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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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MIC4721 датащи(PDF) 14 Page - Micrel Semiconductor |
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MIC4721 датащи(HTML) 14 Page - Micrel Semiconductor |
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14 / 19 page  Micrel, Inc. MIC4721 May 2007 14 M9999-052907-A 5VIN and 1.8VOUT at 1.5A load; • Phase Margin = 43.1 Degrees • GBW = 218KHz The non-synchronous MIC4721 regulator only has the ability to source current. This means that the regulator must rely on the load to sink current. This causes a non- linear response at light loads. The following plot shows the effects of the pole created by the nonlinearity of the output drive during light load (discontinuous) conditions. 3.3VIN and 1.8VOUT IOUT = 50mA; • Phase Margin = 90.5 Degrees • GBW = 64.4KHz Feed Forward Capacitor The feedback resistors are a gain reduction block in the overall system response of the regulator. By placing a capacitor from the output to the feedback pin, high frequency signal can bypass the resistor divider, causing a gain increase up to unity gain. The graph above shows the effects on the gain and phase of the system caused by feedback resistors and a feedforward capacitor. The maximum amount of phase boost achievable with a feedforward capacitor is graphed below. By looking at the graph, phase margin can be affected to a greater degree with higher output voltages. The next bode plot shows the phase margin of a 1.8V output at 1.5A without a feedforward capacitor. |
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