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UC2844N Datasheet(PDF) 31 Page - Texas Instruments |
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UC2844N Datasheet(HTML) 31 Page - Texas Instruments |
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31 / 56 page  frequency (Hz) 1 10 100 1000 10000 100000 -40 -20 0 20 40 60 80 D003 frequency (Hz) 1 10 100 1000 10000 100000 -180 -135 -90 -45 0 D001 D004 GCLOSED :s; = H OPEN :s;× lCTR×ROPTO RLED p×lRCOMPp RFBG p×F 1 1 + ks×C COMPp × RCOMPp oG × nRCOMPz +@ 1 s × CCOMPz A RFBU r 31 UC1842, UC2842, UC3842, UC1843, UC2843, UC3843 UC1844, UC2844, UC3844, UC1845, UC2845, UC3845 www.ti.com SLUS223D – APRIL 1997 – REVISED AUGUST 2016 Product Folder Links: UC1842 UC2842 UC3842 UC1843 UC2843 UC3843 UC1844 UC2844 UC3844 UC1845 UC2845 UC3845 Submit Documentation Feedback Copyright © 1997–2016, Texas Instruments Incorporated (59) The final closed-loop bode plots are show in Figure 28 and Figure 29. The converter achieves a crossover frequency of approximately 1.8 kHz and has a phase margin of approximately 67o. TI recommends checking the loop stability across all the corner cases including component tolerances to ensure system stability. Figure 28. Converter Closed-Loop Bode Plot – Gain Figure 29. Converter Closed-Loop Bode Plot – Phase 9.2.3 Application Curves Figure 30. Primary Side MOSFET Drain to Source Voltage at 240-V AC Input (100 V/div) Figure 31. Primary Side MOSFET Drain to Source Voltage at 120-V AC Input (100 V/div) |
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