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NJM2819A Datasheet(PDF) 6 Page - New Japan Radio |
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NJM2819A Datasheet(HTML) 6 Page - New Japan Radio |
6 / 11 page NJM2819A - 6 - Ver.2010-02-08 Input Capacitance CIN Input Capacitance CIN is required to prevent oscillation and reduce power supply ripple for applications with high power supply impedance or a long power supply line. Use the CIN value of 4.7µF greater to avoid the problem. CIN should connect between GND and VIN as short as possible. Output Capacitance CO Output capacitor (Co) is required for a phase compensation of the internal error amplifier. The capacitance and the equivalent series resistance (ESR) influence stability of the regulator. If use a smaller Co, it may cause excess output noise or oscillation of the regulator due to lack of the phase compensation. Therefore, use Co with the recommended capacitance or greater value and connect between Vo terminal and GND terminal with minimal wiring. The recommended capacitance depends on the output voltage. Low voltage regulator requires greater value of the Co. Thus, check the recommended capacitance for each output voltage. Use of a greater Co reduces output noise and ripple output, and also improves transient response of the output voltage against rapid load change. This product is designed to work with any capacitor including a low ESR capacitor for the Co; however, refer "Equivalent Series Resistance vs. Output Current" and choose suitable capacitor. When distance from an IC to load is long, an IC may cause malfunction by wiring capacity and an L ingredient Please use it after having evaluated it enough. |
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