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RT9205 Fiches technique(PDF) 14 Page - Richtek Technology Corporation |
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RT9205 Fiches technique(HTML) 14 Page - Richtek Technology Corporation |
14 / 16 page RT9205/A Preliminary www.richtek.com DS9205/A-03 May 2003 14 MOSFETs and the load. Also locate the PWM controller near by MOSFETs. A multi-layer printed circuit board is recommended. Fig.13 shows the connections of the critical components in the converter. Note that the capacitors CIN and COUT represent 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 islands 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. 13 + + + LOAD RT9205/A VCC GND FB LGATE UGATE VOUT IQ1 IL Q1 Q2 IQ2 5V GND |
Numéro de pièce similaire - RT9205 |
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Description similaire - RT9205 |
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