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APL5320-26A Datasheet(PDF) 11 Page - Anpec Electronics Coropration |
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APL5320-26A Datasheet(HTML) 11 Page - Anpec Electronics Coropration |
11 / 25 page Copyright © ANPEC Electronics Corp. Rev. A.9 - Mar., 2012 APL5320 www.anpec.com.tw 11 Function Description Internal Soft-Start An internal soft-start function controls rising rate of the output voltage to limit the surge current at start-up. The typical soft-start interval is about 60 µs. Thermal Shutdown A thermal shutdown circuit limits the junction tempera- ture of APL5320. When the junction temperature exceeds +160oC, a thermal sensor turns off the output PMOS, al- lowing the device to cool down. The regulator regulates the output again through initiation of a new soft-start cycle after the junction temperature cools by 40oC.The thermal shutdown is designed with a 40oC hysteresis to lower the average junction temperature during continuous ther- mal overload conditions, extending lifetime of the device. For normal operation, device power dissipation should be externally limited so that junction temperature will not exceed 125oC. Current-Limit with Current Foldback The APL5320 monitors the current via the output PMOS and limits the maximum current. When the output current reaches the current-limit threshold, current-limit with cur- rent foldback circuit starts to work to prevent load and APL5320 from damages during overload or short-circuit conditions. Typical foldback current is about 50mA. Shutdown Control The APL5320 has an active-low shutdown function. Forc- ing SHDN high (>1.5V) enables the V OUT; forcing SHDN low (<0.4V) disables the V OUT. The SHDN can not be left floating. If it is not used, connect it to VIN for normal operation. Under-Voltage Lock Out (UVLO) The APL5320 monitors the input voltage to prevent wrong logic control. The UVLO function initiates a soft-start pro- cess after input voltage exceeds its rising UVLO thresh- old during power on. The UVLO function also shuts off the output when the input voltage falls below it’s falling threshold. |
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