UCC2817-EP

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 PKLMT CAOUT CAI MOUT IAC VAOUT VFF 1 2 3 4 5 6 7 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, ...