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CS209A датащи(PDF) 5 Page - ON Semiconductor

номер детали CS209A
подробное описание детали  Proximity Detector
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производитель  ONSEMI [ON Semiconductor]
домашняя страница  http://www.onsemi.com
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CS209A датащи(HTML) 5 Page - ON Semiconductor

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CS209A
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5
Figure 5. Test and Application Diagram
RL
1.0 kΩ
NORMALLY
HI
RL
1.0 kΩ
NORMALLY
LO
VCC
OUT1
OUT2
L: Core: Siemens B65531−D−R−33
52 Turns, 6 × 44 AWG, Litz Unserved
Single Polyurethane
DEMOD
CDEMOD
2200 pF
GND
TANK
4300 pF
L
20 kΩ
CS209A
OSC
RF
Figure 6. Capacitor Ripple
VTANK
VDEMOD
Figure 7. Output Pulse for an 8 Tooth Gear
VOUT1
VDEMOD
The feedback potentiometer connected between OSC and
RF is adjusted to achieve a certain detection distance range.
The larger the resistance the greater the trip−point distance.
(See Figure 4.) Note that this is a plot representative of one
particular set−up since detection distance is dependent on
the Q of the tank. Note also from the graph that the capacitor
voltage corresponding to the greatest detection distance has
a higher residual voltage when the metal object is well
outside the trip point. Higher values of feedback resistance
for the same inductor Q will therefore eventually result in a
latched−ON condition because the residual voltage will be
higher than the comparator’s thresholds.
As an example of how to set the detection range, place the
metal object at the maximum distance from the inductor the
circuit is required to detect, assuming of course the Q of the
tank is high enough to allow the object to be within the IC’s
detection range. Then adjust the potentiometer to obtain a
lower resistance while observing one of the CS209A outputs
return to its normal state. (See Figure 5.) Readjust the
potentiometer slowly toward a higher resistance until the
outputs have switched to their tripped condition. Remove
the metal and confirm that the outputs switch back to their
normal state. Typically the maximum distance range the
circuit is capable of detecting is around 0.3 inch. The higher
the Q, the higher the detection distance.


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Аналогичное описание - CS209A

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