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S-T111B45MC-OHETFG Datasheet(PDF) 8 Page - Seiko Instruments Inc |
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S-T111B45MC-OHETFG Datasheet(HTML) 8 Page - Seiko Instruments Inc |
8 / 23 page HIGH RIPPLE-REJECTION LOW DROPOUT CMOS VOLTAGE REGULATOR S-T111 Series Rev.2.1_00 Seiko Instruments Inc. 8 Standard Circuit ON/OFF VSS VOUT VIN CIN *1 CL *2 Input Output GND Single GND *1. CIN is a capacitor for stabilizing the input. *2. A ceramic capacitor of 0.1 μF or more can be used for C L. Figure 9 Caution The above connection diagram and constant will not guarantee successful operation. Perform thorough evaluation using the actual application to set the constant. Application Conditions Input capacitor (CIN): 0.1 μF or more Output capacitor (CL): 0.1 μF or more ESR of output capacitor: 10 Ω or less Caution A general series regulator may oscillate, depending on the external components selected. Check that no oscillation occurs with the application using the above capacitor. Selection of Input and Output Capacitors (CIN, CL) The S-T111 Series requires an output capacitor between the VOUT and VSS pins for phase compensation. Operation is stabilized by a ceramic capacitor with an output capacitance of 0.1 μF or more in the entire temperature range. However, when using an OS capacitor, tantalum capacitor, or aluminum electrolytic capacitor, a ceramic capacitor with a capacitance of 0.1 μF or more and an ESR of 10 Ω or less is required. The value of the output overshoot or undershoot transient response varies depending on the value of the output capacitor. The required capacitance of the input capacitor differs depending on the application. The recommended value for an application is 1.0 μF or more for C IN and 0.47 μF or more for CL; however, when selecting the output capacitor, perform sufficient evaluation, including evaluation of temperature characteristics, on the actual device. |
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