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R1155N025C-TR-FE Datasheet(PDF) 10 Page - RICOH electronics devices division |
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R1155N025C-TR-FE Datasheet(HTML) 10 Page - RICOH electronics devices division |
10 / 26 page R1155x NO.EA-270-150702 10 APPLICATION INFORMATION VOUT VOUT VIN VDD GND CE CIN COUT R1155xxxxB V IN V OUT VDD GND V FB CE CIN R115 5x00 1C COUT V OUT R1 R2 R1155xxxxB Typical Application (Fixed Output Voltage Type) R1155x001C Typical Application (Adjustable Output Voltage Type) Technical Notes on the Components Selection In the R1155x, phase compensation is provided to secure stable operation even when the load current is varied. For this purpose, use a 4.7 μF or more output capacitor (COUT) with good frequency characteristics and proper ESR (Equivalent Series Resistance). In case of using a tantalum type capacitor and the ESR value of the capacitor is large, the output might be unstable. Evaluate the circuit including consideration of frequency characteristics. Ensure the VDD and GND lines are sufficiently robust. If their impedance is too high, noise pickup or unstable operation may result. Connect COUT with suitable values between the VOUT and GND pins, and as close as possible to the pins. Please refer to Figure 5 and Figure 6 below. |
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