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S-816A55AMC-BBET2G Datasheet(PDF) 9 Page - Seiko Instruments Inc |
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S-816A55AMC-BBET2G Datasheet(HTML) 9 Page - Seiko Instruments Inc |
9 / 24 page EXTERNAL TRANSISTOR TYPE CMOS VOLTAGE REGULATOR Rev.5.1_00 S-816 Series Seiko Instruments Inc. 9 2.2. Overcurrent Protection Circuit The overcurrent protection function of the S-816 Series monitors the EXT pin sink current (base current of the external PNP transistor) with an overcurrent protection circuit incorporated in the IC, and limits that current (EXT pin sink current). As the load current increases, the EXT pin sink current (base current of the external PNP transistor) also grows larger to maintain the output voltage. The overcurrent protection circuit clamps and limits the EXT pin sink current to the EXT output sink overcurrent set value (IMAX) in order to prevent it from increasing beyond that value. The load current at which the overcurrent protection function works is represented by the following equation: IOUT_MAX = IMAX × hFE In this case, hFE is the DC amplification factor of the external PNP transistor. IOUT_MAX represents the maximum output current of this regulator. If it is attempted to obtain a higher load current, the output voltage will fall. Note that within the overcurrent protection function of this IC, the external PNP transistor may not be able to be protected from collector overcurrents produced by an EXT-GND short-circuiting or other phenomenon occurring outside the IC. To protect the external PNP transistor from such collector overcurrents, it will be necessary to choose a transistor with a larger power dissipation than IOUT_MAX × VIN, or to add an external overcurrent protection circuit. With regard to this external overcurrent protection circuit, refer to "Overcurrent Protection Circuit" in " Application Circuits". 2.3. Phase Compensation Circuit The S-816 Series performs phase compensation with a phase compensation circuit, incorporated in the IC, and the ESR (Equivalent Series Resistance) of an output capacitor, to secure stable operation even in the presence of output load variation. A uniquely devised phase compensation circuit has resulted in improved transient response characteristics of the IC, while preserving the same feature of low current consumption. This feature allows the IC to be used in applications where the input variation or load variation is heavy. Because the S-816 Series is designed to perform the phase compensation, utilizing the ESR of an output capacitor, such output capacitor (CL) should always be placed between VOUT and VSS. Since each capacitor to be employed has an optimum range of their own characteristics, be sure to choose components for the IC with your all attention. For details, refer to " Selection of Associated External Components". |
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