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UC3704 датащи(PDF) 4 Page - Texas Instruments |
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UC3704 датащи(HTML) 4 Page - Texas Instruments |
4 / 6 page Output Section The output portion of the UC3704 is basically a second comparator with complimentary, open-collector outputs. This comparator has a built-in, ground-referenced thresh- old implemented with a high-impedance current source and resistor so that it may be easily overridden with an external voltage source if desired. Comp 2’s input tran- sistors are NPN types which require at least 1V of com- mon-mode voltage for accurate operation and should not see a differential input voltage greater than 6V. For diagnostic or latching purposes, the output logic is equipped with a Remote Activate and Reset function. These pins have internal pull-ups and are only active when pulled low below a threshold of approximately 1V. A low signal at the Remote Activate Pin causes the outputs to change state in exactly the same manner as if Comp 2’s input is raised above the threshold on Pin 11. If Pin 16 is connected to Pin 14, positive feedback results and the outputs will latch once triggered by Comp 2’s input. Pulling the Reset terminal low overrides the Remote Acti- vate Pin releasing the latch. Reference Buffer This circuit is designed to provide up to 100mA to drive a high current external PNP transistor useful for powering a heater for differential temperature measurements. Care must be taken that power dissipation in Q6 does not cause excessive thermal gradients which will degrade the accuracy of the sensing circuitry. Using a heating element attached to a temperature sen- sitive resistor, RS1, in one leg of the input bridge imple- ments a flow sensor for either gasses or liquids. As long as there is flow, heat from the element is carried away and the sensor voltage remains below threshold. Using an identical sensor, RS2, without a heater to establish this threshold compensates for the ambient temperature of the flow. UC3704 TYPICAL APPLICATION FOR MONITORING LIQUID OR GAS FLOW UNITRODE INTEGRATED CIRCUITS 7 CONTINENTAL BLVD. •• MERRIMACK, NH 03054 TEL. (603) 424-2410 •• FAX (603) 424-3460 APPLICATIONS INFORMATION (cont.) 4 |
Аналогичный номер детали - UC3704 |
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Аналогичное описание - UC3704 |
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