130-28176 Parallax Inc, 130-28176 Datasheet - Page 91
130-28176
Manufacturer Part Number
130-28176
Description
KIT PARTS PROCESS CONTROL
Manufacturer
Parallax Inc
Specifications of 130-28176
Accessory Type
Education Kit
Product
Microcontroller Accessories
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
For Use With/related Products
Board of Education Full Kit
Lead Free Status / RoHS Status
Lead free / RoHS Compliant, Contains lead / RoHS non-compliant
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Challenge 3-4 Solution
Challenge 3-5 Solution
1. A higher value of R
2. I
I
Maximum continuous is 200 mA, so OK.
P
Maximum is 625 mW so heat sinking is required.
Lower I
linear region in going from saturation to cutoff.
P
Load line would go to 0.047 on Y-axis to 5 V (cutoff) on X-axis.
SAT
SAT
Q1 MAX
Q1 MAX
= (40 V− 0.3 V)/500Ω = 79.4 mA
= (Vdd − 0.3)/R
= ½ I
B
= ½ I
is required, therefore less in change of V
SAT
SAT
x ½ V
x ½ V
C
C
is desirable based on the response to the input (sensitivity).
= 4.7 V/100 kΩ = 0.047 mA
dd
dd
= (0.5)(79.4 mA) x (0.5)(40 V) = 794 mW
= (0.5)(0.047 mA) x (0.5)(5 V) = .1175 mW
IN
and shorter time spent in
Figure 3-26
Active-Low
Pushbutton Solution
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