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RP100K201D Datasheet(PDF) 5 Page - RICOH electronics devices division |
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RP100K201D Datasheet(HTML) 5 Page - RICOH electronics devices division |
5 / 28 page RP100x 5 TYPICAL APPLICATION C1 RP100x Series VDD VOUT CE GND C2 VOUT (External Components) C2 1.0 µF 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 good frequency characteristics and ESR (Equivalent Series Resistance). Ceramic capacitors have different temperature characteristics and bias characteristics depending on their dimensions and manufacturers. If the setting voltage is 2.5V or more and the capacitor’s dimensions for V OUT equal to 1.0mm by 0.5mm or smaller than that, the capacitance value might be extremely low. As a result, the capacitance might be much less than expected value. In such cases, the operation might be unstable at low temperature. (-20 °C or less) In that case, use a larger capacity, or a large dimensions’ capacitor. (For example 1.6mm by 0.8mm) If a tantalum capacitor is selected as an output capacitor, large ESR may be a cause of unstable operation. Evaluate the operation of PCB with considerable 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 1.0 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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