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R1234D201A Datasheet(PDF) 8 Page - RICOH electronics devices division |
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R1234D201A Datasheet(HTML) 8 Page - RICOH electronics devices division |
8 / 26 page R1234D 8 • R1234DxxxD Topt =25°C Symbol Item Conditions Min. Typ. Max. Unit VIN Operating Input Voltage 2.7 5.5 V VFB Feedback Voltage VIN =VCE=VSET+1.5V, VMODE =0V, IOUT=10mA 0.776 0.800 0.824 V ∆VFB/∆Topt Feedback Voltage Temperature Coefficient −40°C < = Topt < = 85°C ±300 ppm/ °C fosc Oscillator Frequency VIN =VCE=VSET+1.5V 680 800 920 kHz IDD Supply Current VIN =VCE=VSET+1.5V, VFB =VMODE=0V 250 400 µA Istandby Standby Current VIN =5.5V, VCE=VFB=0V 0 5 µA RONP ON Resistance of Pch Transistor VIN =5.0V 0.2 0.4 0.9 Ω RONN ON Resistance of Nch Transistor VIN =5.0V 0.2 0.6 0.9 Ω ILXleak LX Leakage Current VIN =5.5V, VCE=0V, VLX =0V or 5.5V −5.0 0.0 5.0 µA IVFBleak VFB Leakage Current VIN =5.5V, VCE=0V, VFB =0V or 5.5V −0.1 0.0 0.1 µA ICE CE Input Current VIN =5.5V, VMODE=0V, VCE =5.5V or 0V −0.1 0.0 0.1 µA IMODE MODE Pin Input Current VIN =5.5V, VCE=0V, VMODE =5.5V or 0V −0.1 0.1 µA VCEH CE "H" Input Voltage VIN =5.5V, VFB=0V 1.5 V VCEL CE "L" Input Voltage VIN =2.4V, VFB=0V 0.3 V VMODEH MODE "H" Input Voltage VIN =VCE=5.5V, VFB=0V 1.5 V VMODEL MODE "L" Input Voltage VIN =VCE=2.4V, VFB=0V 0.3 V Maxduty Oscillator Maximum Duty Cycle VMODE =0V 100 % tstart LX Limit Voltage at no load, VIN =VCE=VSET+1.5V 0.5 1.5 2.5 ms VLXlim Delay Time by Soft-Start function VMODE =VFB=0V, VIN =VCE=3.0V VIN −0.15 VIN −0.35 VIN −0.65 V Tprot Delay Time for protection circuit VIN =VCE=3.6V, VMODE =0V 0.5 1.5 2.5 ms VUVLO1 UVLO Threshold Voltage VIN =VCE=2.5V→1.5V, VMODE =0V 1.95 2.20 2.45 V VUVLO2 UVLO Released Voltage VIN =VCE=1.5V→2.7V, VFB =0V 2.20 2.40 2.65 V VFMduty VFM Duty Cycle VIN =VCE=VMODE=2.4V, VFB =0V 55 65 85 % |
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