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RH5RI351A Datasheet(PDF) 7 Page - RICOH electronics devices division |
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RH5RI351A Datasheet(HTML) 7 Page - RICOH electronics devices division |
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7 / 24 page  6 RH5RI • RH5RI501B Unless otherwise provided, VIN=3V, Vss=0V, IOUT=10mA, Topt=25˚C, and use External Circuit of Typical Application (FIG. 1). Symbol Item VOUT Output Voltage VIN Input Voltage Vstart Start-up Voltage Vhold Hold-on Voltage IIN1 Input Current 1 IIN2 Input Current 2 ILX Lx Switching Current ILXleak Lx Leakage Current fosc Maximum Oscillator Frequency Maxdty Oscillator Duty Cycle η Efficiency VLXlim VLX Voltage Limit Conditions MIN. TYP. MAX. Unit Note 4.875 5.000 5.125 V 8V IOUT=1mA,VIN:0 →2V 0.8 0.9 V IOUT=1mA,VIN:2 →0V 0.7 V To be measured at VIN at no load 612 µA To be measured at VIN 25 µA VIN=5.5V VLX=0.4V 80 mA VLX=6V,VIN=5.5V 0.5 µA 80 100 120 kHz on (VLX “L” ) side 65 75 85 % 70 80 % Lx Switch On 0.65 0.8 1.0 V Note2 VOUT=5.0V (Note) ILX is gradually increased by the external inductor after Lx Switch is turned ON. In accordance with the increase of ILX, VLX is also increased. When VLX reaches VLXlim, Lx Switch is turned OFF by Lx Switch Protection Circuit. The time period from the time at which VLX reaches VLXlim to the time at which Lx Switch is turned OFF is about 3µs. |
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