Datasheet Texas Instruments UC1854L
| Manufacturer | Texas Instruments |
| Series | UC1854 |
| Part Number | UC1854L |
Datasheets
UCx854 High-Power Factor Preregulator datasheet
PDF, 949 Kb, Revision: A, File published: Dec 16, 2016
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Status
| Lifecycle Status | Obsolete (Manufacturer has discontinued the production of the device) |
| Manufacture's Sample Availability | No |
Packaging
| Pin | 20 |
| Package Type | L |
Replacements
| Replacement | UC1854J |
| Replacement Code | P |
Parametrics
| Control Method | CCM |
| Duty Cycle(Max)(%) | 95 |
| Operating Temperature Range(C) | -55 to 125 |
| Package Group | CDIP |
| Package Size: mm2:W x L (PKG) | See datasheet (CDIP) |
| Rating | Military |
| Special Features | Average Current Mode Enable |
| UVLO Thresholds On/Off(V) | 16/10 |
Eco Plan
| RoHS | Not Compliant |
| Pb Free | No |
Application Notes
- U-134 UC3854 Controlled Power Factor Correction Circuit DesignPDF, 346 Kb, File published: 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 - DN-39E Optimizing Performance in UC3854 Power Factor Correction ApplicationsPDF, 277 Kb, File published: 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 - DN-41 Extend Current Transformer RangePDF, 37 Kb, File published: 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. - AC Requirements for Power Factor Correction CircuitsPDF, 29 Kb, File published: Mar 28, 2002
This technical brief identifies the recommended range of IAC for each of the devices within the UCC3854 family of PFC controllers. - Accurate PWM Duty Cycle ClampPDF, 58 Kb, File published: 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.
Model Line
Series: UC1854 (6)
Manufacturer's Classification
- Semiconductors > Space & High Reliability > Power Management Products > Offline and Isolated DC/DC Controller and Converter
