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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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MPZ2012S221A датащи(PDF) 20 Page - STMicroelectronics |
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MPZ2012S221A датащи(HTML) 20 Page - STMicroelectronics |
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20 / 56 page  The dependency of the isolated output voltage on the leakage is demonstrated by Figure 22, where the load regulations with two different transformers are compared. The optimized solution implements the same inductor of the demoboard described in section Section 11 , (ZB1346-AE, whose leakage inductance is around 1% of the magnetizing inductance, as typically recommended). The not optimized solution consists of the use of a transformer with a higher leakage inductance (twice as much the other transformer). Figure 22. Effect of the transformer leakage inductance on the isolated output load regulation (VIN = 12 V, VOUT_prim = 5 V, N = 6) -30% -20% -10% 0% 10% 20% 30% 0 0.05 0.1 0.15 0.2 0.25 0.3 Isolated output current [A] Optimized leakage inductance Not optimized leakage inductance 6.3 Efficiency Primary output Figure 23 shows the efficiency referred to the primary output, at two different input voltages, achieving a peak value of almost 90%. Figure 23. Primary output efficiency (VOUT_prim = 5 V, fSW = 400 kHz, secondary isolated output not loaded) 0% 10% 20% 30% 40% 50% 60% 70% 80% 90% 100% 0 0,5 1 1,5 2 2,5 3 Primary output current [A] Vin = 12 V Vin = 24 V 90 % ≈ Figure 24 compares instead the efficiency trends depending on the switching frequency, whose effect dominates at lower currents. L6983I Efficiency DS14040 - Rev 1 page 20/56 |
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