KK34063AD datasheet(7/11 Pages) KODENSHI

Part #	KK34063AD

Description	DC-TO-DC CONVERTER CONTROL CIRCUITS

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Manufacturer	KODENSHI [KODENSHI_AUK CORP.]

Direct Link	http://www.kodenshi.co.kr

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Calculation

Parameter

Step-Up

(Discontinuous mode)

Step-Down

(Continuous mode)

Voltage Inverting

(Discontinuous mode)

ton/toff

Vout +VF-V in(min)

Vout +VF

⎢V

out ⎢+ VF

Vin(min) - Vsat

Vin(min) - Vsat - Vout

Vin - Vsat

(ton + toff)max

1/fmin

CT

4.5x10

-5t

on

4.5x10

-5t

on

4.5x10

-5t

on

IPK(switch)

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

2Iout(max)

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

RSC

0.3/IPK(switch)

CO

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, ⎢Vout ⎢ = 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

VOUT

+

RSC

VIN

S

R

Q

Q1

Ipk

Oscillator

1.25V

Reference

Regulator

-

+

Comparator

8

1

2

3

4

5

6

7

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KK34063AD Datasheet(PDF) 7 Page - KODENSHI_AUK CORP.

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