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LMV7235M7X Datasheet(PDF) 10 Page - Texas Instruments |
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LMV7235M7X Datasheet(HTML) 10 Page - Texas Instruments |
10 / 22 page LMV7235, LMV7239 SNOS532M – SEPTEMBER 2000 – REVISED FEBRUARY 2013 www.ti.com When VIN is greater than VA (VIN > VA), the output voltage is low, very close to ground. In this case the three network resistors can be presented as R2 || R3 in series with R1. The upper trip voltage VA2 is defined as: VA2 = VCC (R2||R3) / [(R1)+ (R2||R3)] (2) The total hysteresis provided by the network is defined as: Delta VA = VA1- VA2 (3) To assure that the comparator will always switch fully to VCC and not be pulled down by the load the resistors, values should be chosen as follows: RPULL-UP << RLOAD (4) Figure 18. Inverting Comparator with Hysteresis NON-INVERTING COMPARATOR WITH HYSTERESIS A non inverting comparator with hysteresis requires a two resistor network, and a voltage reference (VREF) at the inverting input. When VIN is low, the output is also low. For the output to switch from low to high, VIN must rise up to VIN1 where VIN1 is calculated by: VIN1 = R1*(VREF / R2) + VREF (5) When VIN is high, the output is also high, to make the comparator switch back to it's low state, VIN must equal VREF before VA will again equal VREF. VIN can be calculated by: VIN2 = [VREF (R1+ R2) - VCC R1] / R2 (6) The hysteresis of this circuit is the difference between VIN1 and VIN2. Delta VIN = VCC R1 / R2 (7) 10 Submit Documentation Feedback Copyright © 2000–2013, Texas Instruments Incorporated Product Folder Links: LMV7235 LMV7239 |
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