UCC28050, UCC28051
UCC38050, UCC38051
SLUS515F−SEPTEMBER 2002 − REVISED MARCH 2009
TRANSITION MODE PFC CONTROLLER
FEATURES
D
Transition Mode PFC Controller for Low
D
D
D
D
D
D
D
D
D
Implementation Cost
Industry Pin Compatibility With Improved
Feature Set
Improved Transient Response With
Slew-Rate Comparator
Zero Power Detect to Prevent OVP During
Light Load Conditions
Accurate Internal V
REF
for Tight Output
Regulation
Two UVLO Options
Overvoltage Protection (OVP),
Open-Feedback Protection and Enable
Circuits
±
750-mA Peak Gate Drive Current
Low Start-Up and Operating Currents
Lead (Pb)-Free Packages
APPLICATIONS
D
Switch-Mode Power Supplies for Desktops,
D
D
Monitors, TVs and Set Top Boxes (STBs)
AC Adapter Front-End Power Supplies
Electronic Ballasts
DESCRIPTION
The UCC38050 and UCC38051 are PFC
controllers for low-to-medium power applications
requiring compliance with IEC 1000-3-2 harmonic
reduction standard. It is designed for controlling a
boost preregulator operating in transition mode
(also referred to as boundary conduction mode or
critical conduction mode operation). It features a
transconductance voltage amplifier for feedback
error processing, a simple multiplier for
generating a current command proportional to the
input
voltage,
a
current-sense
(PWM)
comparator, PWM logic and a totem-pole driver
for driving an external FET.
SIMPLIFIED APPLICATION DIAGRAM
UCC38050
1
2
VO_SNS VCC
COMP
DRV
GND
4
CS
ZCD
7
6
5
8
3
MULTIN
UDG−02125
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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 Texas Instruments
standard warranty. Production processing does not necessarily include
testing of all parameters.
Copyright
2009, Texas Instruments Incorporated
www.ti.com
1
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