AP34063 查看數據表（PDF） - Diodes Incorporated.

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AP34063

UNIVERSAL DC/DC CONVERTER

Diodes Incorporated. 

Design Formula Table

AP34063

UNIVERSAL DC/DC CONVERTER

Calculation

Step-Up

Step-Down

Voltage-Inverting

ton / toff

Vout + VF -Vin (min)

Vin (min) - Vsat

vout + vF

vin(min) - vsat - vout

Ivout l + vF

Vin - vsat

( ton + toff )

1/f

ton + toff

1/f

ton + toff

1/f

ton + toff

toff

ton

ton

ton

+1

+1

+1

toff

toff

toff

ton

CT

Ipk (switch)

Rsc

( ton +toff ) - toff

4.0×10-5ton

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

0.3 / Ipk (switch)

( ton +toff ) - toff

4.0×10-5ton

2Iout (max)

0.3 / Ipk (switch)

( ton + toff ) - toff

4.0×10-5ton

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

0.3 / Ipk (switch)

L (min)

( Vin (min) – Vsat )

Ipk (switch)

ton (max)

( Vin (min) – Vsat -Vout )

ton (max)

Ipk (switch)

( Vin (min) – Vsat )

Ipk (switch)

ton (max)

Iout ton

Ipk (switch) ( toff + ton )

Iout ton

CO

9

9

Vripple (pp)

8Vripple (pp)

Vripple (pp)

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 Io.

Vripple(pp) - Desired peak-to-peak output ripple voltage. In practice, the calculated capacitor 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.

AP34063 Rev. 5

DS31004

8 of 11

www.diodes.com

JULY 2009

© Diodes Incorporated

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