AP34063 datasheet(8/11 Pages) DIODES

8 / 11 page

AP34063

UNIVERSAL DC/DC CONVERTER

AP34063 Rev. 5

8 of 11

JULY 2009

DS31004

www.diodes.com

Design Formula Table

Calculation

Step-Up

Step-Down

Voltage-Inverting

ton / toff

Vout + VF -Vin (min)

vout + vF

Ivout l + vF

Vin (min) - Vsat

vin(min) - vsat - vout

Vin - vsat

( ton + toff )

1/f

toff

ton + toff

ton

toff

ton

( ton +toff ) - toff

( ton + toff ) - toff

4.0

×10-5t

4.0

×10-5t

4.0

×10-5t

Ipk (switch)

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

2Iout (max)

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

Rsc

0.3 / Ipk (switch)

L (min)

( Vin (min) – Vsat )

ton (max)

( Vin (min) – Vsat -Vout )

ton (max)

( Vin (min) – Vsat )

ton (max)

Ipk (switch)

Iout ton

Ipk (switch) ( toff + ton )

Iout ton

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.

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