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See Technical Specifications

UC3901DTR

Isolated feedback generator, 0C to 70C

Manufacturer:

Texas Instruments, Inc
Mfr.Part #:

UC3901DTR
Datasheet:

UC3901DTR Datasheet (PDF)
Applications:

Feedback Generator
Current - Supply:

5mA
Voltage - Supply:

4.5V ~ 40V
Operating Temperature:

0°C ~ 70°C
EDA/CAD Models:

Request Free CAD Models for UC3901DTR

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UC3901DTR General Description

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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Key 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

Specifications

Category	Integrated Circuits (ICs)Power Management (PMIC)Power Management - Specialized	Series	-
Applications	Feedback Generator	Current - Supply	5mA
Voltage - Supply	4.5V ~ 40V	Operating Temperature	0°C ~ 70°C
Mounting Type	Surface Mount	Base Product Number	UC3901
Features	1% reference, Isolated feedback generator, Synchronizable	Operating temperature range (°C)	0 to 70
Vin (max) (V)	40	Device type	Isolated feedback generator
Rating	Catalog	feature-type	Isolated Feedback Generator
feature-minimum-operating-supply-voltage-v	4.5	feature-maximum-operating-supply-voltage-v	40
feature-maximum-supply-current-ma	10	feature-maximum-power-dissipation-mw	1000
feature-output-current-ma	35	feature-reference-voltage-v	1.5
feature-packaging	Tape and Reel	feature-rad-hard
feature-pin-count	14	feature-cecc-qualified	No
feature-esd-protection		feature-escc-qualified
feature-military	No	feature-aec-qualified	No
feature-eccn-code	EAR99	feature-svhc	Yes
feature-svhc-exceeds-threshold	No