UCC29910A_15 Datasheet, PDF (1/23 Pages) Texas Instruments – Buck PFC Controller

UCC29910A
www.ti.com
Buck PFC Controller
Check for Samples: UCC29910A
SLUSAK8A – MAY 2011 – REVISED JUNE 2011
FEATURES
1
• Buck Power Factor Correction for High
Efficiency Across Line
• Low Off-Line Startup Current, With SmartStart
Algorithm for Fast Startup With Soft-Start
• Compatible With Resistive or Pass Transistor
Fed Startup from the AC Line
• Low Power SmartBurst Mode for Standby and
Light-Load Conditions
• Current Sense Inputs for PFC control and
Overload Protection
• Line Sense UVLO
• Sense and Drive Control for External Startup
Depletion Mode FET
• Latching Fault Input Pin
APPLICATIONS
• High Efficiency AC-DC Adapters
• Low Profile and High Density Adapters
DESCRIPTION
The UCC29910A Buck Power Factor Correction
(PFC) controller provides a relatively flat
high-efficiency performance across universal line for
designers requiring a high power factor (>0.9) and
wishing to meet the requirements of IEC 61000-3-2.
Based on a buck topology, inherent inrush current
limiting eliminates the need for additional
components. With a typical bus voltage of 84 V, the
topology is ideally suited for use with low voltage
stress downstream regulation/isolation power trains,
such as half-bridge stages controlled by the
UCC29900, (Texas Instruments Literature Number,
SLUS923). This combination offers low
common-mode noise generation allowing reduced
filtering and exceptionally high conversion efficiency.
The UCC29910A incorporates AC line UVLO and
controlled soft start for fast start-up. Enhanced
light-load efficiency is achieved through advanced
management algorithms for best-in-class no-load and
light-load performance.
SIMPLIFIED APPLICATION DIAGRAM
VAC
EMC
FILTER
HS BULK
SENSE
VBULK
BIAS
SUPPLY
DRIVER
4
1
10 13
LINESNS VDD TST PFCDRV
11 NC
UCC29910APW
9 BIASSNS
CS 3
CS 5
12 BIASCTRL
VBULK 2
NC REFIN VSS FAULT
7
6
14
8
1
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.
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.
Copyright © 2011, Texas Instruments Incorporated