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circuit_design:uebung_2.1.2 [2022/11/19 05:01]
mexleadmin [Bearbeiten - Panel] 		circuit_design:uebung_2.1.2 [2023/03/27 14:28]
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 <panel type="info" title="Exercise 2.1.2 Calculating a series resistor for a diode"> <WRAP group><WRAP column 2%>{{fa>pencil?32}}</WRAP><WRAP column 92%> <panel type="info" title="Exercise 2.1.2 Calculating a series resistor for a diode"> <WRAP group><WRAP column 2%>{{fa>pencil?32}}</WRAP><WRAP column 92%>
-You want to drive a red light-emitting diode on a voltage source of $U_s = 5.0 V$ with a current of $I_D = 20 mA$. On the Internet, you have found a voltage drop of $U_D = 2.3 V$ for red LEDs. Now you want to know which resistor from the E12 series (available to you) is the correct one.+You want to drive a red light-emitting diode on a voltage source of $U_{\rm s} = 5.0 ~\rm V$ with a current of $I_{\rm D} = 20 ~\rm mA$.  
 +On the web, you have found a voltage drop of $U_{\rm D} = 2.3 ~\rm V$ for red LEDs. Now you want to know which resistor from the E12 series (available to you) is the correct one.
  
-  - Draw the circuit of the LED with series resistor and plot the voltages.  +  - Draw the circuit of the LED with a series resistor and plot the voltages.  
-  - What must be the value of the series resistor $R_V$ to give the voltage drop $U_S$ above?  +  - What must be the value of the series resistor $R_\rm V$ to give the voltage drop $U_\rm S$ above?  
-  - In the red LED datasheet {{elektronische_schaltungstechnik:tlur640.pdf|TLUR6400}}, find the relationship between forward voltage and forward current. What voltage drop $U_D$ can be determined from this for $I_D = 20 mA$ and what is the correct series resistance? <WRAP onlyprint> \\ \\ </WRAP>+  - In the red LED datasheet {{elektronische_schaltungstechnik:tlur640.pdf|TLUR6400}}, find the relationship between forward voltage and forward current. What voltage drop $U_\rm D$ can be determined from this for $I_{\rm D} = 20 ~\rm mA$ and what is the correct series resistance? <WRAP onlyprint> \\ \\ </WRAP>
   - Briefly compare the different results considering the [[https://en.wikipedia.org/wiki/E_series_of_preferred_numbers#Lists|E12 series]]. <WRAP onlyprint> \\ \\  </WRAP>   - Briefly compare the different results considering the [[https://en.wikipedia.org/wiki/E_series_of_preferred_numbers#Lists|E12 series]]. <WRAP onlyprint> \\ \\  </WRAP>