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KK34063AD Datasheet(PDF) 7 Page - KODENSHI_AUK CORP. |
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KK34063AD Datasheet(HTML) 7 Page - KODENSHI_AUK CORP. |
7 / 11 page Calculation Parameter Step-Up (Discontinuous mode) Step-Down (Continuous mode) Voltage Inverting (Discontinuous mode) ton/toff Vout +VF-V in(min) Vout +VF ⎢V out ⎢+ VF Vin(min) - Vsat Vin(min) - Vsat - Vout Vin - Vsat (ton + toff)max 1/fmin 1/fmin 1/fmin CT 4.5x10 -5t on 4.5x10 -5t on 4.5x10 -5t on 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) CO Ioutton IPK(switch) (ton + toff) Ioutton ≡ Vripple(p-p) 8Vripple(p-p) ≡ Vripple(p-p) L(min) Vin(min) - Vsat Vin(min)-Vsat-Vout Vin(min) - Vsat IPK(switch) ton(max) IPK(switch) ton(max) IPK(switch) ton(max) NOTES: 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, ⎢Vout ⎢ = 1.25(1+R2/R1) Iout = Desired output current fmin = Minimum desired output switching frequency at the selected values of Vin and lo Vripple = Desired peak to peak output ripple voltage. In practice, the calculated 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 VOUT + RSC VIN S R Q Q1 Ipk Oscillator 1.25V Reference Regulator - + Comparator 8 1 2 3 4 5 6 7 7 KK34063A |
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