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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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SC2620 датащи(PDF) 22 Page - Semtech Corporation |
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SC2620 датащи(HTML) 22 Page - Semtech Corporation |
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22 / 26 page  22 2006 Semtech Corp. www.semtech.com SC2620 POWER MANAGEMENT Suggested PCB Layout for the SC2620. Figure 15. C2 L2 D3 L1 C15 D4 D1 D2 C1 C3 R3 R4 C9 R7 C8 C16 C7 C6 R5 C5 C10 R6 R9 R10 R1 R2 C4 R20 GND GND AGND OUT2 OUT1 IN IN or OUT1 IN U1 C2 L2 D3 L1 C15 D4 D1 D2 C1 C3 R3 R4 C9 R7 C8 C16 C7 C6 R5 C5 C10 R6 R9 R10 R1 R2 C4 R20 GND GND AGND OUT2 OUT1 IN IN or OUT1 IN U1 start capacitors and the VIN filtering capacitor C 16 are to be tied to the analog ground. The frequency-setting resistor R 9 is placed next to the ROSC pin and is also connected to the analog ground. R 20 is a 0Ω resistor that connects the analog ground to the power ground at a single point. Applications Information The exposed pad should be soldered to a large analog ground plane as the analog ground copper acts as a heat sink for the device. To ensure proper adhesion to the ground plane, avoid using vias directly under the device. In figure 15 two 12mil vias are placed at the edge of the underside pad. |
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