| FIGURE 2 | |||||||||
| Figure 2A | Figure 2B | ||||||||
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| Ripple current at the switched-mode regulator's switching frequency causes ESR-induced noise steps. Fast-rising current edges cause ESL-induced hash spikes (a). The photo in (b) clearly shows the effects of ESR and capacitance, but the ESL-induced high-frequency spikes aren't visible. This 175-kHz, 5 to 12V converter operates in the discontinouos mode, so the ESR stes exist only at leading edges of the triangular current waveform. | |||||||||
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