H34063AS datasheet(3/7 Pages) HSMC

3 / 7 page

HI-SINCERITY

MICROELECTRONICS CORP.

Spec. No. : IC200407

Issued Date : 2003.04.01

Revised Date : 2005.03.25

Page No. : 3/7

H34063AP, H34063AS

HSMC Product Specification

Application Information

Design Formula Table

Calculation

Step-Down

Step-Up

Voltage-Inverting

on/toff

out+VF)/(Vin(min) -Vsat-Vout)(Vout+VF-Vin(min))/(Vin(min)-Vsat)(|Vout|+VF)/(Vin(max)-Vsat)

on+toff) max

1/F

min

1/F

min

1/F

min

4*10

-5t

4*10

-5t

4*10

-5t

C(sw)

2*I

out(max)

2*I

out(max)(ton+toff/toff)2*Iout(max)(ton+toff/toff)

0.3/I

C(sw)

0.3/I

C(sw)

0.3/I

C(sw)

(min)

in(min)-Vsat/Ipk(sw))*ton(max)

pk(sw)*(ton+toff))/(8*Vripple(P-P))Iout*ton/Vripple(P-P)

out*ton/Vripple(P-P)

sat: Saturation voltage of the output switch.

F: Forward voltage drop of the ringback rectifier.

The following power supply characteristics must be chosen:

in: Nominal input voltage.

out: Desired output voltage. |Vout|=1.25*(1+RB/RA)

out: Desired output current

min: Minimum desired output switching frequency at the selected values for Vin and Iout.

ripple(P-P): Desired peak to peak output ripple voltage in practice, the calculated value will need to be increased due to

the capacitor equivalent series resistance and board layout. The ripple voltage should be kept to a low value since it

will directly effect the line and load regulation.

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