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R1124N271B Datasheet(PDF) 6 Page - RICOH electronics devices division |
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R1124N271B Datasheet(HTML) 6 Page - RICOH electronics devices division |
6 / 23 page R1124N 6 • ELECTRICAL CHARACTERISTICS by OUTPUT VOLTAGE Topt = 25°C Dropout Voltage VDIF (V) Output Voltage VOUT (V) Condition Typ. Max. VOUT = 1.5 0.38 0.70 VOUT = 1.6 0.36 0.65 VOUT = 1.7 0.34 0.60 1.8 < = VOUT < = 2.0 0.32 0.55 2.1 < = VOUT < = 2.7 0.28 0.50 2.8 < = VOUT < = 4.0 IOUT = 150mA 0.22 0.35 TECHNICAL NOTES When using these ICs, consider the following points: Phase Compensation In these ICs, phase compensation is made for securing stable operation even if the load current is varied. For this purpose, use a capacitor COUT with good frequency characteristics and ESR (Equivalent Series Resistance). (Note: When the additional ceramic capacitors are connected to the output pin with an output capacitor for phase compensation, the operation might be unstable. Because of this, test these ICs with as same external components as ones to be used on the PCB.) PCB Layout Make VDD and GND lines sufficient. If their impedance is high, noise pickup or unstable operation may result. Connect a capacitor with a capacitance value as much as 1.0µF or more between VDD and GND pin, and as close as possible to the pins. Set external components, especially the output capacitor, as close as possible to the ICs, and make wiring as short as possible |
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