Hi Jeffrey,
I have reported TIDA-00778 design guide (Equation 12,13) conflict with UCC27714 datasheet application section equation for selecting Cboot RC time constant. It seems TIDA-00778 equation Cboot jumps from 191n answer and designer then selecting 1000n…
HS is connected to ground 520k in our controller and in TIDA-00778 by monitoring phase FB voltages via ADC channels. We don't mind 15v on HS but do mind HO staying high when EN has disabled HO or HI is low! So it would seem if HO is high when EN is low…
Hi John,
Might I PM the whole schematic PDF so you can see the VDD supply too?
I was able to tweak pre-charge pulse width, produce 105ns falling edge pulse aimed toward ground. The HI drives are kept false and all three phases LO pulsed 105ns. The original…
Part Number: UCC27714 Other Parts Discussed in Thread: UCC2895 , , TIDA-00778
How possible is it that UCC HO/LO Totem poles reversed design require inverted PWM on HI/LI?
We used same application firmware with top gate driver over past years and not had su…
Hi Don,
It seems Derek gives good example why TI bench has not produced PDF of workarounds for high VDS peaks. If the bench considers the time period after Miller 2 the NFET Qrr recovery that would explain a lot. It only recently became very clear the…
Part Number: INA240 Other Parts Discussed in Thread: INA303 , OPA835 , TIDA-00778 , TIDA-00913 Logically table below could be interpreted as a range A1-A4 or only that A1 and A4 device have 9.6us, 9.8us respectively 0.5% of final value.
Then what is the settling…
So you then agree the analog comparator is indeed a peripheral as datasheet suggests. That was the other point of question as to why the input pins C0,C1,C2(+/-) were exempt from AFSEL bits setting HW contrary to it being a peripheral and not directly…
Part Number: MOTORWARE Other Parts Discussed in Thread: TIDA-00778 , BOOSTXL-DRV8301 , Hi,
We have a 20 pole Surface Mount Permanent Magnet motor that we are trying to drive with a custom motor controller design based on the TIDA-00778 reference design. …
BTW: TIDA-00778 2KW IGBT motor controller use 0.047uf at C1. Tested EMF circuit of DRV8305 where C1 0.1uf produced sine wave roll off but motor sounds like can O nuts and runs even worse. The difference is greater capacitance reduces the higher pulse…
Hi Don, Other vendors gate driver also had a little of same undershoot along ground. So far 80ns dead time seems to work for 24v but a single HO output was quickly compromised initial 80vdc testing. First few pulses and one HO output was compromised…
