Speakerguy
Active Member
Two weeks ago or so I posted about some problems I was having with the HIP4082. It was a 'well duh' type problem as someone eventually pointed out. In trying to fix it, I had components blow up on me even though the HIP was supposed to have shoot-through protection. I'm not 100% sure it was shoot through though. One low side FET and the two diodes for it (one Schottky, one TVS zener) were all blown. Could have been overvoltage, but they all were rated to 40V and the TVS clamps at 27V. I had the drive signals to the HIP4082 high side FET's both set permanently 'high' and was modulating the low side FETs. This is shown in the HIP schematic as the typical full bridge implementation b/c the HIP is supposed to prevent shoot through regardless of the high side inputs being 'high' all the time. In my case, however, stuff definitely blew up.
ANYWAY, I finally got it going by running the PIC 18F4550 Enhanced CCP module in half bridge mode and cutting traces / jumpering the two drive signals as appropriate to the four control pins on the HIP4082. Works like a charm! My 12V 5A gearmotor is successfully running off my 24V supply in full bridge mode. The all-SMT power board (DPAK mosfets and SMC diodes) get slightly warm at full speed but that's it.
I'll take pics later, but I'm glad it's finally working.
ETA: For the record, a 12V/5A gearmotor that turns at 60RPM has a LOT of torque.
ANYWAY, I finally got it going by running the PIC 18F4550 Enhanced CCP module in half bridge mode and cutting traces / jumpering the two drive signals as appropriate to the four control pins on the HIP4082. Works like a charm! My 12V 5A gearmotor is successfully running off my 24V supply in full bridge mode. The all-SMT power board (DPAK mosfets and SMC diodes) get slightly warm at full speed but that's it.
I'll take pics later, but I'm glad it's finally working.
ETA: For the record, a 12V/5A gearmotor that turns at 60RPM has a LOT of torque.
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