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LM339BIDR Arkusz danych(PDF) 24 Page - Texas Instruments |
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LM339BIDR Arkusz danych(HTML) 24 Page - Texas Instruments |
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24 / 48 page  The following list describes the outcomes of some input voltage situations. • When both IN– and IN+ are both within the common-mode range: – If IN– is higher than IN+ and the offset voltage, the output is low and the output transistor is sinking current – If IN– is lower than IN+ and the offset voltage, the output is high impedance and the output transistor is not conducting • When IN– is higher than common mode and IN+ is within common mode, the output is low and the output transistor is sinking current • When IN+ is higher than common mode and IN– is within common mode, the output is high impedance and the output transistor is not conducting • When IN– and IN+ are both higher than common mode, the output is low and the output transistor is sinking current 9.2.2.2 Minimum Overdrive Voltage Overdrive voltage is the differential voltage produced between the positive and negative inputs of the comparator over the offset voltage (VIO). To make an accurate comparison, the overdrive voltage (VOD) must be higher than the input offset voltage (VIO). Overdrive voltage can also determine the response time of the comparator, with the response time decreasing with increasing overdrive. Figure 9-2 and Figure 9-3 show positive and negative response times with respect to overdrive voltage. 9.2.2.3 Output and Drive Current Output current is determined by the load and pullup resistance and logic and pullup voltage. The output current produces a low-level output voltage (VOL) from the comparator, where VOL is proportional to the output current. The output current can also effect the transient response. 9.2.2.4 Response Time Response time is a function of input over-drive. See the Section 7.19 graphs for typical response times. The rise and fall times can be determined by the load capacitance (CL), load/pull-up resistance (RPULLUP) and equivalent collector-emitter resistance (RCE). • The rise time (τR) is approximately τR~ RPULLUP × CL • The fall time (τF) is approximately τF ~ RCE × CL – RCE can be determined by taking the slope of Figure 7-35 in its linear region at the desired temperature, or by dividing the VOL by IOUT LM139, LM239, LM339, LM339B, LM139A, LM239A LM339A, LM2901B, LM2901, LM2901AV, LM2901V SLCS006V – OCTOBER 1979 – REVISED DECEMBER 2022 www.ti.com 24 Submit Document Feedback Copyright © 2022 Texas Instruments Incorporated Product Folder Links: LM139 LM239 LM339 LM339B LM139A LM239A LM339A LM2901B LM2901 LM2901AV LM2901V |
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