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APL560150VH-TRG Datasheet(PDF) 9 Page - Anpec Electronics Coropration |
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APL560150VH-TRG Datasheet(HTML) 9 Page - Anpec Electronics Coropration |
9 / 18 page Copyright © ANPEC Electronics Corp. Rev. A.7 - Jun., 2012 www.anpec.com.tw 9 APL5601/5602 Function Description A thermal shutdown circuit limits the junction tempera- ture of APL5601/5602. When the junction temperature exceeds +150oC, the thermal shutdown circuitry disables the output, allowing the device to cool down. The output circuitry is enabled again after the junction temperature cools down by 40oC, resulting in a pulsed output during continuous thermal overload conditions. Thermal pro- tection is designed to protect the IC in the event of over temperature conditions. For reliable operation, the junc- tion temperature cannot exceed T J=+125 oC. Under Voltage Lockout (UVLO) The APL5601/5602 regulators have built-in under-volt- age lock-out circuits to keep the output shuting off until internal circuitry is operating properly. The UVLO function initiates a soft-start process after input voltage exceeds its rising UVLO threshold during power on. Typical UVLO threshold is 2.5V with 0.15V hysteresis. Soft-Start The APL5601/5602 provide an internal soft-start circuitry to control rise rate of the output voltage and limit the cur- rent surge during start-up. Approximate 20 µs delay time after the V IN is over the UVLO threshold, the output voltage starts the soft-start. The typical soft-start interval is about 130 µs. Current-Limit The APL5601/5602 provides a current-limit circuitry, which monitors and controls P-MOS’s gate voltage, limiting the output current to 700mA. For reliable operation, the de- vice should not be operated in current-limit for extended period. Short Circuit Current-Limit When the output voltage drops below 0.6V, which is caused by the over load or short circuit, the internal short circuit current-limit circuitry limits the output current down to 250mA. The short circuit current-limit is used to reduce the power dissipation during short circuit condition. In some high V IN-VOUT conditions, if the junction tempera- ture is over the thermal shutdown temperature, the de- vice will enter the thermal shutdown. Please refer to the section on thermal considerations for power dissipation calculations. The short circuit current-limit has a blank- ing time feature after the UVLO threshold is reached, so that it will avoid the output causing short circuit current- limit protection during start-up; the blanking time is about 600 µs. Thermal Shutdown |
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