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APL5323BI-TRG Datasheet(PDF) 8 Page - Anpec Electronics Coropration |
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APL5323BI-TRG Datasheet(HTML) 8 Page - Anpec Electronics Coropration |
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8 / 15 page  Copyright © ANPEC Electronics Corp. Rev. A.2 - Jul., 2010 APL5323 www.anpec.com.tw 8 Function Description 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 Ω to100kΩ. An error amplifier works with a temperature compensated 1.25V reference and an output PMOS regulates the out- put to the presetting voltage. The error amplifier is de- signed with high bandwidth and DC gain provides very fast transient response and less load regulation. It com- pares the reference with the feedback voltage and ampli- fies the difference to drive the output PMOS which pro- vides load current from VIN to VOUT. Output Voltage Regulation The APL5323 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 APL5323. 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 APL5323 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. + ⋅ = R2 R1 1 1.25 VOUT |
Similar Part No. - APL5323BI-TRG |
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Similar Description - APL5323BI-TRG |
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