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LCS700-708 Scheda tecnica(PDF) 18 Page - Power Integrations, Inc. |
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LCS700-708 Scheda tecnica(HTML) 18 Page - Power Integrations, Inc. |
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18 / 26 page ![]() Rev. B 062011 18 LCS700-708 www.powerint.com PI-6470-062811 0 50 100 100 400 300 200 Time ( s) 0 -5 24.0 23.9 24.1 Figure 26. Zoom in of Last Few Switching Cycles of Burst Pulse Train of Figure 24. The Switching Frequency of the Last Few Cycles is f STOP, 383 kHz in This Case (arrow). The Ringing in V HB After Switching Stops, is the Primary Inductance Ringing with the MOSFET Capacitance. Higher f START will decrease the load threshold at which bursting begins, increase the input voltage threshold and decrease the output ripple in burst mode, but will increase the burst repetition rate, which may introduce audible noise in some combinations of line and load. The choice of f START will affect the large signal transient response where the HiperLCS goes in and out of burst mode. |
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