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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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400DAFBA2 датащи(PDF) 33 Page - ON Semiconductor |
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400DAFBA2 датащи(HTML) 33 Page - ON Semiconductor |
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33 / 47 page  NCP12400 www.onsemi.com 33 Figure 62. Leaving the Quiet−Skip Mode during Load Transient Figure 63. Quiet−Skip Timing Diagram − option VFB Time DRV Enters skip Enters skip Exits skip after quiet timer expires Crossing the transient enhancement level stops the quiet skip immediately Vskip(in) Vskip(out) Vskip(tran) tquiet tquiet Time DRV DRV pulses does not start because V FB<Vskip(in) VFB time Vskip(out) Vskip(in) DRV VFB time Vskip(out) Vskip(in) tquiet tquiet DRV time Vskip(out) Vskip(in) tquiet tquiet 1 2 3 Sequence of events 1 ; 2 ; 3 starts the quiet skip mode The DRV pulses does not start even when VFB >Vskip(out) in the quiet skip mode VFB Vskip(tran) nP,skip nP,skip nP,skip When V FB >Vskip (tran) the quiet skip mode immediately finishes Quiet skip mode forces at least n p,skip pulses in skip mode burst nP,skip nP,skip Running just above skip mode with fsw =fosc(min) time time time |
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