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S-19244XXXH Datasheet(PDF) 31 Page - ABLIC Inc. |
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S-19244XXXH Datasheet(HTML) 31 Page - ABLIC Inc. |
31 / 68 page AUTOMOTIVE, 105°C OPERATION, 10 V INPUT, 1000 mA VOLTAGE REGULATOR WITH SOFT-START FUNCTION Rev.3.2_00 S-19244xxxH Series 31 8. 1 S-19244xxxH Series A / B / C / D type By charging the built-in capacitor via the built-in constant current source, tSS = 1.0 ms typ. is generated. 8. 2 S-19244xxxH Series E / F / G / H type tSS can be adjusted by the external capacitor (CSS) connected between the SSC pin and the VSS pin, and is calculated by using the following calculation. tSS [ms] = Soft-start coefficient *1 [ms / nF] × CSS [nF] + tD0*2 [ms] *1. It is determined by charging the built-in constant current (approx. 2.1 μA) to CSS. *2. The delay time of internal capacitance. When the CSS value is sufficiently large, the tD0 value can be disregarded. When the ON / OFF pin is set to OFF, the electrical charge charged in CSS is discharged by the transistor of the discharge shunt circuit. Table 28 Soft-start Coefficient [ms / nF] Operation Temperature Min. Typ. Max. Tj = +150°C 0.391 0.528 0.691 Tj = +105°C 0.398 0.539 0.690 Tj = +25°C 0.436 0.574 0.704 Tj = −40°C 0.467 0.604 0.717 Table 29 Delay Time of Internal Capacitnace (tD0) Operation Temperature Min. Typ. Max. Tj = −40°C to +150°C 0.032 ms 0.047 ms 0.108 ms Caution The above calculation will not guarantee successful operation. Perform thorough evaluation using the actual application including the temperature characteristics under the actual usage conditions to determine CSS capacitance. Refer to " Condition of Application" and " Characteristics (Typical Data)" for details. |
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