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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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MAX15021 датащи(PDF) 20 Page - Maxim Integrated Products |
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MAX15021 датащи(HTML) 20 Page - Maxim Integrated Products |
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20 / 24 page  Applications Information PCB Layout Guidelines Careful PCB layout is critical to achieve clean and sta- ble operation. Follow these guidelines for good PCB layout: 1) Place decoupling capacitors as close as possible to the IC pins. 2) Keep SGND and PGND isolated and connect them at one single point close to the negative terminal of the input filter capacitor. 3) Route high-speed switching nodes away from sensi- tive analog areas (FB_, COMP_, and EN_). 4) Distribute the power components evenly across the board for proper heat dissipation. 5) Ensure timing resistor and all feedback connections are short and direct. Place feedback resistors as close as possible to the IC. 6) Place the bank of the output capacitors close to the load. 7) Connect the MAX15021 exposed pad to a large copper plane to maximize its power dissipation capability. Connect the exposed pad to SGND plane. Do not connect the exposed pad to the SGND pin directly underneath the IC. 8) Use 2oz. copper to keep trace inductance and resistance to a minimum. Thin copper PCBs can compromise efficiency since high currents are involved in the application. Also thicker copper con- ducts heat more effectively, thereby reducing ther- mal impedance. 9) A reference PCB layout included in the MAX15021 Evaluation Kit is also provided to further aid layout. Dual, 4A/2A, 4MHz, Step-Down DC-DC Regulator with Tracking/Sequencing Capability MAX15021 20 Maxim Integrated |
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