan optical coupler, these
devices featurean amplitude modulation system which allowsa 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 useof smaller, less expensive transformers which can readily builtto meet the isolation requirementsof today's line-operated power
systems. As an alternativeto RF operation, the external clock inputto
these devices allows synchronizationtoa system clockorto the switch-
ing frequency of a SMPS. additional featureisa status monitoring circuit which providesan active-
low output when the sensed error voltageis within ±10%of the reference.
The DRIVERA output, DRIVERB output, and STATUS output are disabled
until the input supply has reacheda sufficient levelto allow proper operation the device.
Since these devices can alsobe usedasa DC driver for optical couplers,
the benefitsof 4.5to 40V supply operation,a 1% accurate reference, anda
high gain general purpose amplifier offer advantages even though an AC
system may notbe desired.
UC1901 SIMPLIFIED SCHEMATICNovember S
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