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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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SC5014AEVB датащи(PDF) 19 Page - Semtech Corporation |
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SC5014AEVB датащи(HTML) 19 Page - Semtech Corporation |
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19 / 27 page  SC5014A 9 Components Selection (continued) Current Sensing Resistor Selection The switch current is sensed via the current sensing resis- tor, R CS. The sensed voltage at this pin is used to set the peak switch current limit and also used for steady state regulation of the inductor current. The current limit com- parator has a trip voltage of 0.4V (typical). R CS value is chosen to set the peak inductor and switch current using the following equation. I2 SW(Peak)=0.4/RCS The power dissipation in R CS can be calculated using the following equations. P R_CS=IRMS 2 xR CS I RMS=Dx[IO/(1-D)] 2 I O=OutputDCCurrent,D=DutyCycle For the typical application circuit shown in the detailed application circuit (page 20, Figure 2), the power dissipa- tion on the sensing resistor is shown by the following equations. Assuming V IN = 6V and VOUT = 3.5V, thus D = 8%, P R_CS=0.81X(0.48/0.19) 2 X0.08=0.414(W) For this example, a 0.08 Ω % thick-film chip resistor rated at W can be used. |
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