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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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PM6670S датащи(PDF) 39 Page - STMicroelectronics |
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PM6670S датащи(HTML) 39 Page - STMicroelectronics |
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39 / 53 page  PM6670S Application information 39/53 where Equation 27a Equation 27b Referring to the typical application schematic (figure in cover page and Figure 29), the final expression is then: Equation 28 The switching frequency directly affects two parameters: ● Inductor size: greater frequencies mean smaller inductances. In notebook applications, real estate solutions (i.e. low-profile power inductors) are mandatory also with high saturation and r.m.s. currents. ● Efficiency: switching losses are proportional to the frequency. Generally, higher frequencies imply lower efficiency. Even if the switching frequency is theoretically independent from battery and output voltages, parasitic parameters involved in power path (like MOSFETs on-resistance and inductor DCR) introduce voltage drops responsible for a slight dependence on load current. In addition, the internal delay is due to a light dependence on input voltage. Table 12. Typical values for switching frequency selection R1 (k Ω)R2 (kΩ) Approx switching frequency (kHz) 330 11 250 330 13 300 330 15 350 330 18 400 330 20 450 330 22 500 IN OSC OSC V V = α OUT SNS OUT V V = α OSC 2 1 2 OSC OSC SW K 1 R R R K f ⋅ + = α = |
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