fungus:
JoeN:
I still have problems with the TLC5940.What problems? They seem simple to me...
They seem simple to me also, however... The same problem that several people have had. They burn up. So what I have on my test setup so far is 3 TLCs (48 channels) and 2 8x8 RGB matrices (48 LEDs) and a reasonable IREF resistor selection (1.8K) and it runs for it bit drawing like 600mA with the matricies being powered and then all of the sudden jumping to about 2A and the matricies not being powered - it's just shorting within the TLC chip. I have to cut power then or it will burn up. The TLC controls the anodes and 8 P-channel MOSFETs control the cathodes in this setup with a 1/8 duty cycle. I set all channels to 1/2 power but I have tried lower power and it still screws up. I looked at the waves off the MOSFETs and they look fine. I just can't tell what the hell is going wrong.