Product Summary

The UC3854AN is a High Power Factor Preregulator. The UC3854AN provides active power factor correction for power systems that otherwise would draw non-sinusoidal current from sinusoidal power lines. The UC3854AN implements all the control functions necessary to build a power supply capable of optimally using available power-line current while minimizing line-current distortion. To do this, the UC3854AN contains a voltage amplifier, an analog multiplier/divider, a current amplifier, and a fixed-frequency PWM. In addition, the UC3854AN contains a power MOSFET compatible gate driver, 7.5V reference, line anticipator, load-enable comparator, low-supply detector, and over-current comparator.

Parametrics

UC3854AN absolute maximum ratings: (1)Supply Voltage VCC: 35V; (2)GT Drv Current, Continuous: 0.5A; (3)GT Drv Current, 50% Duty Cycle: 1.5A; (4)Input Voltage, VSENSE, VRMS: 11V; (5)Input Voltage, ISENSE, Mult Out: 11V; (6)Input Voltage, PKLMT: 5V; (7)Input Current, RSET, IAC, PKLMT, ENA: 10mA; (8)Power Dissipation: 1W; (9)Storage Temperature: –65℃ to +150℃; (10)Lead Temperature (Soldering, 10 Seconds): +300℃.

Features

UC3854AN features: (1)Control Boost PWM to 0.99 Power Factor; (2)Limit Line Current Distortion To <5%; (3)World-Wide Operation Without Switches; (4)Feed-Forward Line Regulation; (5)Average Current-Mode Control; (6)Low Noise Sensitivity; (7)Low Start-Up Supply Current; (8)Fixed-Frequency PWM Drive; (9)Low-Offset Analog Multiplier/Divider; (10)1A Totem-Pole Gate Driver; (11)Precision Voltage Reference.

Diagrams

UC3854AN block diagram

Image Part No Mfg Description Data Sheet Download Pricing
(USD)		 Quantity
UC3854AN
UC3854AN
Texas Instruments
Power Factor Correction ICs Enhanced High Power Factor Preregulator
Data Sheet
0-1: $2.41
1-25: $2.20
25-100: $1.76
100-250: $1.54
UC3854ANG4
UC3854ANG4
Texas Instruments
Power Factor Correction ICs Enhanced High Power Factor Preregulator
Data Sheet
0-1: $2.47
1-25: $2.03
25-100: $1.78
100-250: $1.55