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RP201K251B-TR Datasheet(PDF) 9 Page - RICOH electronics devices division |
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RP201K251B-TR Datasheet(HTML) 9 Page - RICOH electronics devices division |
9 / 26 page RP201x 9 TYPICAL APPLICATION C1 RP201x Series VDD VOUT CE GND VOUT AE C2 (External Components) C1, C2 : Ceramic Capacitor 1.0 F MURATA: GRM155B31A105KE15 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 C2 with 1.0 F or more and good ESR (Equivalent Series Resistance). (Note: If additional ceramic capacitors are connected with parallel 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 C1 with a capacitance value as much as 1.0 F or more between VDD and GND pin, and as close as possible to the pins. Set external components, especially the output capacitor C2, as close as possible to the ICs, and make wiring as short as possible. Impedance of Input Pin (CE Pin and AE Pin) In those ICs, there is a pull-down constant current in the CE Pin and the AE Pin. However, if those pins are floating and wired long that produce the noise environment, it might miss-operation of ICs. For this purpose, please make sure enough evaluation of ICs. *RP201Q (SC-88A) and RP201N (SOT-23-5) are the discontinued products. As of June in 2016. |
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