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R1173H151B-T1-FE Datasheet(PDF) 8 Page - RICOH electronics devices division |
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R1173H151B-T1-FE Datasheet(HTML) 8 Page - RICOH electronics devices division |
8 / 26 page R1173x 8 Technical Notes on External Components and Typical Application (Refer to the example of typical application) VOUT V R1173xxx Series VIN C1 VDD GND CE IOUT C2 VOUT ADJ Example of the typical application of R1173x (Fixed Output Type) Phase Compensation In these ICs, phase compensation is made with the output capacitor for securing stable operation even if the load current is varied. For this purpose, use as much as a capacitor as C2. Recommendation value is as follows: Mounting on PCB Make VDD and GND lines sufficient. If their impedance is high, a current flows, the noise picked up or unstable operation may result. Further use a 4.7 μF or more value capacitor between VDD pin and GND pin as close as possible. Set an Output capacitor between VOUT pin and GND pin for phase compensation as close as possible. Output Voltage C2 recommendation value Components Recommendation VOUT<1.0V Tantalum 4.7 μF or more 1.0 < = VOUT<3.3V Ceramic 4.7 μF or more Kyocera 4.7 μF (1608) Part Number: CM105X5R475M06AB Murata 4.7 μF (1608) Part Number: GRM188R60J475KE19B Murata 10 μF (1608) Part Number: GRM188B30G106ME46B 3.3V < = VOUT Ceramic 4.7 μF or more Kyocera 4.7 μF (thin 2012) Part Number: CT21X5R475M06AB Murata 10 μF (1608) Part Number: GRM188B30G106ME46B If you use a tantalum type capacitor and ESR value of the capacitor is large, output might be unstable. Evaluate your circuit with considering frequency characteristics. Depending on the capacitor size, manufacturer, and part number, the bias characteristics and temperature characteristics are different. Evaluate the circuit with actual using capacitors. |
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