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L4978 Datasheet(PDF) 9 Page - STMicroelectronics |
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L4978 Datasheet(HTML) 9 Page - STMicroelectronics |
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9 / 12 page  Figure 21. Load transient. 10 103 105 107 f(Hz) 102 104 106 108 -200 -150 -100 -50 GAIN (dB) 0 50 Phase 0 45 90 135 D97IN787 GAIN Phase Figure 25. Open loop frequency and phase of er- ror amplifier 15 20 25 30 35 40 45 50 VCCmax(V) 0 100 200 300 400 L ( µH) D97IN745 680nF fsw=100KHz 470nF 330nF 220nF 100nF Figure 23. Soft start capacitor selection Vs in- ductor and Vccmax. 2 1 D97IN786 VCC (V) 30 20 10 VO (mV) 100 0 -100 1ms/DIV IO = 1A fsw = 100KHz Figure 22. Line transient. 15 20 25 30 35 40 45 50 VCCmax(V) 0 100 200 300 L ( µH) 56nF fsw=200KHz D97IN746 47nF 33nF 22nF Figure 24. Soft start capacitor selection vs. In- ductor and Vccmax. L4978 9/12 |
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