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Updated at 01/11/2025 10:30:15(UTC+8)

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Description

The UC3901N is an Isolated Feedback Generator 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. This device features 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 this device 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.
An amplitude-modulation system for transformer coupling an isolated feedback error signal
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
Green product and no Sb/Br

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UC3901N Specifications

Attribute	Attribute Value

Datasheet	Datasheet
3D Model	3D Model
Mounting Style	Through Hole
Number of Pins	14 Pin
Case/Package	PDIP-14
Supply Voltage (DC)	4.50V (min)
Input Voltage (DC)	40.0 V
Output Current	35 mA
Supply Current	5 mA
Number of Positions	14 Position
Output Current (Max)	35 mA
Operating Temperature (Max)	70 ℃
Operating Temperature (Min)	0 ℃
Power Dissipation (Max)	1000 mW
Supply Voltage	4.5V ~ 40V
Supply Voltage (Max)	40 V
Supply Voltage (Min)	4.5 V
	Show
Size-Length	19.3 mm
Size-Width	6.35 mm
Size-Height	4.57 mm
Operating Temperature	0℃ ~ 70℃
Product Lifecycle Status	Active
Packaging	Cut Tape (CT)
RoHS	RoHS Compliant
Lead-Free Status	Lead Free
REACH SVHC Compliance	No SVHC
REACH SVHC Compliance Edition	2015/06/15

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