De_User (21.11.2005 20:11, просмотров: 1) ответил De_User на Подскажите PIN2PIN аналог LM393/LM2903 - наступил на грабли с negative Voltage overdrive.
цитата из datasheet. Короче, ХЗ куда установится выход при большом входном сигнале. А снизить амплитуду входнрого сигналя пульсациии по +5В не позволяют Note 3: This input current will only exist when the voltage at any of the input leads is driven negative. It is due to the collector-base junction of the input PNP
transistors becoming forward biased and thereby acting as input diode clamps. In addition to this diode action, there is also lateral NPN parasitic transistor action on the IC chip. This transistor action can cause the output voltages of the comparators to go to the V+ voltage level (or to ground for a large overdrive) for the time duration that an input is driven negative. This is not destructive and normal output states will re-establish when the input voltage, which was negative, again returns to a value greater than −0.3V.
LM193/LM293/LM393/LM2903
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