IR1175 View Datasheet(PDF) - International Rectifier

Part Name

Description

Manufacturer

IR1175

Synchronous Rectifier Driver

International Rectifier 

ADVANCE INFORMATION

IR1175

3 - PLL Natural frequency:

ωn =2πfn(KHz)= √ Ichpump(uA) x Kvco_ac(KHz/V) / C(nF)

Choose Cf such that Cf=C/16 (Minimum value for Cf=470pF)

4 - PLL Damping factor calculations:

P = πE-3 x Rf (KOhms) x C(nF) x fn(KHz)

Typical value for P is 0.707. (Critically damped)

5 - Advance timing:

Tadv(nsec) = RADV (KOhms)*10 - 10

Where RADV is resistance from RADV1 or RADV2 to ground.

Example C: RADV=10Kohms will result in Tadv=10*10 - 10 =90 nsec .

6- Dead time calculations:

Td(nsec)=0.69*Rdt(KOhms)*Cdt(pF) + 5 (For Vdd=5 V)

Where Rdt is resistance between pins DTIN1 and DTOUT1 or DTIN2 and

DTOUT2. Cdt is capacitance from DTIN1 or DTIN2 to ground.

Example D: Rdt=10Kohms and Cdt=22pF will result in: Td=156.8 nsec

Fig. 4 PLL loop filter component definitions

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