UCC2817 Datasheet | Texas Instruments

Features - 1 Controls Boost Preregulator to Near-Unity Power Factor - Limits Line Distortion - World Wide Line Operation - Over-Voltage 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 - Up to 18-V Operation - Frequency Range 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 UCCx817 and UCCx818 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 UCCx817 and UCCx818 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) UCC2817, UCC2818, UCC3817, UCC3818 SOIC (16) PDIP (16) 3.91 mm × 9.9 mm 7.5 mm × 10.3 mm 6.35 mm × 19.3 mm (1) For all available packages, see the orderable addendum at the end of the data sheet. Block Diagram VCC 15 OVP/EN 10 16 V (FOR UCC2817 ONLY) 7.5 V REFERENCE 9 VREF SS 13 VAOUT 7 VSENSE 11 7.5...