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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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RT9204CS датащи(PDF) 12 Page - Richtek Technology Corporation |
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RT9204CS датащи(HTML) 12 Page - Richtek Technology Corporation |
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12 / 14 page  RT9204 Preliminary www.richtek-ic.com.tw DS9204-00 February 2002 12 The power components and the PWM controller should be placed firstly. Place the input capacitors, especially the high-frequency ceramic decoupling capacitors, close to the power switches. Place the output inductor and output capacitors between the MOSFETs and the load. Also locate the PWM controller near by MOSFETs. A multi-layer printed circuit board is recommended. Fig.11 shows the connections of the critical components in the converter. Note that the capacitors CIN and COUT each of them represents numerous physical capacitors. Use a dedicated grounding plane and use vias to ground all critical components to this layer. Apply another solid layer as a power plane and cut this plane into smaller islands of common voltage levels. The power plane should support the input power and output power nodes. Use copper filled polygons on the top and bottom circuit layers for the PHASE node, but it is not necessary to oversize this particular island. Since the PHASE node is subjected to very high dV/dt voltages, the stray capacitance formed between these island and the surrounding circuitry will tend to couple switching noise. Use the remaining printed circuit layers for small signal routing. The PCB traces between the PWM controller and the gate of MOSFET and also the traces connecting source of MOSFETs should be sized to carry 2A peak currents. Fig. 11 + + + LOAD RT9204 VCC GND FB UGATE VOUT IQ1 IL Q1 IQ2 5V GND PHASE |
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