H34063B Datasheet, PDF(3/7 Page) Hi-Sincerity Mocroelectronics – DC-to-DC Converter Integrate Circuit Devices

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H34063B Datasheet, PDF (3/7 Pages) Hi-Sincerity Mocroelectronics – DC-to-DC Converter Integrate Circuit Devices

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HI-SINCERITY

MICROELECTRONICS CORP.

Spec. No. : IC200806

Issued Date : 2008.07.07

Revised Date :

Page No. : 3/7

Application Information

Design Formula Table

Calculation

Step-Down

Step-Up

Voltage-Inverting

ton/toff

(Vout+VF)/(Vin(min) -Vsat-Vout)

(Vout+VF-Vin(min))/(Vin(min)-Vsat)

(|Vout|+VF)/(Vin(mH)-Vsat)

(ton+toff) mH

1/Fmin

4*10-5ton

1/Fmin

4*10-5ton

1/Fmin

4*10-5ton

IC(sw)

2*Iout(mH)

2*Iout(mH)(ton+toff/toff)

0.3/IC(sw)

L(min)

(Vin(min)-Vsat/Ipk(sw))*ton(mH)

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

Iout*ton/Vripple(P-P)

Vsat: Saturation voltage of the output switch.

VF: Forward voltage drop of the ringback rectifier.

The following power supply characteristics must be chosen:

Vin: Nominal input voltage.

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

Iout: Desired output current

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

Vripple(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.

H34063BP, H34063BS

HSMC Product Specification

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