AP34063 Ver la hoja de datos (PDF) - Anachip Corporation
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AP34063 Datasheet PDF : 10 Pages
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Universal DC/DC Converter
AP34063
Design Formula Table
Calculation
ton /toff
(ton + toff)
toff
ton
CT
Ipk(switch)
Rsc
L(min)
CO
Step-Up
Vout +VF -Vin(min)
Vin(min) - Vsat
1/f
ton +toff
ton
+1
toff
(ton +toff)-toff
4.0×10-5ton
2Iout(max) (ton /toff +1)
0.3/Ipk(switch)
(Vin(min) – Vsat )
Ipk(switch)
ton(max)
Iout ton
9
Vripple(pp)
Step-Down
Voltage-Inverting
vout +vF
vin(min) -vsat - vout
1/f
Ivout l+vF
Vin -vsat
1/f
ton +toff
ton +toff
ton
+1
toff
ton
+1
toff
(ton +toff)-toff
4.0×10-5ton
2Iout(max)
(ton +toff)-toff
4.0×10-5ton
2Iout(max) (ton /toff +1)
0.3/Ipk(switch)
0.3/Ipk(switch)
(Vin(min) – Vsat -Vout)
ton(max)
Ipk(switch)
(Vin(min) – Vsat )
Ipk(switch)
ton(max)
Ipk(switch) (toff +ton )
8Vripple(pp)
Iout ton
9
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.
Anachip Corp.
www.anachip.com.tw
10/10
Rev.A5 Feb.10, 2004
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