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APL5315-33 Datasheet(PDF) 9 Page - Anpec Electronics Coropration |
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APL5315-33 Datasheet(HTML) 9 Page - Anpec Electronics Coropration |
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9 / 16 page  Copyright © ANPEC Electronics Corp. Rev. A.2 - Mar., 2007 APL5315 www.anpec.com.tw 9 Typical Application Circuits (Cont.) 2. Adjustable Output Voltage Mode Functional Descriptions 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 80 µs. Under-Voltage Lock Out (UVLO) The APL5315 monitors the input voltage to prevent wrong logic control. The UVLO function initiates a soft- start process after input voltage exceeds its rising UVLO threshold during power on. The UVLO function also shuts off the output when the input voltage falls below it’s falling threshold. Typical UVLO hysteresis voltage is 0.8V. + ⋅ = R2 R1 1 0.8 V OUT Where R1 is connected from VOUT to SET with Kelvin sensing and R2 is connected from SET to GND. The recommended value of R2 is in the range of 100~100K Ω. An error amplifier working with a temperature compen- sated 0.8V reference and an output PMOS regulates the output to the presetting voltage. The error amplifier designed with high bandwidth and DC gain provides very fast transient response and less load regulation. It compares the reference with the feedback voltage and amplifies the difference to drive the output PMOS which provides load current from VIN to VOUT. + ⋅ = R2 R1 1 0.8 V OUT Thermal Shutdown A thermal shutdown circuit limits the junction tempera- ture of APL5315. When the junction temperature exceeds +160οC, a thermal sensor turns off the output PMOS, allowing the device to cool down. The regulator regu- lates the output again through initiation of a new soft- start cycle after the junction temperature cools by 40οC. The thermal shutdown designed with a 40οC hysteresis lowers the average junction temperature during continu- ous 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 125οC. Output Voltage Regulation The APL5315 can works in either fixed or adjustable mode by connecting the SET to GND or a resistor-divider which receives the feedback voltage of the regulator. The output voltage set by the resistor-divider is determined by: Shutdown Control The APL5315 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. VIN SHDN GND VOUT SET C IN 1 2 3 4 5 APL5315 V OUT C OUT V IN 2.2 µF 1 µF Enable Shutdown R 1 R 2 |
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