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IR1176 Datasheet(PDF) 7 Page - International Rectifier |
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IR1176 Datasheet(HTML) 7 Page - International Rectifier |
7 / 12 page www.irf.com 7 IR1176 Fig. 4 PLL loop filter component definitions 4 -PLL Dampi ng f actorcalculations: P = ππE-3 x Rf (KOhms) x C(nF) x fn(KHz) TypicalvalueforPis0.707.(Criticallydamped) 5 -Advanceti m i ng: Tadv(nsec) = RADV (KOhms)*10 - 10 W here RADV isresistancefrom RADV1 orRADV2 toground. Exampl e C:RADV=10Kohms willr esulti n Tadv=10*10-10=90nsec. 6-Dead ti me calculations: Td(nsec)=0.69*Rdt(KOhms)*Cdt(pF) + 5 (For Vdd=5 V) W hereRdt is resistance between pins DTIN1 and DTOUT1 or DTIN2 and DTOUT2.Cdtiscapacitancefrom DTIN1 or DTIN2 t oground. 3 -PLL Naturalfrequency: ω ωn =2ππfn(KHz)= √√ Ichpump(uA) x Kvco_ac(KHz/V) / C(nF) Choose Cfsuchthat Cf=C/16 + 6=106 nsec. Example D: Rd=2KW and Cdt=100pF will result in Td=148.35nsec. + 6 Td(nsec)=0.69*Cdt(pF)*(Rdt(KΩ)+0.15) (For Vdd=5V) |
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