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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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SC668 датащи(PDF) 23 Page - Semtech Corporation |
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SC668 датащи(HTML) 23 Page - Semtech Corporation |
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23 / 46 page  SC668 23 Applications Information (continued) PCB Layout Considerations The layout diagram in Figure 16 illustrates a two-layer PCB layout for the SC668 and supporting components. F o l l o w i n g f u n d a m e n t a l l a y o u t r u l e s i s critical for achieving the performance specified in the Electrical Characteristics table. The following guidelines are recommended when developing a PCB layout: Place all bypass and decoupling capacitors — C IN, CLDO1, CLDO2, CLDO3, CLDO4, and CBYP as close to the device as possible. Ensure that all connections to pins IN and OUT make use of wide traces so that the resistive drop on each connection is minimized. The thermal pad should be connected to the ground plane using multiple vias to ensure proper thermal connection for optimal heat transfer. The following capacitors — C LDO1, CLDO2, CLDO3, C LDO4, and CBYP should be grounded together. Connect these capacitors to the ground plane at one point near the SC668 as shown in Figure 16. • • • • Figure 17 shows the component copper layer. Make all ground connections to a solid ground plane as shown in Figure 18. All LDO output traces should be made as wide as possible to minimize resistive losses. • • Figure 16 — Recommended PCB Layout Figure 17 — Layer 1 Figure 18 — Layer 2 CLDO1 BL8 BL7 PWM SDA SCL LDO1 BL1 VIN SC668 GND VIN ADI CBYP GND GND Ground Plane CIN CLDO2 CLDO3 CLDO4 |
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