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FAN2013MPX Datasheet(PDF) 7 Page - Fairchild Semiconductor |
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FAN2013MPX Datasheet(HTML) 7 Page - Fairchild Semiconductor |
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7 / 9 page  © 2006 Fairchild Semiconductor Corporation www.fairchildsemi.com FAN2013 Rev. 1.0.0 7 Applications Information Setting the Output Voltage The internal voltage reference, VREF, is 0.8V. The output is divided down by a voltage divider, R1 and R2 to the FB pin. The output voltage is: According to this equation, assuming desired output volt- age of 1.2V, and given R2 = 10K Ω, the calculated value of R1 is 5K Ω. Inductor Selection The inductor parameters directly related to device perfor- mance are saturation current and DC resistance. The FAN2013 operates with a typical inductor value of 2.2µH. The lower the DC resistance, the higher the efficiency. For saturation current, the inductor should be rated higher than the maximum load current, plus half of the inductor ripple current, calculated by: where: ΔI L = Inductor Ripple Current f = Switching Frequency L = Inductor Value Recommended inductors are listed in Table 1. Table 1: Recommended Inductors Capacitors Selection For best performance, a low-ESR input capacitor is required. A ceramic capacitor of at least 10µF, placed as close to the VIN and AGND pins as possible, is recom- mended. The output capacitor determines the output voltage rip- ple and the transient response. A minimum 20µF output capacitor is required for the FAN2013 to operate in sta- ble conditions. Table 2: Recommended Capacitors PCB Layout Recommendations The inherently high peak currents and switching fre- quency of power supplies require careful PCB layout design. For best results, use wide traces for high-current paths and place the input capacitor, the inductor, and the output capacitor as close as possible to the integrated circuit terminals. To minimize voltage stress to the device resulting from ever-present switching spikes, use an input bypass capacitor with low ESR. Note that the peak amplitude of the switching spikes depends upon the load current; the higher the load current, the higher the switching spikes. The resistor divider that sets the output voltage should be routed away from the inductor to avoid RF coupling. The ground plane at the bottom side of the PCB acts as an electromagnetic shield to reduce EMI. The recom- mended PCB layout is shown in Figure 11. Figure 11. Recommended PCB Layout Inductor Value Vendor Part Number 2.2µH Coiltronics SD25 2R2 2.2µH Murata LQH66SSN2R2M03 Capacitor Value Vendor Part Number 10µF Taiyo Yuden JMK212BJ106MG JMK316BJ106KL TDK C2012X5ROJ106K C3216X5ROJ106M Murata GRM32ER61C106K V OUT V REF 1 R 1 R 2 ------- + ⎝⎠ ⎛⎞ = ΔI L V OUT 1V OUT V IN ⁄ () – Lf × ------------------------------------------ × = EQ 2 EQ 3 |
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