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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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SC403B датащи(PDF) 27 Page - Semtech Corporation |
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SC403B датащи(HTML) 27 Page - Semtech Corporation |
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27 / 32 page  27 SC403B Applications Information (continued) The output inductor value may change with current. This will change the output ripple and therefore will have a minor effect on the DC output voltage. The output ESR also affects the output ripple and thus has a minor effect on the DC output voltage. Switching Frequency Variation The switching frequency will vary depending upon line and load conditions. The line variation is a result of fixed propagation delays in the on-time one-shot, as well as unavoidable delays in the external MOSFET switching. As V IN increases, these factors make the actual DH on-time slightly longer than the ideal on-time. The net effect is that frequency tends to falls slightly with increasing input voltage. The switching frequency also varies with load current as a result of the power losses in the MOSFETs and the induc- tor. For a conventional PWM constant-frequency con- verter, as load increases the duty cycle also increases slightly to compensate for IR and switching losses in the MOSFETs and inductor. A constant on-time converter must also compensate for the same losses by increasing the effective duty cycle (more time is spent drawing energy from V IN as losses increase). The on-time is essen- tially constant for a given V OUT/VIN combination, to offset the losses the off-time will tend to reduce slightly as load increases. The net effect is that switching frequency increases slightly with increasing load. |
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