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APL560325BI-TRG Datasheet(PDF) 9 Page - Anpec Electronics Coropration |
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APL560325BI-TRG Datasheet(HTML) 9 Page - Anpec Electronics Coropration |
9 / 19 page Copyright © ANPEC Electronics Corp. Rev. A.6 - Mar., 2011 www.anpec.com.tw 9 APL5603 Function Description Thermal Shutdown A thermal shutdown circuit limits the junction tempera- ture of APL5603. When the junction temperature exceeds +150oC, the thermal shutdown circuitry disables the output, which allows 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. Enable and Shutdown Driving the EN high turns on the regulator, driving the EN low puts the regulator into shutdown mode. A logic low also causes the output voltage to discharge to the GND. The EN is pulled low by an internal resistor. Under-Voltage Lockout (UVLO) The APL5603 regulator has a built-in under-voltage lock- out circuit to keep the output shut 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 2.4V with 0.15V hysteresis. Soft-Start The APL5603 provides an internal soft-start circuitry to control rise rate of the output voltage and limit the current 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 APL5603 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 due to 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 dis- sipation during short-circuit condition. In some high V IN- V OUT conditions, if the junction temperature is over the thermal shutdown temperature, the device will enter the thermal shutdown. Please refer to the section on thermal considerations for power dissipation calculations. The short-circuit current-limit has featured with blanking time 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. |
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