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S-19200A Datasheet(PDF) 14 Page - ABLIC Inc. |
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S-19200A Datasheet(HTML) 14 Page - ABLIC Inc. |
14 / 37 page AUTOMOTIVE, 105°C OPERATION, 50 V INPUT, 200 mA VOLTAGE REGULATOR S-19200A/BxxH Series Rev.2.2_00 14 5. Thermal shutdown circuit The S-19200A/BxxH Series has a thermal shutdown circuit to protect the device from damage due to overheat. When the junction temperature rises to 150 °C typ., the thermal shutdown circuit operates to stop regulating. When the junction temperature drops to 125 °C typ., the thermal shutdown circuit is released to restart regulating. Due to self-heating of the S-19200A/BxxH Series, if the thermal shutdown circuit starts operating, it stops regulating so that the output voltage drops. When regulation stops, the S-19200A/BxxH Series does not itself generate heat and the IC's temperature drops. When the temperature drops, the thermal shutdown circuit is released to restart regulating, thus this IC generates heat again. Repeating this procedure makes the waveform of the output voltage into a pulse-like form. Stop or restart of regulation continues unless decreasing either or both of the input voltage and the output current in order to reduce the internal power consumption, or decreasing the ambient temperature. Table 10 Thermal Shutdown Circuit VOUT Pin Voltage Operate: 150 °C typ. *1 VSS level Release: 125 °C typ. *1 Set value *1. Junction temperature |
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