UCC2817-EP_15 Datasheet, PDF (1/24 Pages) Texas Instruments – UCC2818A-Q1 BiCMOS Power-Factor Preregulator

UCC2817-EP
UCC2818-EP
www.ti.com ........................................................................................................................................................................................... SLUS716 – DECEMBER 2008
BiCMOS POWER-FACTOR PREREGULATOR
FEATURES
1
•2 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-µA Typical Start-Up Current
• Low-Power BiCMOS Operation
• 12-V to 17-V Operation
SUPPORTS DEFENSE, AEROSPACE,
AND MEDICAL APPLICATIONS
• Controlled Baseline
• One Assembly/Test Site
• One Fabrication Site
• Available in Military (–55°C/125°C)
Temperature Range⁽¹⁾
• Extended Product Life Cycle
• Extended Product-Change Notification
• Product Traceability
D, DW, N, or PW PACKAGE
(TOP VIEW)
GND 1
PKLMT 2
CAOUT 3
CAI 4
MOUT 5
IAC 6
VAOUT 7
VFF 8
16 DRVOUT
15 VCC
14 CT
13 SS
12 RT
11 VSENSE
10 OVP/EN
9 VREF
(1) Additional temperature ranges are available - contact factory
DESCRIPTION/ORDERING INFORMATION
The UCC2817 and UCC2818 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 with TI's BiCMOS process, the UCC2817 and UCC2818 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 UCC2817 offers an on-chip shunt regulator with low start-up current suitable for applications utilizing a
bootstrap supply. The UCC2818 is intended for applications with a fixed supply (V_CC).
The devices are available in a 16-pin D package.
T_A = T_J
–55°C to 125°C
SOIC – D
ORDERING INFORMATION
PACKAGE ⁽¹⁾
ORDERABLE PART NUMBER
Reel
UCC2818MDREP
TURN-ON THRESHOLD
10.2 V
(1) Package drawings, standard packing quantities, thermal data, symbolization, and PCB design guidelines are available at
www.ti.com/sc/package.
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.
Unitrode is a trademark of Texas Instruments.
2
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, Texas Instruments Incorporated