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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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LM2674 датащи(PDF) 23 Page - National Semiconductor (TI) |
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LM2674 датащи(HTML) 23 Page - National Semiconductor (TI) |
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23 / 26 page  Application Information (Continued) Layout is very important in switching regulator designs. Rap- idly switching currents associated with wiring inductance can generate voltage transients which can cause problems. For minimal inductance and ground loops, the wires indicated by heavy lines (in Figure 2 and Figure 3) should be wide printed circuit traces and should be kept as short as possible. For best results, external components should be located as close to the switcher IC as possible using ground plane construction or single point grounding. If open core inductors are used, special care must be taken as to the location and positioning of this type of induc- tor. Allowing the inductor flux to intersect sensitive feedback, IC ground path, and C OUT wiring can cause problems. When using the adjustable version, special care must be taken as to the location of the feedback resistors and the associated wiring. Physically locate both resistors near the IC, and route the wiring away from the inductor, especially an open core type of inductor. LLP Package Devices The LM2674 is offered in the 16 lead LLP surface mount package to allow for increased power dissipation compared to the SO-8 and DIP. The Die Attach Pad (DAP) can and should be connected to PCB Ground plane/island. For CAD and assembly guide- lines refer to Application Note AN-1187 at http:// power.national.com. www.national.com 23 |
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