PJ34063CS datasheet(7/8 Pages) ETC

7 / 8 page

PJ34063

Dc To Converter Controller

7-8

2002/01.rev.A

Table : Design Formula

Calculation

Step-Up

Step-Down

Voltage-Inverting

ton

toff

Vout+VF -Vin(min)

VCC(min)-Vsat-Vout

VOUT+VF

VCC(min)-Vsat-Vout

│Vout│ +V

VCC + Vsat

(ton+toff) max

min

4.0×10

-5 ton

4.0×10

-5 ton

4.0×10

-5 ton

Ipk(switch)

2Iout(max)









toff

ton

2Iout(max)









toff

ton

Rsc

0.3/IPK(switch)

L (min)

(max)

)

(

(min)

ton

switch

Ipk

Vsat

Vin











−

(max)

)

(

(min)

ton

switch

Ipk

Vout

Vsat

Vin







−

−

(max)

)

(

(min)

ton

switch

Ipk

Vsat

Vin







−













)

(

Vripple

Ioutton











+

)

(

)

)(

(

Vripple

toff

ton

switch

Ipk













)

(

Vripple

Ioutton

TERMS AND DEFINITIONS

♦ Vsat = Saturation Voltage of the output switch.

♦ VF = Forward Voltage drop of the rectifier.

The following power supply characteristics must be chosen:

♦ Vin= Normal input voltage

♦ Vout: Desied Output voltage, |Vout|=1.25 (1+

)

♦ Iout : Desired output current.

♦ fmin : Minimum desired output switching frequency at the selected values for Vin and.Io.

♦ Vripple(p-p): Desired peak-to-peak output ripple voltage. in practice, the calculated capaitor value will need 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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