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SP6122 Datasheet(PDF) 17 Page - Sipex Corporation |
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SP6122 Datasheet(HTML) 17 Page - Sipex Corporation |
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17 / 19 page  17 Rev. 7/16/03 SP6122 Low Voltage, Micro 8, PFET, Buck Controller © Copyright 2003 Sipex Corporation SP6122 Non-Synchronous Buck Design Calculator STEADY STATE CALCULATION Enter Values Calculation Results Formula VIN = Input Voltage (V) 3.3 D = Duty Cycle 0.58 = VOUT/VIN VOUT = Output Voltage (V) 1.9 Iripple = Ripple Current (A) 1.22 = (VIN-VOUT)*VOUT/(Fs*1000*L*0.000001*VIN) Fs = Switching Frequency (kHz) 300 Ipeak = Peak Inductor Current (A) 4.61 = IOUT+Iripple/2 IOUT = Load Current (A) 4 Output Ripple (mV) 42.75 = Iripple*ESRout L = Inductance (µH) 2.2 Iin = Max Input Current (A) 2.56 = IOUT*D/0.9 ESRin = Input Capacitor ESR (mΩ) 5 Max Input Ripple (mV) 96.99 = IOUT*ESRin+Iin*(1-D)/(Fs*CIN*0.000001) CIN = Input Capacitance (µF) 47 Iin_rms = Input Cap RMS Current (A) 1.98 = IOUT*SQRT(D*(1-D)) ESROUT = Output Capacitor ESR (Ω) 35 EFFICIENCY CALCULATION Enter Values Calculation Results Formula RGH = GH Impedance (Ω)4 Pic = IC Power (switching) (mW) 31.35 = Icc*VIN+Chs*VIN*Fs*0.001 PMOS TRISE = SP6122 typ. PMOS rise time (ns) 20 Psch = Schottky Conducting Loss (mw) 848.48 = Vf*IOUT*(1-D)*1000 TFALL = SP6122 typ. PMOS rise time (ns) 40 Chs = PMOS Gate Charge @ VIN (nc) 15 Pch = PMOS Conducting Loss (mW) 202.67 = IOUT*IOUT*D*Rhs Rhs = RDS(ON) @ VIN (mΩ) 22 Psh = PMOS Switching Loss (mW) 118.80 = 1/2*IOUT*VIN*(TRISE+TFALL)*Fs*0.001 Phs = Total PMOS Loss (mW) 321.47 = Pch + Psh Vf = Schottky Forward Voltage 0.5 Pl = Inductor loss (mW) 192.00 = IOUT*IOUT*ESR_L ICC = Supply Current (no switch) (mA) 5 PcIN = Input Capacitor Loss(mW) 19.54 = ESRIN*Iin_rms*Iin_rms ESR_L = Inductor ESR (mΩ) 12 Pltot = Total Power Losses (mW) 1412.84 = Pic+Pls+Phs+Pl+Psch Efficiency (%) 84.32 = VOUT*IOUT/(VOUT*IOUT - Pltot/1000)*100 SP6122 Design Calculator Example: Evaluation Board with 3.3VIN, 1.9VOUT Table 2: Design Calculator Table 2, SP6122 Design Calculator, illus- trates the calculations and formulas con- tained in the Sipex Non-Synchronous Buck Cad Calculator spreadsheet, (available in the applications section of the Sipex website at www.sipex.com). The example shown is the same SP6122 Evaluation Board used previously with VIN = 3.3V, VOUT = 1.9V at 4A. As you can see, the SP6122 efficiency at 4A output is calculated to be 84.3%. Compare this with the Typical Performance Characteristics curve of 84.5%, which is very close considering the tolerances of various components, and you see how use- ful this easy design calculator is to evaluate your SP6122 designs. APPLICATION INFORMATION: Continued |
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