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RH5RH501A Datasheet(PDF) 7 Page - RICOH electronics devices division |
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RH5RH501A Datasheet(HTML) 7 Page - RICOH electronics devices division |
7 / 29 page 6 RH5RH • RH5RH501A VOUT=5.0V Unless otherwise provided, VIN=3V, Vss=0V, IOUT=10mA, Topt=25˚C, and use External Circuit of Typical Application (FIG. 1). (Note 1) Soft-Start Circuit is operated in the following sequence : (1) VIN is applied. (2) The voltage (Vref) of the reference voltage unit is maintained at 0V for about 200µs after the application of VIN. (3) The output of Error Amp. is raised to “H” level during the maintenance of the voltage (Vref) of the reference voltage unit. (4) After the rise of Vref, the output of Internal Error Amp. is gradually decreased to an appropriate value by the function of Internal Phase Compensation Circuit, and the Output Voltage is gradually increased in accordance with the gradual decrease of the output of Internal Error Amp. (Note 2) ILX is gradually increased 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 an Lx Switch Protection Circuit. Symbol Item VOUT Output Voltage VIN Input Voltage Vstart Start-up Voltage Vhold Hold-on Voltage IDD1 Supply Current 1 IDD2 Supply Current 2 ILX Lx Switching Current ILXleak Lx Leakage Current fosc Oscillator Frequency Maxdty Oscillator Maximum Duty Cycle η Efficiency tstart Soft-Start Time 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 OUT Pin (excluding Switching Current) 30 45 µA To be measured at OUT Pin (excluding Switching Current) 2 5 µA VIN=5.5V VLX=0.4V 80 mA VLX=6V,VIN=5.5V 0.5 µA 40 50 60 kHz on (VLX “L” ) side 70 80 90 % 70 85 % Time required for the rising 0.5 2.0 ms Note1 of VOUT up to 5V. Lx Switch ON 0.65 0.8 1.0 V Note2 |
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