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SLUS755 – APRIL 2007
8-Pin Continuous Conduction Mode (CCM) PFC Controller
FEATURES
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8-pin Solution Without Sensing Line Voltage
Reduces External Components
Wide-Range Universal AC Input Voltage
Fixed 65-kHz Operating Frequency
Maximum Duty Cycle of 97%
Output Over/Under-Voltage Protection
Input Brown-Out Protection
Cycle-by-Cycle Peak Current Limiting
Open Loop Detection
Low-Power User Controlled Standby Mode
DESCRIPTION
The UCC28019 8-pin active Power Factor Correction
(PFC) controller uses the boost topology operating in
Continuous Conduction Mode (CCM). The controller
is suitable for systems in the 100 W to >2 kW range
over a wide-range universal AC line input. Startup
current during under-voltage lockout is less than 200
µA. The user can control low power standby mode
by pulling the VSENSE pin below 0.77 V.
Low-distortion wave-shaping of the input current
using average current mode control is achieved
without input line sensing, reducing the Bill of
Materials component count. Simple external
networks allow for flexible compensation of the
current and voltage control loops. The switching
frequency is internally fixed and trimmed to better
than ±5% accuracy at 25°C. Fast 1.5-A gate peak
current drives the external switch.
Numerous system-level protection features include
peak current limit, soft over-current, open-loop
detection,
input
brown-out,
output
over/under-voltage, a no-power discharge path on
VCOMP, and overload protection on ICOMP.
Soft-Start limits boost current during start-up. A
trimmed internal reference provides accurate
protection thresholds and regulation set-point. An
internal clamp limits the gate drive voltage to 12.5 V.
APPLICATIONS
CCM Boost Power Factor Correction Power
Converters in the 100 W to >2 kW Range
Server and Desktop Power Supplies
Telecom Rectifiers
Industrial Electronics
Home Electronics
CONTENTS
3
Device Information
10
Application Information
12
Design Example
23
43
TYPICAL APPLICATION DIAGRAM
EMI Filter
LINE
INPUT
Bridge
Rectifier
V
OUT
–
+
1
2
3
4
GND
ICOMP
ISENSE
VINS
GATE
VCC
VSENSE
VCOMP
8
7
6
5
Auxilary
Supply
R
load
UCC28019
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 © 2007, Texas Instruments Incorporated
TI [ TEXAS INSTRUMENTS ]
