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RP154N030A-TR-FE Datasheet(PDF) 9 Page - RICOH electronics devices division |
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RP154N030A-TR-FE Datasheet(HTML) 9 Page - RICOH electronics devices division |
9 / 33 page RP154x NO. EA-202-141010 9 RP154LxxxA/B VOUT2 VOUT1 VIN1 VOUT2 VOUT1 GND CE1 CE2 VDD2 RP154L Series COUT2 COUT1 CIN1 VDD1 VIN2 CIN2 CIN1 CIN2COUT1COUT2Ceramic 1.0μF (External Components) COUT1, COUT2 Ceramic 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 capacitors (1.0 F or more) for COUT1 and COUT2 with good frequency characteristics and 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. If the tantalum capacitor is used and its ESR (equivalent series resistance) is too large, the output may be unstable, therefore, fully evaluation is necessary. PCB Layout Make VDD and GND lines sufficient. If their impedance is high, noise pickup or unstable operation may result. Connect capacitors 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 (CIN1/CIN2). Set external components, especially the output capacitors, as close as possible to the ICs, and make wiring as short as possible (COUT1/COUT2). |
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