I am trying to calculate the Power Dissipation of an SSR #CPC1511. I have been over many possibilities for this calculation and it still remains an electronic mystery. I am feeding 12VDC 3A supply into both a voltage generator circuit and a 555 timer. The generator is set to deliver 100VDC. Using a 750 Ohm, 30W resistor, I should get .133A. The 555 is constructed for 8Hz. I have read that you calculate dissipation for just the SSR which has a total dissipation of 1436mW. Using P=IxIxR with I=.133A and R=2.8 Ohms ("on" resistance per data sheet), P=.05W = 50mW. They indicate that you need to derate dissipation. 85*C-25*C=60*C. 60*C x 14.3mW/*C=858mW. Why do they advertise dissipation at 1436mW when actually it is 858mW ? Does this mean that because the 50mW is well within the range of 858mW, this SSR will not melt down with 100VDC/133mA ?
Others have suggested you have to take into consideration the pulse rate of the 555, and the components down stream of the SSR.
Any help would be greatly appreciated.
Others have suggested you have to take into consideration the pulse rate of the 555, and the components down stream of the SSR.
Any help would be greatly appreciated.
