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L6920DTR 데이터시트(PDF) 6 Page - STMicroelectronics |
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6 / 13 page L6920 6/13 Figure 7. PFM mode Condition: Vout = 5V; Vin =1.5V. Trace1: Vout (50mV~/div) Trace 4: IL (100mA/div) Time div.: 5 µs/div Figure 8. Heavier load - Train pulses overlapping. Trace1: Vout (100mV~/div) Trace 4: IL (200mA/div) Time div.: 10 µs/div Figure 9. Heavy load - Inductor current ripples below Ilim Trace1: Vout (100mV~/div) Trace 4: IL (200mA/div) Time div.: 20 µs/div Figure 10. Heavy load and High ESR. Regulation falls in continuous mode of operation. Trace1: Vout (100mV~/div) Trace 4: IL (200mA/div). Time div.: 5 µs/div When Iload is heavier, the pulse trains are overlapped. Figures 7 - 8 show some possible behaviors. Considering that current in the inductor is limited to 1A, the maximum load current is defined by the following relationship: eq. (1) Where η is the efficiency and Ilim =1A. Of course, if Iload is greater than Iload_lim the regulation is lost (figure 11). I load_lim V in V out ----------- I lim Toff min – V out V in – 2L ⋅ -------------------------- ⋅ ⎝⎠ ⎛⎞ η ⋅⋅ = |
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