Datasheet Texas Instruments UC3854QTR — Datenblatt

Hersteller	Texas Instruments
Serie	UC3854
Artikelnummer	UC3854QTR

Datenblätter

Anwendungshinweise

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  U-134 UC3854 Controlled Power Factor Correction Circuit Design
  PDF, 346 Kb, Datei veröffentlicht: Sep 5, 1999
  The UC1854 provides active power factor correction for power systems that otherwise would draw non-sinusoidal current from sinusoidal power lines. This device implements all the control functions necessary to build a power supply capable of optimally using available power-line current while minimizing line-current distortion. This application note describes the concepts and design of a boost prere
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  DN-39E Optimizing Performance in UC3854 Power Factor Correction Applications
  PDF, 277 Kb, Datei veröffentlicht: Sep 5, 1999
  The performance of the UC3854 Power-Factor Correction IC in the 250W application example has been evaluated using a precision PFC/THD instrument. The result was a power factor of 0.999 and Total Harmonic Distortion (THD) of 3.81%, measured to the 50th line frequency harmonic at nominal line and full load. Users should get similar results at these conditions. as well as over most line and load rang
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  DN-41 Extend Current Transformer Range
  PDF, 37 Kb, Datei veröffentlicht: Sep 5, 1999
  The problems with self reset of current transformers for unipolar pulse applications can be overcome with simple forced-reset techniques derived from magnetic amplifiers. Duty factors above 90% are achievable with these techniques. This design note describes a circuit configured for forced reset and a configuration that generates a negative voltage from the current transformer.
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  AC Requirements for Power Factor Correction Circuits
  PDF, 29 Kb, Datei veröffentlicht: Mar 28, 2002
  This technical brief identifies the recommended range of IAC for each of the devices within the UCC3854 family of PFC controllers.
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  Accurate PWM Duty Cycle Clamp
  PDF, 58 Kb, Datei veröffentlicht: Jan 25, 2002
  Power supply applications using current sense transformers require a duty cycle clamp on the pulse width modulator (PWM) to ensure transformer reset. Not all PWMs come with a duty cycle clamp presenting a problem for the power supply designer. This application note shows how to implement a duty cycle clamp by using a simple delay circuit.

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Herstellerklassifikation

• Semiconductors > Power Management > Offline and Isolated DC/DC Controllers and Converters > Power Factor Correction