Speakerguy
Active Member
Hey guys,
I am working with an 18F4550 and a HIP4082 full bridge driver. I'm decent with PIC's and I have all four PWM outputs working (have probed with scope).
I cannot seem to get the high side gate drive signals working properly coming out of the HIP4082. The low side signals are very good in either direction, but the high sides look like garbage. I would try to describe them to you but I'm not sure what I'm looking at on the scope really. I think my problem is likely with the bootstrap but I've tried multiple diodes and caps to no avail. I've attached my schematic. Have tried Shottky bootstrap diodes as well as regular S1B diodes and 10, 100, and 1000uF caps for the bootstrap sections. Also multiple frequencies from low <10khz to above 100khz.
If someone could look over my schematic and the data sheet for the HIP4082 to see if I did something stupid, I would really appreciate it. Thanks!
HIP4082
https://www.electro-tech-online.com/custompdfs/2009/04/fn3676.pdf
I am working with an 18F4550 and a HIP4082 full bridge driver. I'm decent with PIC's and I have all four PWM outputs working (have probed with scope).
I cannot seem to get the high side gate drive signals working properly coming out of the HIP4082. The low side signals are very good in either direction, but the high sides look like garbage. I would try to describe them to you but I'm not sure what I'm looking at on the scope really. I think my problem is likely with the bootstrap but I've tried multiple diodes and caps to no avail. I've attached my schematic. Have tried Shottky bootstrap diodes as well as regular S1B diodes and 10, 100, and 1000uF caps for the bootstrap sections. Also multiple frequencies from low <10khz to above 100khz.
If someone could look over my schematic and the data sheet for the HIP4082 to see if I did something stupid, I would really appreciate it. Thanks!
HIP4082
https://www.electro-tech-online.com/custompdfs/2009/04/fn3676.pdf
Attachments
Last edited: