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LM2575S-12 Scheda tecnica(PDF) 11 Page - National Semiconductor (TI) |
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LM2575S-12 Scheda tecnica(HTML) 11 Page - National Semiconductor (TI) |
11 / 27 page Typical Performance Characteristics (Circuit of Figure 2) (Continued) Feedback Pin Current Maximum Power Dissipation (TO-263) (See (Note 12)) 01147505 01147528 Switching Waveforms Load Transient Response 01147506 VOUT =5V A: Output Pin Voltage, 10V/div B: Output Pin Current, 1A/div C: Inductor Current, 0.5A/div D: Output Ripple Voltage, 20 mV/div, AC-Coupled Horizontal Time Base: 5 µs/div 01147507 Test Circuit and Layout Guidelines As in any switching regulator, layout is very important. Rap- idly switching currents associated with wiring inductance generate voltage transients which can cause problems. For minimal inductance and ground loops, the length of the leads indicated by heavy lines should be kept as short as possible. Single-point grounding (as indicated) or ground plane con- struction should be used for best results. When using the Adjustable version, physically locate the programming resis- tors near the regulator, to keep the sensitive feedback wiring short. www.national.com 11 |
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