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APE2902Y5R-48 Datasheet(PDF) 4 Page - Advanced Power Electronics Corp. |
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APE2902Y5R-48 Datasheet(HTML) 4 Page - Advanced Power Electronics Corp. |
4 / 8 page Advanced Power Electronics Corp. APE2902 APPLICATION INFORMATION Input/Output Capacitor Selection Inductor Selection Diode Selection PCB layout guide 4 The Output Ripple Voltage, as well as the Efficiency, is strictly related to the behavior of these elements. The output ripple voltage is the product of the peak inductor current and the output capacitor Equivalent Series Resistance (ESR). Best performances are obtained with good high frequency characteristics capacitors and low ESR. The best compromise for the value of the Output Capacitance is 47µF Tantalum Capacitor; Lower values may cause higher Output Ripple Voltage and lower Efficiency without compromising the functionality of the device. An Input Capacitor is required to compensate, if present, the series impedance between the Supply Voltage Source and the Input Voltage of the Application. A 47µH inductor is recommended for most APE2902 applications. However, the inductance value is not critical, and the APE2902 will work with inductors in the 33µH to 120µH. Schottky diodes with higher current ratings usually have lower forward voltage drop, larger diode capacitance and fast reverse recovery, it is the ideal choices for APE2902 applications. The forward voltage drop of a Schottky diode represents the conduction losses in the system, while the diode capacitance (CT or CD) represents the switching losses. For diode selection, both forward voltage drop and diode capacitance need to be considered. When laying out the PC board, the following suggestions should be taken to ensure proper operation of the APE2902. These items are also illustrated graphically in below. 1. The power traces, including the GND trace, the SW trace and the VIN trace should be kept short, direct and wide to allow large current flow. Put enough multiply-layer pads when they need to change the trace layer. 2. Do not trace signal line under inductor. |
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