34063AD データシートの表示（PDF） - Unspecified

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34063AD

DC-To-DC Converter

Unspecified 

IL34063A

Calculation

Parameter

Step-Up

Step-Down

Voltage Inverting

(Discontinuous mode)

(Continuous mode)

(Discontinuous mode)

ton/toff

(ton + toff)max

CT

IPK(switch)

RSC

CO

L(min)

NOTES:

Vout +VF-V in(min)

Vin(min) - Vsat

1/fmin

4.5x10-5ton

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

0.3/IPK(switch)

º

Ioutton

Vripple(p-p)

Vin(min) - Vsat

IPK(switch)

ton(max)

Vout +VF

Vin(min) - Vsat - Vout

1/fmin

4.5x10-5ton

2Iout(max)

0.3/IPK(switch)

IPK(switch) (ton + toff)

8Vripple(p-p)

Vin(min)-Vsat-Vout

IPK(switch)

ton(max)

êVout ê+ VF

Vin - Vsat

1/fmin

4.5x10-5ton

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

0.3/IPK(switch)

º

Ioutton

Vripple(p-p)

Vin(min) - Vsat

IPK(switch)

ton(max)

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, êVout ê = 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.

Step-up With External NPN Switch

8

7

RSC

VIN

6

5

SQ

R

Comparator

+

-

Ipk

Oscillator

1.25V

Reference

Regulator

1

Q1

2

3

4

VOUT

+

Rev. 01

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