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AP34063 Datasheet(PDF) 8 Page - Diodes Incorporated |
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AP34063 Datasheet(HTML) 8 Page - Diodes Incorporated |
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8 / 11 page  AP34063 UNIVERSAL DC/DC CONVERTER AP34063 Rev. 5 8 of 11 JULY 2009 DS31004 www.diodes.com © Diodes Incorporated 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 1/f 1/f toff ton + toff ton + toff ton + toff ton +1 ton +1 ton +1 toff toff toff ton ( ton +toff ) - toff ( ton +toff ) - toff ( ton + toff ) - toff CT 4.0 ×10-5t on 4.0 ×10-5t on 4.0 ×10-5t on Ipk (switch) 2Iout (max) (ton / toff +1) 2Iout (max) 2Iout (max) (ton / toff +1) Rsc 0.3 / Ipk (switch) 0.3 / Ipk (switch) 0.3 / Ipk (switch) L (min) ( Vin (min) – Vsat ) ton (max) ( Vin (min) – Vsat -Vout ) ton (max) ( Vin (min) – Vsat ) ton (max) Ipk (switch) Ipk (switch) Ipk (switch) CO 9 Iout ton Ipk (switch) ( toff + ton ) 9 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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