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Datenblatt-Suchmaschine für elektronische Bauteile |
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Datenblatt-Suchmaschine für elektronische Bauteile |
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AN4501 Datenblatt(PDF) 13 Page - STMicroelectronics |
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AN4501 Datenblatt(HTML) 13 Page - STMicroelectronics |
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13 / 48 page  DocID026394 Rev 1 13/48 AN4501 Guideline for the selection of external components 47 Table 2. Results of the iterative calculation of the worst case junction temperature Iteration TJ1 [°C] RON,M1@TJ1 [m Ω] PM1,COND@TJ1 [W] PM1@TJ1 [W] TJ2 [°C] RON,M1@TJ1 [m Ω] DiffRon [m Ω] 1 85 21.8 0.403 1.53 123 25.4 3.67 2 123 25.4 0.471 1.60 125 25.6 0.16 Table 3. Formula for currents and voltages of power components Parameter Value Worst case VIN (corresponding to the max parameter value) Comment D VIN,MIN Duty cycle η represents the efficiency of the boost converter IL VIN,MIN Inductor average current IL,PP VIN,50 Inductor peak-to-peak current ripple IL,PEAK VIN,MIN (in general) Inductor peak current. The worst case VIN must be verified case by case IL,RMS VIN,MIN (in general) The worst case VIN must be verified case by case as the second term is not a monotonic increasing function ID — Diode average current ID,PEAK VIN,MIN (in general) Diode peak current. The worst case VIN must be verified case by case VOUT,PP VIN,MIN Output peak-to-peak voltage ripple ESRCOUT is neglected IOUT,PP VIN,MIN Boost output and LED peak-to-peak current ripple VCIN,PP VIN,50 Input peak-to-peak current ripple ESRCIN is neglected IM1,RMS VIN,MIN (in general) MOSFET RMS current 1 V IN η × V OUT ------------------- – I L I OUT 1D – ------------- = V OUT D × 1D – () × LF SW ×η × --------------------------------------------------- I OUT 1D – ------------- V OUT D × 1D – () × 2L × F SW ×η × --------------------------------------------------- + I OUT 2 1D – () 2 --------------------- I LPP , 2 12 ----------------- + I OUT I OUT 1D – ------------- V OUT D × 1D – () × 2L × F SW ×η × --------------------------------------------------- + I OUT D × C OUT F SW × ---------------------------------- I OUT D × Nb LED R DLED × C × OUT F SW × ------------------------------------------------------------------------------------ I LPP , 8F × SW C IN × -------------------------------------- I M1,RMS I OUT 1D – ------------- D1 1 12 ------ I LPP , I L -------------- 2 + × = |
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