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MC33063AVPG Datasheet(PDF) 10 Page - ON Semiconductor |
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MC33063AVPG Datasheet(HTML) 10 Page - ON Semiconductor |
10 / 13 page MC34063A, MC33063A, NCV33063A http://onsemi.com 10 Calculation Step−Up Step−Down Voltage−Inverting ton/toff Vout ) VF * Vin(min) V in(min) * Vsat Vout ) VF V in(min) * Vsat * Vout |Vout| ) VF V in * Vsat (ton + toff) 1 f 1 f 1 f toff ton ) toff ton t off ) 1 ton ) toff ton t off ) 1 ton ) toff ton t off ) 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) 2I out(max) ton t off ) 1 2I out(max) 2I out(max) ton t off ) 1 Rsc 0.3/Ipk(switch) 0.3/Ipk(switch) 0.3/Ipk(switch) L(min) (V in(min) * Vsat) I pk(switch) t on(max) (V in(min) * Vsat * Vout) I pk(switch) t on(max) (V in(min) * Vsat) I pk(switch) t on(max) CO 9 Ioutton V ripple(pp) I pk(switch) (ton ) toff) 8V ripple(pp) 9 Ioutton V ripple(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 15. Design Formula Table |
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