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APL5316-33BI-TRG Datasheet(PDF) 9 Page - Anpec Electronics Coropration |
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APL5316-33BI-TRG Datasheet(HTML) 9 Page - Anpec Electronics Coropration |
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9 / 16 page  Copyright © ANPEC Electronics Corp. Rev. A.3 - Jun, 2011 APL5316 www.anpec.com.tw 9 Typical Application Circuit (Cont.) 2. Function Description 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. A thermal shutdown circuit limits the junction tempera- ture of the APL5316. When the junction temperature ex- ceeds +160οC, a thermal sensor turns off the output PMOS, allowing 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 40οC. The thermal shutdown is designed with a 40οC hyster- esis to lower the average junction temperature during continuous thermal overload conditions, extending life time of the device. Power-ok (POK) VIN GND VOUT POK C IN 3 2 1 5 4 APL5316 V OUT C OUT V IN POK R 1 2.2μF 1KΩ 1μF SHDN The APL5316 indicates the status of the output voltage. As the V OUT rises and reaches the Power-ok threshold (V POK), the IC turns off the internal NMOS of the POK to indicate the output is ok. As the V OUT falls and reaches the falling Power-ok threshold (V PNOK), the IC immediately turns on the NMOS of the POK to indicate the output is not ok. The resistance of the resistor R1 connected from V OUT to POK or V IN to POK should be in the range from 1K to 50K. Internal Soft-Start Thermal Shutdown For normal operation, the device power dissipation should be externally limited by the design to keep the junction temperature below 125οC. Shutdown Control The APL5316 has an active-low shutdown function. Forc- ing SHDN high (>1.6V) enables the V OUT; forcing SHDN low (<0.4V) disables the V OUT. SHDN is internally pulled low by a resistor (3M Ω typical). If shutdown control is not necessary, please connect SHDN pin to VIN for normal operation. |
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