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RP107Z201D-TR-F Datasheet(PDF) 7 Page - RICOH electronics devices division |
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RP107Z201D-TR-F Datasheet(HTML) 7 Page - RICOH electronics devices division |
7 / 40 page RP107x NO.EA-181-131018 7 TYPICAL APPLICATION CIN RP107x Series VDD VOUT CE GND COUT ∗ VOUT TECHNICAL NOTES When using the RP107x Series, please note the following points. *Phase Compensation The RP107x Series are using an output capacitor as phase compensation to ensure a stable operation even if the output load fluctuates. To reduce the output voltage fluctuation, it is imperative that a 0.1µF to 10µF output capacitor be used. When doing so, please note the following three points. 1. If the output capacitor is 2.2µF or more and the output current is 0.01mA or less*1, the noise level may increase beyond 40µV, therefore, it is imperative that the stability of operation including the frequency characteristics be evaluated. 2. If the output capacitor is 0.01µF or less and the output current is 0.1mA or less*2, the exogenous noise occurred in the other circuits may give some impacts on the noise level, therefore it is imperative that the enough measures be taken such as to make GND lowered. As for 1 and 2, please refer to the chart of the External Capacitor vs. Output Voltage. 0 0.0001 0.001 0.01 0.1 1 10 0 0.001 0.01 0.1 1 10 100 1000 I OUT [mA] ノイズレベル>40 μV 外来ノイズの影響を受け易い ノイズレベル≦40 μV ※1 ※2 IOUT [mA] Noise Level ≤ 40µV Noise Level > 40µV This area could be easily affected by exogenous noise. *1 *2 External Capacitor vs. Output Voltage 3. In case of using a tantalum capacitor, the output may oscillate if the effective series resistance (ESR) is high, therefore, it is imperative that the ESR vs. Frequency be considered. PCB Layout If the impedances of VDD and GND lines are high, the ICs may pick up noise or may cause unstable operation when the current flows. Therefore, make VDD and GND the lowest possible. Also, place a 0.1µF or more CIN capacitor between VDD pin and GND pin as close as possible to each other. *RP107N (SOT-23-5) is the non-promotion product. As of June in 2016. |
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