Enhanced Product Isolated Feedback Generator - UC2901-EP


Enhanced Product Isolated Feedback Generator



The UC2901 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, UC2901 features an amplitude modulation system that allows a loop error signal to be coupled with a small RF transformer or capacitor.

The programmable, high-frequency oscillator within the UC2901 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 an SMPS.

An additional feature is a status monitoring circuit that 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.

Because these devices also can be used as a DC driver for optical couplers, the benefits of 4.5 V to 40 V supply operation, a 1% accurate reference, and a high-gain general-purpose amplifier offer advantages, even though an AC system may not be desired.


  • Controlled Baseline
    • One Assembly/Test Site, One Fabrication Site
  • Extended Temperature Performance of –55°C to 125°C
  • Enhanced Diminishing Manufacturing Sources (DMS) Support
  • Enhanced Product-Change Notification
  • Qualification Pedigree(1)
  • 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 5 MHz
  • Modulator Synchronizable to an External Clock
  • Loop Status Monitor

(1) Component qualification in accordance with JEDEC and industry standards to ensure reliable operation over an extended temperature range. This includes, but is not limited to, Highly Accelerated Stress Test (HAST) or biased 85/85, temperature cycle, autoclave or unbiased HAST, electromigration, bond intermetallic life, and mold compound life. Such qualification testing should not be viewed as justifying use of this component beyond specified performance and environmental limits.

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Parametrics Compare all products in Offline and Isolated DC/DC Controller and Converter

Control Method
Vin (Min) (V)
Vin (Max) (V)
Duty Cycle (Max) (%)
Frequency (Max) (kHz)
UVLO Thresholds On/Off (V)
Operating Temperature Range (C)
Package Group
Package Size: mm2:W x L (PKG)
UC2901-EP UC2901
  Amplitude modulation   
40    40   
50    50   
5000    5000   
  AM system for isolated feedback error signal
1% reference
HiRel Enhanced Product    Catalog   
-55 to 125    -40 to 85   
14SOIC: 52 mm2: 6 x 8.65(SOIC)    See datasheet (PDIP)
14SOIC: 52 mm2: 6 x 8.65(SOIC)   

Other qualified versions of UC2901-EP

Version Part Number Definition
Catalog UC2901 TI's standard catalog product