122-28176 Parallax Inc, 122-28176 Datasheet - Page 91

• Manufacturer Part Number: 122-28176
• Description: GUIDE STUDENT PROCESS CONTROL
• Manufacturer: Parallax Inc

Specifications of 122-28176

• Accessory Type: Manual
• Product: Microcontroller Accessories
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• For Use With/related Products: Propeller Education (PE) Kit
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant, Contains lead / RoHS non-compliant

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