IR1176
3 -PLL Naturalfrequency:
ω n =2 π fn(KHz)= √ Ichpump(uA) x Kvco_ac(KHz/V) / C(nF)
Choose Cfsuchthat Cf=C/16
4 -PLL Damping factorcalculations:
P = π E-3 x Rf (KOhms) x C(nF) x fn(KHz)
TypicalvalueforPis0.707.(Criticallydamped)
5 -Advance tim ing:
- 6
Tadv(nsec) = RADV (KOhms)*10 + 10
W here RADV isresistancefrom RADV1 orRADV2 to ground.
+ =90
Example C:RADV=10Kohms willresultin Tadv=10*10- 6=106 nsec.
6-Dead time calculations:
+ (For (For
Td(nsec)=0.69*Rdt(KOhms)*Cdt(pF) ? )+0.15) Vdd=5 Vdd=5V)
W here Rdt is resistance between pins DTIN1 and DTOUT1 or DTIN2 and
DTOUT2.Cdtiscapacitancefrom DTIN1 or DTIN2 to ground.
Example D: Rd=2KW and Cdt=100pF will result in Td=148.35nsec.
Fig. 4 PLL loop filter component definitions
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