I was reading about SCRs and I'm trying to simulate 2N5060 SCR but having some issues when I plot the currents and voltages:
First by looking at the datasheet, I set the R4 to keep the gate current a bit less than 200uA.
For V2 I set the on time for the 5V gate pulse as 50u and 100us period.
I set a load which does not exceed 0.8A rated.
And here is the current through R1:
and here is the zoomed view:
And here is the plot of the voltage at the gate node:
Why is the load current has so many spikes?(it even gets worse with the shorter pulse ON times)
Is the gate voltage normal? It doesn't go to zero volt even I put a resistor between the gate and the cathode.
Why doesn't this SCR rectify the current? It passes the current both way, see my first plot.
I might be doing something fundamentally wrong but couldn't figure out the source of the issue.
The gate current:
I increased the gate current as suggested and it still doesn't work.
And here is the SPICE model:
********** *SYM=SCR *SRC=2N5064;2N5064;SCRs;TECCOR; 200V 0.8A .SUBCKT 2N5064 1 2 3 * TERMINALS: A G K QP 6 4 1 POUT OFF QN 4 6 5 NOUT OFF RF 6 4 400K RR 1 4 267K RGK 6 5 80 RG 2 6 9.09 RK 3 5 0.112 DF 6 4 ZF DR 1 4 ZR DGK 6 5 ZGK .MODEL ZF D (IS=3.2E-16 IBV=100U BV=200) .MODEL ZR D (IS=3.2E-16 IBV=100U BV=200) .MODEL ZGK D (IS=3.2E-16 IBV=100U BV=5) .MODEL POUT PNP (IS=320F BF=1 CJE=402P TF=102U) .MODEL NOUT NPN (IS=320F BF=100 RC=0.45 CJE=2.01N CJC=402P TF=3.74U) .ENDS **********