UCC
2806
0
www.ti.com
..............................................................................................................................................................
SLUS837A – JUNE 2008 – REVISED JULY 2009
Natural Interleaving™
Transition-Mode PFC Controller With Improved Audible Noise
Immunity
1
NATURAL INTERLEAVING FEATURES
SYSTEM FEATURES
•
•
•
•
•
Improved Audible Noise Performance
Soft Start on Overvoltage
Integrated Brownout
Improved Efficiency and Design Flexibility
over Traditional, Single-Phase Continuous
Conduction Mode (CCM)
Input Filter and Output Capacitor Current
Cancellation:
– Reduced current ripple for higher system
reliability and smaller bulk capacitor
– Reduced EMI filter size
Enables Use of Low-Cost Diodes without
Extensive Snubber Circuitry
Improved Light-Load Efficiency
Improved Transient Response
Complete System-Level Protection
1-A Source/1.8-A Sink Gate Drivers
•
Phase Management Capability
•
FailSafe OVP with Dual Paths Prevents Output
Over-Voltage Conditions Caused by
Voltage-Sensing Failures
•
Sensorless Current Shaping Simplifies Board
Layout and Improves Efficiency
•
Inrush Safe Current Limiting:
– Prevents MOSFET conduction during
inrush
– Eliminates reverse recovery events in
output rectifiers
23
•
•
•
•
•
•
•
•
•
•
•
400 VDC
EMI
Filter
–
+
VCC
85-265VAC
ZCDA
GDA
CS
VINAC ZCDB
UCC28061
TSET
PWMCNTL
VSENSE
COMP
PHB
VREF
GDB
APPLICATIONS
Power Good to
downstream converter
HVSEN
AGND PGND
100-W to 800-W Power Supplies
Gaming
D to A Set Top Boxes
Adapters
LCD, Plasma and DLP™ TVs
Home Audio Systems
5
P
OUT
= 600 W
V
OUT
= 400 V
Capacitor Ripple Current (A)
Typical Application Circuit
4
1-Phase TM
3
1-Phase CCM
2
2-Phase TM Interleave
1
70
120
170
Input Voltage (V)
220
270
Ripple Current Reduction
1
2
3
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas
Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
DLP is a trademark of Texas Instruments.
Natural Interleaving is a trademark of Texas Instuments.
Copyright © 2008–2009, Texas Instruments Incorporated
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
TI [ TEXAS INSTRUMENTS ]
