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UCC28951QPWRQ1 Datasheet(PDF) 55 Page - Texas Instruments |
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UCC28951QPWRQ1 Datasheet(HTML) 55 Page - Texas Instruments |
55 / 71 page QA g QB g QB d t ABSET = t 1 - t 0 Set t ABSET at resonant tank Peak and Valley t 0 t 1 t 2 t 3 t 4 t ABSET = t 4 - t 3 Miller Plateau t 5 Miller Plateau t MILLER = t 2 - t 1 t MILLER = t 5 - t 4 AB R 30.1k = W ( ) ABSET AB A T R 0.26 CS K 1.3 30.6k 5 = ´ + ´ ´ » W A ADEL AHI A 5 V R V 0.202 V R R ´ = = + A R 348 = W AHI ADEL A ADEL R V R 344 5V V ´ = » W - 55 UCC28951-Q1 www.ti.com SLUSCK4 – OCTOBER 2016 Product Folder Links: UCC28951-Q1 Submit Documentation Feedback Copyright © 2016, Texas Instruments Incorporated Based on VADEL selection, calculate RA: (148) Select the closest standard resistor value for RA: (149) Recalculate VADEL based on resistor divider selection: (150) Resistor RAB programs tABSET: (151) Select a standard resistor value for the design: (152) NOTE Once you have a prototype up and running it is recommended you fine tune tABSET at light load to the peak and valley of the resonance between LS and the switch node capacitance. In this design the delay was set at 10% load. Please refer to Figure 53. Figure 53. tABSET to Achieve Valley Switching at Light Loads |
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