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UC2854 Datasheet Preview

UC2854 Datasheet

High-Power Factor Preregulator

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UC1854, UC2854, UC3854
SLUS336A – JUNE 1998 – REVISED DECEMBER 2016
UCx854 High-Power Factor Preregulator
1 Features
1 Control Boost PWM to 0.99 Power Factor
• Limit Line-Current Distortion to < 5%
• World-Wide Operation Without Switches
• Feedforward Line Regulation
• Average Current-Mode Control
• Low Noise Sensitivity
• Low Startup Supply Current
• Fixed-Frequency PWM Drive
• Low-Offset Analog Multiplier and Divider
• 1-A Totem-Pole Gate Driver
• Precision Voltage Reference
2 Applications
• Offline AC-to-DC Converters
• Medical, Industrial, Telecom, and IT Power
Supplies
• Uninterruptible Power Supplies (UPS)
• Appliances and White Goods
3 Description
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. To do this, the UC1854 contains a
voltage amplifier, an analog multiplier and divider, a
current amplifier, and a fixed-frequency PWM.
In addition, the UC1854 contains a power MOSFET-
compatible gate driver, 7.5-V reference, line
anticipator, load-enable comparator, low-supply
detector, and overcurrent comparator.
The UC1854 uses average current-mode control to
accomplish fixed-frequency 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.
The high reference voltage and high oscillator
amplitude of the UC1854 minimize noise sensitivity
while fast PWM elements permit chopping
frequencies above 200 kHz. The UC1854 is used in
single-phase and three-phase systems with line
voltages that vary from 75 V to 275 V and line
frequencies across the 50-Hz to 400-Hz range. To
reduce the burden on the circuitry that supplies power
to this device, the UC1854 features low starting
supply current.
These devices are available packaged in 16-pin
plastic and ceramic dual in-line packages, and a
variety of surface-mount packages.
Device Information(1)
PART NUMBER
PACKAGE
BODY SIZE (NOM)
SOIC (16)
7.50 mm × 10.30 mm
UC1854, UC2854, PLCC (20)
UC3854
CDIP (16)
8.96 mm × 8.96 mm
6.92 mm × 19.56 mm
PDIP (16)
6.35 mm × 19.30 mm
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
Block Diagram
Line
Input
EMI
Filter
+
VOUT
400 VDC
VREF
VCC
VREF
10
ENA
254
PKLMT MULTOUT ISENSE
6 IAC
8 VRMS
UC3854
3 16
CAOUT GTDRV
VSENSE 11
VAOUT 7
VCC
VCC
15
CT
SS
RSET
GND
VREF
14 13 12
1
9
VREF
Copyright © 2016, Texas Instruments Incorporated
1
An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,
intellectual property matters and other important disclaimers. PRODUCTION DATA.




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UC2854 Datasheet Preview

UC2854 Datasheet

High-Power Factor Preregulator

No Preview Available !

UC1854, UC2854, UC3854
SLUS336A – JUNE 1998 – REVISED DECEMBER 2016
www.ti.com
Table of Contents
1 Features .................................................................. 1
2 Applications ........................................................... 1
3 Description ............................................................. 1
4 Revision History..................................................... 2
5 Device Comparison Table..................................... 3
6 Pin Configuration and Functions ......................... 3
7 Specifications......................................................... 5
7.1 Absolute Maximum Ratings ...................................... 5
7.2 ESD Ratings.............................................................. 5
7.3 Recommended Operating Conditions....................... 6
7.4 Thermal Information .................................................. 6
7.5 Electrical Characteristics........................................... 6
7.6 Typical Characteristics .............................................. 8
8 Detailed Description ............................................ 10
8.1 Overview ................................................................. 10
8.2 Functional Block Diagram ....................................... 10
8.3 Feature Description................................................. 11
8.4 Device Functional Modes........................................ 11
9 Application and Implementation ........................ 12
9.1 Application Information............................................ 12
9.2 Typical Application .................................................. 12
10 Power Supply Recommendations ..................... 16
11 Layout................................................................... 16
11.1 Layout Guidelines ................................................. 16
11.2 Layout Example .................................................... 17
12 Device and Documentation Support ................. 18
12.1 Documentation Support ........................................ 18
12.2 Related Links ........................................................ 18
12.3 Receiving Notification of Documentation Updates 18
12.4 Community Resources.......................................... 18
12.5 Trademarks ........................................................... 18
12.6 Electrostatic Discharge Caution ............................ 18
12.7 Glossary ................................................................ 18
13 Mechanical, Packaging, and Orderable
Information ........................................................... 18
4 Revision History
NOTE: Page numbers for previous revisions may differ from page numbers in the current version.
Changes from Original (June 1998) to Revision A
Page
• Added Applications section, Device Information table, Pin Configuration and Functions section, Specifications
section, ESD Ratings table, Recommended Operating Conditions table, Detailed Description section, Application
and Implementation section, Power Supply Recommendations section, Layout section, Device and Documentation
Support section, and Mechanical, Packaging, and Orderable Information section................................................................ 1
• Added Thermal Information table ........................................................................................................................................... 6
• Changed IAC value in both Multiplier Output vs Multiplier Inputs images from mA to µA. ................................................... 8
2 Submit Documentation Feedback
Copyright © 1998–2016, Texas Instruments Incorporated
Product Folder Links: UC1854 UC2854 UC3854


Part Number UC2854
Description High-Power Factor Preregulator
Maker etcTI
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