| Part Numbert | Mfg | Packt | D/C | Descriptiont | Qty | Company/Contact |
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PC1601LRSLSOH PC1601LRSLSOH PC1601LRSLSOH Datasheet A 9 bit up counter is used to measure the period between to successive zero crossings. This "pe- riod counter" counts a frequency that is FREF/2E6 = FREF/64. When a new zero crossing is detected, the period counter will transfer its contents to the 6 bit down counter that is the real "mask counter". The up counter will then reset to zero and com- mence the counting of the following period. Since that the mask counter uses a frequency that is FREF/2E7 = FREF/128, that is half of the fre- quency used by the up counter, the final masking time will be one fourth of the period between to successive zero crossings or, in other terms, 15 electrical degrees. During start up, when the period is quite large, the period counter will saturate when all bit are in "1" state, providing a maximum mask interval. As the motor speed increases, a fixed masking time will be applied until the period between two commuta- tions is less than the maximum time of the period counter. This means that the masking time will be propor- tional for commutations period that are less than PC1601LRSLSOH PC1601LRSLSOH PC1601LRSLSOH Price Any parasitic switching transients during the rise and fall edges of the incoming clock are not part of the clock feedth rough specifications. Switching transients have fre- quency contents much higherthan the applied clock; their amplitude strongly depends on scope probing techniques as well as grounding and power supply bypassing. The clock feedthrough can be reduced, if bothersome, by adding a single RClowpassfilter at the output pin (8) of the LTC1069-1. PC1601LRSLSOH PC1601LRSLSOH PC1601LRSLSOH on stock
When a transition of the PHASE input occurs, CT is discharged to near ground during the crossover delay time (the crossover delay time is present to prevent simultaneous conduction of the source and sink drivers) After the crossover delay, CT iS charged by an internal current source of approximately l mA. The comparator output remains blanked until the voltage on CT reaches approximately 3 volts. |
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