Using the SG3525 in single-ended mode. Everything seems fine, but the longer the output is on, the more power supply current is demanded, and the IC gets hot pretty quick. The gate driver and IGBT is totally fine, the issue is excessive power supply current drawn by the SG3525.
Is this a dead time issue? I thought this would only be a problem in push pull, and I could set the RD to 0 ohms in single ended operation.
Is this a dead time issue? I thought this would only be a problem in push pull, and I could set the RD to 0 ohms in single ended operation.
You have connected pin 13 directly to Vcc; for SE operation, it should serves as an output, with 11 and 14 grounded.
I imagine that with RD=0, some conflict occurs due to cross-conduction, and this causes the excessive heating and current draw.
Either you follow the datasheet philosophy, or you limit the current through 13, or you make RD non-zero to avoid the conflict
I imagine that with RD=0, some conflict occurs due to cross-conduction, and this causes the excessive heating and current draw.
Either you follow the datasheet philosophy, or you limit the current through 13, or you make RD non-zero to avoid the conflict
Well that's annoying. I perceived the outputs as floating, but they are not.
v2.0 attached, I expect this would resolve it?
Now, after pondering, I am not convinced it is a dead time problem, but the floating output error. The datasheet permits 0 ohm RD, but I have placed 22 ohm since I don't need 99% duty cycle.
v2.0 attached, I expect this would resolve it?
Now, after pondering, I am not convinced it is a dead time problem, but the floating output error. The datasheet permits 0 ohm RD, but I have placed 22 ohm since I don't need 99% duty cycle.