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R1230D001D Datasheet(PDF) 8 Page - RICOH electronics devices division |
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R1230D001D Datasheet(HTML) 8 Page - RICOH electronics devices division |
8 / 20 page Rev. 1.12 - 8 - s s s s TYPICAL APPLICATION AND TECHNICAL NOTES 1) Fixed Output Voltage Type CIN COUT AGND MODE VOUT CE VDD PGND Lx VIN LOAD L VOUT L : 10 µH LQH3C100K54(Murata) COUT : 10 µF ECSTOJX106R(Panasonic) CIN : 10 µF C3216JB0J106M(TDK) 2) Adjustable Output Voltage Type Rb Cb CIN COUT AGND MODE VFB CE VDD PGND LX VIN LOAD R1 R2 L VOUT L: 10 µH LQH3C100K54 (Murata) COUT:10 µF ECSTOJX106R (Panasonic) CIN:10 µF C3216JB0J106M (TDK) Standard value of the sum of Divider Resistors, R1+R2 is as much as 100k Ω. Cb value for phase compensation depends on values of L, C, and R1. Refer to the technical notes. If a ceramic capacitor is used as an output capacitor, add 0.2 Ω or more resistance to compensate the ESR of the capacitor. When you use these ICs, consider the following issues; q Input same voltage into Power Supply pins, VIN and VDD. Set the same level as AGND and PGND. q When you control the CE pin and MODE pin by another power supply, do not make its "H" level more than the voltage level of VIN / VDD pin. q Set external components such as an inductor, CIN, COUT as close as possible to the IC, in particular, minimize the wiring to VIN pin and PGND pin. q At stand by mode, (CE=”L”), the Lx output is Hi-Z, or both P-channel transistor and N-channel transistor of Lx pin turn off. q Use an external capacitor COUT with a capacity of 10 µF or more, and with good high frequency characteristics such as tantalum capacitors. q At VFM mode, (MODE=”H”), Latch protection circuit does not operate. |
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