Hi all. I am fairly new to calculating resistor values. I'm trying to
calculate the value required to drive the base of a BCV26 transistor from
5v. The BCV26 will be powering a relay drawing 150mA at 12v
This is the rule of formula I'm referring to from an example at
IB = IC / hFE = 1 A / 1000 = 0.001 A
RB = (VPORT VBE) / IB = (4.2 1.4) / 0.001 = 2800 Ohm, use 2K7 Ohm
P = (VPORT VBE) x IB = (4.2 1.4) x 0.001 = 0.0028 watt, use 0.25 Watt
Here are specs of the BCV26
hFE IC = 1.0 mA, VCE = 5.0 V =4,000
IC = 10 mA, VCE = 5.0 V =10,000
IC = 100 mA, VCE = 5.0 V =20,000
This might be a bit "left-field" for this forum but any help or referal to
a good tutorial would be appreciated.
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