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S-19243H50H-E6T1U Datasheet(PDF) 25 Page - ABLIC Inc. |
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S-19243H50H-E6T1U Datasheet(HTML) 25 Page - ABLIC Inc. |
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25 / 74 page  AUTOMOTIVE, 105°C OPERATION, 10 V INPUT, 500 mA VOLTAGE REGULATOR WITH SOFT-START FUNCTION Rev.3.2_00 S-19243xxxH Series 25 Condition of Application Input capacitor (CIN): A ceramic capacitor with capacitance of 2.2 μF or more is recommended. Output capacitor (CL): A ceramic capacitor with capacitance of 2.2 μF or more is recommended. Caution Generally, in a voltage regulator, an oscillation may occur depending on the selection of the external parts. Perform thorough evaluation including the temperature characteristics with an actual application using the above capacitors to confirm no oscillation occurs. Selection of Input Capacitor (CIN) and Output Capacitor (CL) The S-19243xxxH Series requires CL between the VOUT pin and the VSS pin for phase compensation. The operation is stabilized by a ceramic capacitor with capacitance of 2.2 μF or more. When using an OS capacitor, a tantalum capacitor or an aluminum electrolytic capacitor, the capacitance also must be 2.2 μF or more. However, an oscillation may occur depending on the equivalent series resistance (ESR). Moreover, the S-19243xxxH Series requires CIN between the VIN pin and the VSS pin for a stable operation. Generally, an oscillaiton may occur when a voltage regulator is used under the conditon that the impedance of the power supply is high. Note that the output voltage transient characteristics varies depending on the capacitance of CIN and CL and the value of ESR. Caution Perform thorough evaluation including the temperature characteristics with an actual application to select CIN and CL. Selection of Capacitor for Soft-start (CSS) The S-19243xxxH Series E / F / G / H type requires the capacitor for soft-start (CSS) between the SSC pin and the VSS pin. Over the entire temperature range, the S-19243xxxH Series operates stably with a ceramic capacitor of 0.68 nF or more. According to CSS capacitance, the rising speed of the output voltage is adjustable. The time that the output voltage rises to 99% is 6.0 ms typ. at CSS = 10 nF. The recommended value for applications is 0.68 nF ≤ CSS ≤ 168 nF, however; define the values by sufficient evaluation including the temperature characteristics under the usage condition. Selection of Resistor for Output Voltage External Setting (Ra, Rb) The S-19243xxxH Series provides the types in which output voltage can be set via the external resistor. The output voltage can be set by connecting a resistor (Ra) between the VOUT pin and the VADJ pin, and a resistor (Rb) between the VADJ pin and the VSS pin. Depending on the intended output voltage, select Ra and Rb from the range shown in Table 27. Caution Since the VADJ pin impedance is comparatively high and is easily affected by noise, pay adequate attention to the wiring pattern. Table 27 VOUT Ra Rb 1.0 V Connect to VOUT pin Unnecessary 1.05 V to 9.0 V 0.1 k Ω to 1.2 MΩ 2 k Ω to 200 kΩ |
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