tiwari.sachin
Full Member level 6
Or should it be anode to ground and cathode to gate
GND ---|>---- Gate
I am now using D18 at 27V so the cutoff is at approx 27.6 V
D19 will be for 12V approx
and will still keep voltage divider for gate and will maintain Vgs at less than 10V
Any suggestions with this configuration??
I have been told to consider maximum input voltage at 30V and have the circuit
so the input zener current will be
Considering 30V
The zener current is about (3-0.7V) / 1kΩ + 3v / 470Ω = 2.3mA + 6.4mA = 9mA (Approx).
The zener power dissipated would then be 27V * 9mA = 243mW
I am selecting a zener with power dessipation of 500mW, 80R impadence and 50nA reverse current
GND ---|>---- Gate
I am now using D18 at 27V so the cutoff is at approx 27.6 V
D19 will be for 12V approx
and will still keep voltage divider for gate and will maintain Vgs at less than 10V
Any suggestions with this configuration??
I have been told to consider maximum input voltage at 30V and have the circuit
so the input zener current will be
Considering 30V
The zener current is about (3-0.7V) / 1kΩ + 3v / 470Ω = 2.3mA + 6.4mA = 9mA (Approx).
The zener power dissipated would then be 27V * 9mA = 243mW
I am selecting a zener with power dessipation of 500mW, 80R impadence and 50nA reverse current