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MC34063ACD Datasheet(PDF) 9 Page - STMicroelectronics |
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MC34063ACD Datasheet(HTML) 9 Page - STMicroelectronics |
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9 / 15 page  Calculation Parameter Step-Up (Discontinuos mode) Step-Down (Continuos mode) Voltage Inverting (Discontinuos mode) ton/toff Vout + VF − Vin(min) Vin(min) − Vsat Vout + VF Vin(min) − Vsat − Vout | Vout| + VF Vin − Vsat (ton +toff)max 1/fmin 1/fmin 1/fmin CT 4.5x10 -5ton 4.5x10 -5ton 4.5x10 -5ton IPK(switch) 2Iou t(max)[(ton/toff)+1] 2I out(max) 2I out(max)[(ton/toff)+1] RSC 0.3/IPK(switch) 0.3/IPK(switch) 0.3/IPK(switch) CO ≅ Iout ton Vripple(p−p) IPK (switch) (ton + toff ) 8Vripple(p−p) ≅ Iout ton Vripple (p−p) L(min) Vin(min) − Vsat IPK (switch) ton (max) Vin(min) − Vsat − Vout IPK (switch) ton (max) Vin(min) − Vsat IPK (switch) ton (max) NOTES: Vsat = Saturation voltage of the output switch VF = Foward 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 = Desired peak to peak output ripple voltage. In practice, the calculaed capacitor value will and 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. Step-up With External NPN Switch MC34063A 9/15 |
Similar Part No. - MC34063ACD |
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Similar Description - MC34063ACD |
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