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L6374 Scheda tecnica(PDF) 6 Page - STMicroelectronics |
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L6374 Scheda tecnica(HTML) 6 Page - STMicroelectronics |
6 / 13 page 3 STATE / PUSH-PULL INPUT The input 3st/Pp is instead intended for a digital incoming signal. It has an internal threshold set at 1.26V; an internal bias circuit (10 µA typical) simu- lates a high level (three-state) if the pin is discon- nected. THE SWITCHING OF THE OUTPUT STAGE The cross conduction of the two transistors of an output stage of the L6374 would be significantly noisy, because the transistors here can carry peak currents in excess of 100mA, and even more in the few nanoseconds before the current limiting circuits are really effective. Consequently the device has been designed so as to avoid such cross conduction. At every switching transition, first of all the transistor in conduction is turned off. Then, after a safe inter- val of around 200ns, the other transistor is turned on. When analyzing the switching cycle, and the as- sociated switching times, it is useful to identify some subsequent phases: - delay from the input pin to the output reaction; - off transition in the output stage; - dead time; - on transition in the output stage. Figure 4 helps understand such sequence. In Figure 4: VS = 35V, 350 Ω connected to VS/2. Vref Vi Vs Vout Hys2 Hys2 22 D94IN073 Figure 3: Input Comparator Threshold L6374 6/13 |
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