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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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FREQ датащи(PDF) 29 Page - fujitsu semiconductor |
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FREQ датащи(HTML) 29 Page - fujitsu semiconductor |
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29 / 56 page  29 MB39A214A Limitation : development tool vendor use only FUJITSU SEMICONDUCTOR CONFIDENTIAL DS405-00007-1v0-E Setting switching frequency The switching frequency is set at the FREQ pin. As for the setting process, see the switching frequency control function table. Setting over current limitation The over current limitation value can be set by adjusting the over current limitation setting resistor value connected to the ILIM pin. Calculate the resistor value by the following formula. ΔIL RLIM = 10 6 RON_Sync (ILIM − 2 ) RLIM : Over current limitation value setting resistor [Ω] ILIM : Over current limitation value [A] ΔIL : Ripple current peak-to-peak value of inductor [A] RON_Sync : ON resistance of low-side FET [Ω] ILIM RLIM IOUT ILIM 0 If the rate of inductor saturation current is small, the inductor value decreases and the ripple current of inductor increase when the over-current flows. At that time there is a possibility that the limited output current increases or is not limited, because the bottom of inductor current is detected. It is necessary to use the inductor that has enough large rate of inductor saturation current to prevent the overlap current. Inductor current Over current limitation value Time ΔIL |
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