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R1190S012D-E2-FE Datasheet(PDF) 8 Page - RICOH electronics devices division |
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R1190S012D-E2-FE Datasheet(HTML) 8 Page - RICOH electronics devices division |
8 / 27 page R1190x 8 Inrush-Current Limit Function R1190x Series has the function to limit the inrush-current, it limited approximately 0.3A when the voltage regulator is turn ON. It is also possible to set time of the rush-current limitation by connecting capacitor with DELAY pin. The rush-current time (tD) and the value of capacitor (CD(F)) is calculatable by the following formula; tD =(0.000198+(3.79×107×CD))×VIN The inrush-current is limited even if the capacitor is not connected with the DELAY pin. In this case, the time is calculated as CD =0 by the formula above. Though, if the value of time is insufficient for controlling the inrush-current, please connect the capacitor with DELAY pin. The DELAY pin is used as OPEN when the capacitor is not used. Please use the DELAY pin as OPEN when the capacitor is not used. Auto-Discharge Function R1190xxxxD series has the auto-discharge function. When "L" signal is put into the Chip-enable pin (CE), the switch between VOUT and GND is turned ON and the charge at capacitor is discharge rapidly by the auto-discharge function. |
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