TI's Next-Generation Power Management IC Maximizes Energy in Multi-Kilowatt Systems

TI's Next-Generation Power Management IC Maximizes Energy in Multi-Kilowatt Systems

November 27, 2007

Two-Phase, Single-Chip Interleaving Power Factor Controller
Simplifies Design, Increases Energy Performance and System
Reliability


    DALLAS, Nov. 26 /Xinhua-PRNewswire/ -- Texas
Instruments Incorporated (TI) (NYSE: TXN) introduced today
the industry's first single-chip, interleaved power factor
correction (PFC) control circuit for multi-kilowatt
communications, server and industrial systems. The new
UCC28070 two-phase, average current-mode controller allows
designers to simplify power design, increase system
reliability and achieve a greater than 0.9 power factor
rating, which improves energy efficiency. See:
http://www.ti.com/UCC28070-pr .  

    (Logo:
http://www.xprn.com.cn/xprn/sa/20061107170439-20-min.jpg )

    "The increasing need for better energy management
is apparent in every area of our lives, especially at the
business operations level. The magnitude of power
requirements for data centers and telecom systems continues
to drive industry-wide efforts to reduce wasted energy and
improve power quality," said Bob Mammano, power
management staff technologist and TI Fellow. "Today's
announcement gives power engineers an innovative solution
that raises the bar toward more efficient power supply
control."

    Building on more than 20 years of PFC circuit
development, TI's UCC28070 continuous conduction-mode
controller provides unprecedented performance and reduces
system cost in applications where high efficiency and high
power factor requirements are important. These range from
high-end communications systems to embedded white goods
motor drives in refrigerators and air conditioners to HID
lighting ballasts.

    In line-operated systems with power levels from 75 W to
1kW and above, the UCC28070 helps reduce total harmonic
distortion, allowing today's systems to better maximize
usable outlet power and accommodate extreme variations and
disturbances in various AC line voltage levels used around
the world. 

    Meeting Strict Efficiency Requirements

    The UCC28070 helps designers meet the most stringent
efficiency requirements for multi-kilowatt power systems.
This PFC controller allows light-load phase management to
enhance a system's performance -- achieving higher
efficiency over the entire load range. Phase management
allows a system to turn on or off phases of the power
supply, so that only the phases required to power the load
are enabled.

    In a 1.2-kW system, the UCC28070 can initiate an
increase of up to 1.5-percent efficiency at a light
20-percent load condition, allowing designers to exceed
energy guidelines set forth by industry initiatives, such
as The Green Grid, Climate Savers Computing Initiative and
Project Big Green. In a 240-watt supply at 20-percent load
condition, for example, this increase in efficiency results
in a 27-percent power savings.

    System Reliability and Protection

    The device helps increase system reliability by
incorporating a unique 180 degree interleaving method,
which reduces the amount of input and output current ripple
and distributes the magnetics to improve thermal management.
Average current mode interleaving allows a system to achieve
between 50 and 100 percent reduction in ripple compared to
today's typical non-interleaved PFC architectures. 

    The UCC28070's optional programmable-frequency
dithering mode allows a designer to spread the switching
frequency over a range to minimize the generation of
electromagnetic interference (EMI). The dithering feature
helps reduce capacitor size, and it gives designers the
ability to use a smaller, less expensive EMI filter. The
UCC28070 offers several unique system control and
protection features to improve overall system reliability.
An output over-voltage protection scheme with an open-loop
detection feature safeguards the system from common circuit
board failures. Each phase current is accurately balanced
with independent current sensing to prevent excess
component heating in the device's dual-phase operation. In
addition, the UCC28070 provides under-voltage lockout,
cycle-by-cycle peak current limit, and a system
over-temperature protection feature.  

    Two-Phase Single-Chip PFC Controllers for Consumer and
High-Power Applications
In June TI introduced the UCC28060, which is the first
single-chip, transition-mode, two-phase PFC controller for
75- to 800-W applications, including consumer applications,
such as digital TVs, personal computers and entry-level
server platforms. Both the UCC28060 and UCC28070 give
designers the best options as they design power systems
that support power factor correction in end-equipment
designs. For more information on the UCC28060, visit:
http://www.ti.com/UCC28060 . 

    Available Today

    The UCC28070 is available in a 20-pin TSSOP package. It
is sampling today, with volume production scheduled for
January 2008.  Suggested resale pricing in quantities of
100 units is $2.45. An evaluation board, power factor
correction application notes and data sheets are available
at power.ti.com.

    About Texas Instruments

    Texas Instruments Incorporated provides innovative DSP
and analog technologies to meet our customers' real world
signal processing requirements.  In addition to
Semiconductor, the company includes the Education
Technology business.  TI is headquartered in Dallas, Texas,
and has manufacturing, design or sales operations in more
than 25 countries.

    Texas Instruments is traded on the New York Stock
Exchange under the symbol TXN.  More information is located
on the World Wide Web at:  http://www.ti.com 

    Please refer all reader inquiries to:  Texas
Instruments Incorporated
			           Semiconductor Group, SC-07178
				Literature Response Center
				14950 FAA Blvd.
                                           Ft. Worth, TX 
76155
				1-800-477-8924

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    For more information, please contact:

     Matt McKinney	
     Texas Instruments	
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     Heather Mills		
     GolinHarris		
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