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FAN5350MPX датащи(PDF) 8 Page - Fairchild Semiconductor |
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FAN5350MPX датащи(HTML) 8 Page - Fairchild Semiconductor |
8 / 15 page © 2007 Fairchild Semiconductor Corporation www.fairchildsemi.com FAN5350 Rev. 1.0.3 8 PCB Layout Guidelines For the bill of materials of the FAN5350 evaluation board, see Table 1. There are only three external components: the inductor and the input and output capacitors. For any buck switcher IC, including the FAN5350, it is always important to place a low-ESR input capacitor very close to the IC, as shown in Figure 7. That ensures good input decoupling, which helps reduce the noise appearing at the output terminals and ensures that the control sections of the IC do not behave erratically due to excessive noise. This reduces switching cycle jitter and ensures good overall performance. It is not considered critical to place either the inductor or the output capacitor very close to the IC. There is some flexibility in moving these two components further away from the IC. Table 2. FAN5350 Evaluation Board Bill of Materials (optional parts are installed by request only) Figure 7. The FAN5350 Evaluation Board PCB (CSP) Feedback Loop One key advantage of the non-linear architecture is that there is no traditional feedback loop. The loop response to changes in VOUT is essentially instantaneous, which explains its extraordinary transient response. The absence of a traditional, high-gain compensated linear loop means that the FAN5350 is inherently stable over a wide range of LOUT and COUT. LOUT can be reduced further for a given application, provided it is confirmed that the calculated peak current for the required maximum load current is less than the minimum of the closed-loop current limit. The advantage is that this generally leads to improved transient response, since a small inductance allows for a much faster increase in current to cope with any sudden load demand. The inductor can be increased to 2.2µH; but, for the same reason, the transient response gets slightly degraded. In that case, increasing the output capacitor to 10µF helps significantly. Description Qty. Ref. Vendor Part Number 1.2 μH, 1.8A, 55mΩ TOKO 1117AS-1R2M 1.3 μH, 1.2A, 90mΩ FDK MIPSA2520D1R0 Inductor 1.5 μH, 1.3A 1 L1 Taiyo Yuden CBC3225T15MR Capacitor 4.7 μF, ±10%, 6.3V, X5R, 0603 2 CIN,COUT MURATA GRM39 X5R 475K 6.3 IC DC/DC Regulator in CSP, 5 bumps 1 U1 Fairchild FAN5350UCX Load Resistor (Optional) 1 RLOAD Any |
Аналогичный номер детали - FAN5350MPX |
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Аналогичное описание - FAN5350MPX |
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