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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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MIC2169 датащи(PDF) 13 Page - Micrel Semiconductor |
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MIC2169 датащи(HTML) 13 Page - Micrel Semiconductor |
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13 / 14 page  November 2003 13 M9999-111803 MIC2169 Micrel Design Example Layout and Checklist: 1. Connect the current limiting (CS) resistor directly to the drain of top MOSFET Q1. 2. Connect the VSW pin directly to the source of top MOSFET Q1 thru a 4 Ω to 10Ω resistor. The pur- pose of the resistor is to filter the switch node. 3. The feedback resistors R1 and R2 should be placed close to the FB pin. The top side of R1 should connect directly to the output node. Run this trace away from the switch node (junction of Q1, Q2, and L1). The bottom side of R1 should connect to the GND pin on the MIC2169. 4. The compensation resistor and capacitors should be placed right next to the COMP/EN pin and the other side should connect directly to the GND pin on the MIC2169 rather than going to the plane. 5. The input bulk capacitors should be placed close to the drain of the top MOSFET. 6. The 1 µF ceramic capacitor should be placed right on the VIN pin of the MIC2169. 7. The 4.7 µF to 10µF ceramic capacitor should be placed right on the VDD pin. 8. The source of the bottom MOSFET should connect directly to the input capacitor GND with a thick trace. The output capacitor and the input capacitor should connect directly to the GND plane. 9. Place a 0.1 µF ceramic capacitor in parallel with the CS resistor to filter any switching noise. |
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