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MC33063AVP bảng dữ liệu(PDF) 9 Page - ON Semiconductor |
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MC33063AVP bảng dữ liệu(HTML) 9 Page - ON Semiconductor |
9 / 12 page MC34063A MC33063A 9 MOTOROLA ANALOG IC DEVICE DATA Figure 14. Design Formula Table 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 Vripple(pp) – 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 |
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