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LM2903AVQDRQ1 Scheda tecnica(PDF) 8 Page - Texas Instruments |
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LM2903AVQDRQ1 Scheda tecnica(HTML) 8 Page - Texas Instruments |
8 / 18 page ±1 0 1 2 3 4 5 6 -0.25 0.25 0.75 1.25 1.75 2.25 Time (usec) 5mV OD 20mV OD 100mV OD C004 ±1 0 1 2 3 4 5 6 ±0.25 0.00 0.25 0.50 0.75 1.00 1.25 1.50 1.75 2.00 Time (usec) 5mV OD 20mV OD 100mV OD C006 LM2903-Q1 SLCS141E – MAY 2003 – REVISED JULY 2014 www.ti.com 2. When IN- is higher than common mode and IN+ is within common mode, the output is low and the output transistor is sinking current 3. 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 4. 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). In order to make an accurate comparison the Overdrive Voltage (VOD) should 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 6 & Figure 7 show positive and negative response times with respect to overdrive voltage. 9.2.2.3 Output & Drive Current Output current is determined by the load/pull-up resistance and logic/pull-up voltage. The output current will produce a output low voltage (VOL) from the comparator. In which VOL is proportional to the output current. Use Figure 3 to determine VOL based on the output current. The output current can also effect the transient response. More will be explained in the next section. 9.2.2.4 Response Time The transient response can be determined by the load capacitance (CL), load/pull-up resistance (RPULLUP) and equivalent collector-emitter resistance (RCE). • The positive response time ( τp) is approximately τP ~ RPULLUP x CL • The negative response time ( τN) is approximately τN ~ RCE x CL – RCE can be determine by taking the slope of Figure 3 in it's linear region at the desired temperature, or by dividing the VOL by Iout 9.2.3 Application Curves The following curves were generated with 5 V on VCC & VLogic, RPULLUP = 5.1 kΩ, and 50 pF scope probe. Figure 6. Response Time for Various Overdrives (Positive Figure 7. Response Time for Various Overdrives (Negative Transition) Transition) 8 Submit Documentation Feedback Copyright © 2003–2014, Texas Instruments Incorporated Product Folder Links: LM2903-Q1 |
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