UCC2818A-Q1 Datasheet, PDF (1/23 Pages) Texas Instruments – BiCMOS POWER-FACTOR PREREGULATOR

UCC2818A-Q1
www.ti.com
BiCMOS POWER-FACTOR PREREGULATOR
Check for Samples: UCC2818A-Q1
SLUSA21 – FEBRUARY 2010
FEATURES
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• Qualified for Automotive Applications
• Controls Boost Preregulator to Near-Unity
Power Factor
• Limits Line Distortion
• World-Wide Line Operation
• Overvoltage Protection
• Accurate Power Limiting
• Average Current Mode Control
• Improved Noise Immunity
• Improved Feed-Forward Line Regulation
• Leading Edge Modulation
• 150-mA Typical Start-Up Current
• Low-Power BiCMOS Operation
• 12-V to 17-V Operation
• Frequency Range of 6 kHz to 220 kHz
GND
PKLMT
CAOUT
CAI
MOUT
IAC
VAOUT
VFF
D PACKAGE
(TOP VIEW)
1
16
2
15
3
14
4
13
5
12
6
11
7
10
8
9
DRVOUT
VCC
CT
SS
RT
VSENSE
OVP/EN
VREF
DESCRIPTION/ORDERING INFORMATION
The UCC2818A provides all the functions necessary for active power factor corrected preregulators. The
controller achieves near unity power factor by shaping the ac input line current waveform to correspond to that of
the ac input line voltage. Average current mode control maintains stable, low distortion sinusoidal line current.
Designed in Texas Instrument’s BiCMOS process, the UCC2818A offers new features such as lower start-up
current, lower power dissipation, overvoltage protection, a shunt UVLO detect circuitry, a leading-edge
modulation technique to reduce ripple current in the bulk capacitor and an improved, low-offset (±2 mV) current
amplifier to reduce distortion at light load conditions.
The UCC2818A PFC controller is directly pin-for-pin compatible with the UCC2818 devices. Only the output
stage of UCC2818A has been modified to allow use of a smaller external gate drive resistor values. For some
power supply designs where an adequately high enough gate drive resistor can not be used, the UCC2818A
offers a more robust output stage at the cost of increasing the internal gate resistances. The gate drive of the
UC2818A, however, remains strong at ±1.2 A of peak current capability.
UCC2818A is intended for applications with a fixed supply (V_CC). It is available in the 16-pin D package.
T_J = T_A
–40°C to 125°C
SOIC – D
ORDERING INFORMATION⁽¹⁾
PACKAGE ⁽²⁾
ORDERABLE PART NUMBER
Reel of 2500
UCC2818AQDRQ1
TOP-SIDE MARKING
2818AQ
(1) For the most current package and ordering information, see the Package Option Addendum at the end of this document, or see the TI
web site at www.ti.com.
(2) Package drawings, thermal data, and symbolization are available at www.ti.com/packaging.
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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 © 2010, Texas Instruments Incorporated