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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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ZXSC100X8 датащи(PDF) 13 Page - Diodes Incorporated |
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ZXSC100X8 датащи(HTML) 13 Page - Diodes Incorporated |
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13 / 17 page  ZXSC100 SEMICO NDUC TORS ISSUE 3 - JANUARY 2004 13 Layout issues Layout is critical for the circuit to function optimally in terms of electrical efficiency, thermal considerations and noise. For ‘step-up converters’ there are four main current loops, the input loop, power-switch loop, rectifier loop and output loop. The supply charging the input capacitor forms the input loop. The power-switch loop is defined when Q1 is ‘on’, current flows from the input through the inductor, Q1, RSENSE and to ground. When Q1 is ‘off’, the energy stored in the inductor is transferred to the output capacitor and load via D1, forming the rectifier loop. The output loop is formed by the output capacitor supplying the load when Q1 is switched back off. To optimise for best performance each of these loops should be kept separate from each other and interconnections made with short, thick traces thus minimising parasitic inductance, capacitance and resistance. Also the sense resistor R2 should be connected, with minimum trace length, between emitter lead of Q1 and ground, again minimising stray parasitics. The layout for the 0.33W solution is shown below. Top silk Drill holes Actual Size Bottom Copper Top Copper 0.33W solution demo board layout |
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