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APL5324 Datasheet(PDF) 9 Page - Anpec Electronics Coropration |
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APL5324 Datasheet(HTML) 9 Page - Anpec Electronics Coropration |
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9 / 16 page  Copyright © ANPEC Electronics Corp. Rev. A.1 - Jan., 2013 APL5324 www.anpec.com.tw 9 Function Description + ⋅ = R2 R1 1 0.8 VOUT Where R1 is connected from VOUT to SET with Kelvin sensing and R2 is connected from SET to GND. The rec- ommended value of R2 is in the range of 100 to100k Ω. An error amplifier works with a temperature compensated 0.8V reference and an output PMOS regulates the output to the presetting voltage. The error amplifier is designed with high bandwidth and DC gain provides very fast tran- sient response and less load regulation. It compares the reference with the feedback voltage and amplifies the dif- ference to drive the output PMOS which provides load current from VIN to VOUT. Output Voltage Regulation The APL5324 is an adjustable low dropout linear regulator. The output voltage set by the resistor-divider is determined by: Thermal Shutdown A thermal shutdown circuit limits the junction tempera- ture of APL5324. When the junction temperature exceeds +160οC, 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 is cooled down by 40oC. The thermal shutdown is designed with a 40oC hyster- esis to lower the average junction temperature during continuous thermal overload conditions, extending life- time of the device. For normal operation, device power dissipation should be externally limited so that junction temperature will not exceed 125oC. Shutdown Control The APL5324 has an active-low shutdown function. Force SHDN high (>1.6V) enables the V OUT; force SHDN low (<0.4V) disables the V OUT. SHDN is internally pulled low by a resistor (3m Ω typical). If it is not used, connect to VIN for normal operation. |
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