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RP130Q121A5 Datasheet(PDF) 9 Page - RICOH electronics devices division |
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RP130Q121A5 Datasheet(HTML) 9 Page - RICOH electronics devices division |
9 / 32 page RP130x NO.EA-173-131031 9 TYPICAL APPLICATION C1 RP130x Series VDD VOUT CE GND C2 VOUT (External Components) Ceramic Capacitor C2 0.47 μF MURATA GRM155B30J474KE18B 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 0.47 μF or more. If a tantalum capacitor is used, and its ESR (Equivalent Series Resistance) of C2 is large, the loop oscillation may result. Because of this, select C2 carefully considering its frequency characteristics. 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 0.47 μF 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. |
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