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clear//
//Variables
VO=5.0;VL=5.0;
IL = 20.0 //Load current (in milli-Ampere)
PZmax = 500.0 //Maximum power dissipation in zener (in milli-watt)
VSmin = 9.0 //Minimum source voltage (in volts)
VSmax = 15.0 //Maximum source voltage (in volts)
VZ = 5
IZ =20
//Calculation
IZmax = PZmax / VZ //Maximum zener current (in milli-Ampere)
ISmax = IL + IZ //Maximum input current (in milli-Ampere)
RSmin = (VSmax - VZ)/(IZmax + IL) //Minimum value of regulating resistance (in kilo-ohm)
IZ = (VSmin - VZ)/ RSmin - IL //Minimum value of zener current
//Result
printf("\n Input varies from the normal 12 v within the range of +- 3 V.")
printf("\n Zener current vary from %0.3f mA to %0.3f mA.",IZ,IZmax)
printf("\n For safety purpose RS should be 220 ohm.")
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