PJ34063 查看數據表（PDF） - Unspecified

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PJ34063

Dc To Converter Controller

Unspecified 

PJ34063

Dc To Converter Controller

Table : Design Formula

Calculation

ton

toff

(ton+toff) max

CT

Ipk(switch)

Rsc

L (min)

Co

Step-Up

Vout+VF -Vin(min)

VCC(min)-Vsat-Vout

1

f min

4.0×10-5 ton

2Iout(max)

ton

toff

+ 1

0.3/IPK(switch)



Vin(min)− Vsat

Ipk (switch)



=

ton(max)

 9

Ioutton

Vripple( pp)



Step-Down

VOUT+VF

VCC(min)-Vsat-Vout

1

f min

4.0×10-5 ton

2Iout(max)

0.3/IPK(switch)



Vin(min) − Vsat − Vout

Ipk (switch )



=

ton(max)



Ipk

(switch)(ton + toff

8Vripple( pp )

)



Voltage-Inverting

│Vout│ +VF

VCC + Vsat

1

f min

4.0×10-5 ton

2Iout(max)



ton

toff

+ 1

0.3/IPK(switch)



Vin(min) − Vsat

Ipk (switch)



=

ton(max)



9

Ioutton

Vripple( pp)



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+ R2 )

R1

♦ 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.

7-8

2002/01.rev.A

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