Product Summary

The UC2854DW is a high power factor preregulator. The UC2854DW 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. To do this, the UC2854DW contains a voltage amplifier, an analog multiplier/divider, a current amplifier, and a fixed-frequency PWM. In addition, the UC2854DW contains a power MOSFET compatible gate driver, 7.5V reference, line anticipator, load-enable comparator, low-supply detector, and over-current comparator. The UC2854DW uses average current-mode control to accomplish fixedfrequency current control with stability and low distortion. Unlike peak current-mode, average current control accurately maintains sinusoidal line current without slope compensation and with minimal response to noise transients.

Parametrics

UC2854DW 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

UC2854DW 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

UC2854DW pin connection

Image Part No Mfg Description Data Sheet Download Pricing
(USD)
Quantity
UC2854DW
UC2854DW

Texas Instruments

Power Factor Correction ICs High Power-Factor Preregulator

Data Sheet

0-1: $2.41
1-25: $2.20
25-100: $1.76
100-250: $1.54
UC2854DWG4
UC2854DWG4

Texas Instruments

Power Factor Correction ICs High Power-Factor Preregulator

Data Sheet

0-1: $2.47
1-25: $2.03
25-100: $1.78
100-250: $1.55
UC2854DWTR
UC2854DWTR

Texas Instruments

Power Factor Correction ICs HP Factor Pre-Reg

Data Sheet

0-1490: $1.13
1490-2000: $1.06
2000-5000: $1.05
UC2854DWTRG4
UC2854DWTRG4

Texas Instruments

Power Factor Correction ICs High Power-Factor Preregulator

Data Sheet

0-1490: $1.13
1490-2000: $1.06
2000-5000: $1.05