UCC3817A Datasheet | Texas Instruments

Features - 1 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 Bi CMOS Operation - 12-V to 17-V Operation - Frequency Range of 6 k Hz to 220 k Hz 2 Applications - PC Power - Consumer Electronics - Lighting - Industrial Power Supplies - IEC6100-3-2 pliant Supplies Less Than 300 W 3 Description The UCC3817A and the UCC3818A family 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 Bi CMOS process, the UCC3817A/UCC3818A 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, lowoffset (±2 m V) current amplifier to reduce distortion at light load conditions. Device Information(1) PART NUMBER PACKAGE BODY SIZE (NOM) SOIC (16) 4.90 mm × 3.91 mm UCCx81x A PDIP (16) 19.30 mm × 6.35 mm TSSOP (16) 5.00 mm × 4.40 mm (1) For all available packages, see the orderable addendum at the end of the data sheet. OVP/EN 10 SS 13 VAOUT 7 VSENSE 11 7.5...