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UC3704 데이터시트(PDF) 4 Page - Texas Instruments

부품명 UC3704
상세설명  Bridge Transducer Switch
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UC3704 데이터시트(HTML) 4 Page - Texas Instruments

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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


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