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MC34063AD Datasheet(PDF) 11 Page - HTC Korea TAEJIN Technology Co. |
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MC34063AD Datasheet(HTML) 11 Page - HTC Korea TAEJIN Technology Co. |
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11 / 11 page  DC-DC Converter Control Circuits MC34063A Design Formula Table Vin(min) - Vsat Vin(min) - Vsat Vin + Vsat fmin fmin fmin Vin(min) - Vsat Vin(min)-Vsat-Vout Vin(min) - Vsat Ipk(switch) Ipk(switch) Ipk(switch) Ipk(switch)(ton + toff) Vripple(pp) 8Vripple(pp) Vripple(pp) TERMS AND DEFINITIONS 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. Iout - Desired output current. fmin- Minimum desired output switching frequency at the selected values of Vin and IO. Vripple(p-p) – Desired peack-to-peack 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. May. 2009 - Rev. 1.2 HTC − 11 − Voltage-Inverting Vout + VF |Vout| + VF Calculation Step-Up Step-Down Co Vout + VF - Vin(min) 1 Rsc CT 0.3 / Ipk(switch) () x ton(max) 9 11 toff L(min) () x ton(max) 4.0 X 10 -5 ton 4.0 X 10 -5 ton ton ) () + 1 toff 2Iout(max) 2Iout(max) ( ton ) x ton(max) ( + 1 Iout ton 9 Iout ton ton/toff (ton/toff)max 2Iout(max) Ipk(switch) 4.0 X 10 -5 ton 0.3 / Ipk(switch) 0.3 / Ipk(switch) |
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