| FIGURE 4 | |
| Figire 4A | Figure 4B |
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| When heavily loaded, the MAX782 battery-powered dc/dc converter operates as a fixed-frequency PWM, concentrating its noise at the 300-kHz fundamental switching frequency and associated harmonics (a). At lighter loads, the circuit automatically switches to PFM mode. Then, a judicious selection of components keeps the switching noise above 20 kHz for all loads greater than 50 mA (b). | |
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