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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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SC21150ACSTRT датащи(PDF) 17 Page - Semtech Corporation |
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SC21150ACSTRT датащи(HTML) 17 Page - Semtech Corporation |
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17 / 20 page  SC21150 7 PCB Layout Guidelines An optimum layout for the SC250 is shown below. When doing the PCB layout the following guidelines should be used: The input capacitor must be located as close as possible to the IC and directly connected to pins A2 (VIN) and A (GND). The LX trace from pin B to the inductor should be as short as possible, and wide to reduce IR loss and improve heat dissipation. The output capacitor should be close to the inductor. The feedback components (Rtop, Ctop, Rbot, for adjustable VOUT) should be located as close as possible to the FB pin. For the ground connection to Rbot, use a via to a ground plane and place another via near the A (GND) pin of the IC. The FB trace should be short and not routed near noise signals. Do not route the FB trace under the inductor; the high impedance of the FB circuit can pick up noise from the inductor’s magnetic field. CIN L1 COUT VOUT VIN SC21150 GND LX FB SC21150 PCB Layout |
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