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APE8805 Datasheet(PDF) 4 Page - Advanced Power Electronics Corp. |
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APE8805 Datasheet(HTML) 4 Page - Advanced Power Electronics Corp. |
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4 / 9 page  4/9 APE8805 Advanced Power Electronics Corp. Block Diagram Error Amp Current Limit Thermal Shutdown _ __ _ + + + + Vref 1.2V VIN VOUT GND RSEN PMOS R1 R2 Figure 3. Block Diagram of APE8805 Application Information The APE8805 series are low dropout linear regulators that could provide 600mA output current at dropout voltage about 600mV. Besides, current limit and on chip thermal shutdown features provide protection against any combination of overload or ambient temperature that could exceed junction temperature. 1.Output and Input Capacitor The APE8805 regulator is designed to be stable with a wide range of output capacitors. The ESR of the output capacitor affects stability. Larger value of the output capacitor decreases the peak deviations and provides to improve transition response for larger current changes. The capacitor types (aluminum, ceramic, and tant- alum) have different characterizations such as temperature and voltage coefficients. All ceramic capacitors are manufactured with a variety of dielectrics, each with different behavior across temperature and applications. Common dielectrics used are X5R, X7R and Y5V. It is recommended to use 1uF to 10uF X5R or X7R dielectric ceramic capacitors with 30m Ω Ω Ω Ω to 50m Ω Ω Ω Ω ESR range betw- een device outputs to ground for transient stability. The APE8805 is designed to be stable with low ESR ceramic capacitors and higher values of capacitors and ESR could improve output stability. So the ESR of output capacitor is very important beca- use it generates a zero to provide phase lead for loop stability. There are no requirements for the ESR on the input capacitor, but its voltage and temperature coefficient have to be considered for device application environment. 2.Protection Features In order to prevent overloading or thermal cond- ition from damaging device, APE8805 regulator has internal thermal and current limiting functions designed to protect the device. It will rapidly shut off PMOS pass element during overloading or over temperature condition. 3.Thermal Consideration The power handling capability of the device will be limited by maximum operation junction temp- erature (125 °°°°C). The power dissipated by the device will be estimated by PD = IOUT ×××× (VIN-VOUT). The power dissipation should be lower than the maximum power dissipation listed in “Absolute Maximum Ratings” section. |
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