122-28176 Parallax Inc, 122-28176 Datasheet - Page 82

• 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

The common-collector is slightly more difficult to analyze, and we will only briefly
discuss it. In the common-emitter the base current is calculated through:
The collector current is determined from this value using h
In the common-collector, what determines the base current? Both R
from Vss to V
R
perspective, R
Reducing the value of R
to drive the transistor into saturation current.
configuration. Assuming h
With a V
Challenge 3-6: Decreasing R
If R
into saturation?
E
lies on the emitter side, so the effects of h
E
is decreases to 100 Ω, will a 5 V Vin and R
I
I
I
I
I
I
I
I
I
B
C
B
B
B
C
SAT
SAT
of 5 V and no R
= (V
= I
= (V
= (V
= (5 V− 0.7)/((100)(1 kΩ) + 0) = .043 mA
= I
= (Vdd − 0.3)/R
= (5 V− 0.3 V)/ 1 kΩ = 4.7 mA
B
B
E
I
, so a quick assumption would be R
I
h
I
I
h
is not 1 kΩ for this circuit but h
−0.7)/R
− 0.7)/( h
FE
− 0.7 V)/(R
FE
= 4.3 mA
B
B
to zero with a Vin of 5 V there may be insufficient base current
FE
B
FE
, I
E
R
E
C
= 100:
h
E
is almost at I
FE
+ R
E
in the Common-Collector Configuration
+ R
B
)
B
)
SAT
, but not quite.
FE
FE
B
x R
B
of 47 kΩ be able to drive the transistor
must be considered. From the base's
I
+ R
SAT
E
.
E
. But this is not correct because
is defined by Vdd/R
FE
.
B
and R
E
are in series
E
in this