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SLUS828B – DECEMBER 2008 – REVISED APRIL 2009
8-Pin Continuous Conduction Mode (CCM) PFC Controller
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FEATURES
8-pin Solution Reduces External Components
Wide-Range Universal AC Input Voltage
Fixed 65-kHz Operating Frequency
Maximum Duty Cycle of 98% (typ.)
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 UCC28019A 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.
Start-up 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 external
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 peak gate current drives the
external switch.
Numerous system-level protection features include
peak current limit, soft over-current, open-loop
detection,
input
brown-out,
and
output
over/under-voltage. 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.
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APPLICATIONS
CCM Boost Power Factor Correction Power
Converters in the 100 W to 2 kW Range
Digital TV
Home Electronics
White Goods and Industrial Electronics
Server and Desktop Power Supplies
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
UCC28019A
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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 © 2008–2009, Texas Instruments Incorporated
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