Hi FvM,
This is the spice model I am using
.subckt MCR22-8 anode gate cathode
* Min and Max parameters
X1 anode gate cathode Scr params:
+ Vdrm=600v Vrrm=600v Ih=2ma Vtm=1.2v Itm=1
+ dVdt=25e6 Igt=0.2ma Vgt=.8v Ton=1.2u Toff=40u
+ Idrm=10u
* 90-5-18 Motorola DL137, Rev 2, 3/89
.ends
How did you calculated the figure of 750 ohms? Please help me understand.
I read this formula in a book and was myself surprised to find that how come gate resistance is not included. I checked the datasheet and found the value RGK = 1000 Ohms mentioned somewhere but then I am not understanding how spice is calculating level of the gate current.
-Hemanshu