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UCC28056DBVR Datasheet(PDF) 10 Page - Texas Instruments |
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UCC28056DBVR Datasheet(HTML) 10 Page - Texas Instruments |
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10 / 44 page  10 UCC28056 SLUSD37 – OCTOBER 2017 www.ti.com Product Folder Links: UCC28056 Submit Documentation Feedback Copyright © 2017, Texas Instruments Incorporated 7 Detailed Description 7.1 Overview UCC28056 is designed to partner with UCC25630x to control a complete PFC+LLC isolated off-Line power supply system delivering more than 300W. The combined power supply is designed to meet tough modern efficiency and standby power requirements without the need for an Auxiliary Flyback converter and with no need to switch off the PFC under light load conditions. It allows designers to meet modern green power standards with a simpler and cheaper power supply. UCC28056 contains a number of features designed to maximize operating efficiency across the entire range of Line and Load. A versatile CrM/DCM control algorithm allows UCC28056 to operate in transition mode at full power and then transition seamlessly into DCM at reduced load without compromising Line current harmonics or power factor. It will operate at maximum frequency (Transition mode) when delivering full load and then automatically reduce switching frequency, moving to DCM operation, when delivering reduced load for maximum efficiency. Light load efficiency and standby power are further enhanced by transitioning automatically to a burst mode of operation when delivering less than 10% load. During the burst OFF periods, UCC28056 powers down most of its internal circuits to minimize controller power consumption. UCC28056 includes a comprehensive list of fault protection features. These include cycle-by-cycle current limit, over-current protection, dual independent output over-voltage protection, Line Brown-out, Over-temperature protection and supply under-voltage lockout (UVLO). Quantised 7-level line voltage feed-forward ensures that the loop gain is almost independent of line voltage, to ease design of the output voltage control loop. A non-linear error amplifier greatly improves the response to large steps in load without compromising steady state Line current harmonics. |
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