FAC34063AF datasheet(7/7 Pages) FS

7 / 7 page

2007. 5. 20

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FAC34063AP/AF

Revision No : 1

Calculation

Parameter

Step-Up

(Discontinuous mode)

Step-Down

(Continuous mode)

Voltage Inverting

(Discontinuous mode)

ton/toff

Vout +VF-V in(min)

Vout +VF

IVout + VF

Vin(min) - Vsat

Vin(min) - Vsat - Vout

Vin - Vsat

(ton + toff)max

1/fmin

4.5x10-5ton

IPK(switch)

2Iout(max)[(ton/toff)+1]

2Iout(max)

2Iout(max)[(ton/toff)+1]

RSC

0.3/IPK(switch)

Ioutton

IPK(switch) (ton + toff)

Ioutton

≡

Vripple(p-p)

8Vripple(p-p)

≡

Vripple(p-p)

L(min)

Vin(min) - Vsat

Vin(min)-Vsat-Vout

Vin(min) - Vsat

IPK(switch)

ton(max)

IPK(switch)

ton(max)

IPK(switch)

ton(max)

NOTES:

Vsat = Saturation voltage of the output switch

VF = Forward voltage drop of the output rectifier

THE FOLLOWING POWER SUPPLY CHARACTERISTICS MUST BE CHOSEN:

Vin = Nominal input voltage

Vout = Desired output voltage, | V |

out = 1.25(1+R2/R1)

Iout = Desired output current

fmin = Minimum desired output switching frequency at the selected values of Vin and lo

Vripple = Desired peak to peak output ripple voltage. In practice, the calculated capacitor value will and to be

increased due to its equivalent series resistance and board layout. The ripple voltage should be kept to a low

value since it will directly affect the line and load regulation.

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