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MC33063AD Scheda tecnica(PDF) 11 Page - ON Semiconductor |
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MC33063AD Scheda tecnica(HTML) 11 Page - ON Semiconductor |
11 / 15 page MC34063A, MC33063A, SC34063A, SC33063A, NCV33063A http://onsemi.com 11 Calculation Step−Up Step−Down Voltage−Inverting ton/toff Vout ) VF * Vin(min) Vin(min) * Vsat Vout ) VF Vin(min) * Vsat * Vout |Vout| ) VF Vin * Vsat (ton + toff) 1 f 1 f 1 f toff ton ) toff ton toff ) 1 ton ) toff ton toff ) 1 ton ) toff ton toff ) 1 ton (ton + toff) − toff (ton + toff) − toff (ton + toff) − toff CT 4.0 x 10−5 ton 4.0 x 10−5 ton 4.0 x 10−5 ton 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) Ipk(switch) ton(max) (Vin(min) * Vsat * Vout) Ipk(switch) ton(max) (Vin(min) * Vsat) Ipk(switch) ton(max) CO 9 Ioutton Vripple(pp) Ipk(switch)(ton ) toff) 8Vripple(pp) 9 Ioutton 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, 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. NOTE: For further information refer to Application Note AN920A/D and AN954/D. |Vout| + 1.25 1 ) R2 R1 Figure 17. Design Formula Table |
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