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Motore di ricerca datesheet componenti elettronici |
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LM311H Scheda tecnica(PDF) 11 Page - National Semiconductor (TI) |
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LM311H Scheda tecnica(HTML) 11 Page - National Semiconductor (TI) |
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11 / 23 page  8.0 Application Hints (Continued) 7. When both inputs of the LM111 are connected to active signals, or if a high-impedance signal is driving the positive input of the LM111 so that positive feedback would be disruptive, the circuit of Figure 1 is ideal. The positive feedback is to pin 5 (one of the offset adjust- ment pins). It is sufficient to cause 1 to 2 mV hysteresis and sharp transitions with input triangle waves from a few Hz to hundreds of kHz. The positive-feedback signal across the 82 Ω resistor swings 240 mV below the posi- tive supply. This signal is centered around the nominal voltage at pin 5, so this feedback does not add to the V OS of the comparator. As much as 8 mV of VOS can be trimmed out, using the 5 k Ω pot and 3 kΩ resistor as shown. 8. These application notes apply specifically to the LM111, LM211, LM311, and LF111 families of comparators, and are applicable to all high-speed comparators in general, (with the exception that not all comparators have trim pins). 00570429 Pin connections shown are for LM111H in the H08 hermetic package FIGURE 1. Improved Positive Feedback 00570430 Pin connections shown are for LM111H in the H08 hermetic package FIGURE 2. Conventional Positive Feedback www.national.com 11 |
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