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L6219R Arkusz danych(PDF) 11 Page - STMicroelectronics |
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L6219R Arkusz danych(HTML) 11 Page - STMicroelectronics |
11 / 16 page L6219R Functional description 11/16 3.4 Single-pulse Generator The pulse generator is a monostable triggered on the positive going edge of the comparator output.The monostable output is high during the pulse time, toff , which is determined by the time components Rt and Ct. toff = 1.1 · RtCt The single pulse switches off the power feed to the motor winding, causing the winding current to decrease during toff.If a new trigger signal should occur during toff, it is ignored. 3.5 Output Stage The output stage contains four Darlington transistors (source drivers) four saturated transistors (sink drivers) and eight diodes, connected in two H bridge. Figure 4. Principle Operating Sequence The source transistors are used to switch the power supplied to the motor winding, thus driving a constant current through the winding.It should be noted however, that is not permitted to short circuit the outputs. Internal circuitry is added in order to increase the accuracy of the motor current particularly with low current levels. 3.6 VS, VSS, VRef The circuit will stand any order of turn-on or turn-off the supply voltages VS and VSS. Normal dV/dt values are then assumed. Preferably, VRef should be tracking VSS during power-on and power-off if VS is established. |
Podobny numer części - L6219R |
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Podobny opis - L6219R |
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