HIP4086 driver malfunctioning?
DougInAmbler
Posts: 4
I have a breadboard project using an HIP4086AP driver to drive 6 MOSFETs in what I think is a standard configuration.
Problem: the AHO, BHO, CHO outputs toggle between 7 and 10 volts, no other values.
That is, when xLI = 0, xHO = 7.2, and when xLI = 12, xHO = 10.0
The ALO, BLO, CLO outputs toggle between nominal 0 and 12V as expected, according to the input signals.
Of course this began blowing up MOSFETS by shoot-through.
I have disconnected anything from the the HIP outputs, checked for shorts.
I have replaced the HIP4086 at least four times, all show the same anomaly at the high outputs.
The HIP is pushed into a Digikey breadboard for prototyping. I have checked all the relevant holes and rows for shorts or any cross-connection.
I have tried permutations with the inputs, leaving xHI unconnected, grounded, or connected to xLI, result is same 7 or 10V at xHO
I have RDEL at pin 7 = 86k, to avoid shootthrough
I have tried pulling CHO to ground via 26k resistor, CHO continues to be at 7 or 10V always
My tube of about 12 HIP4086 replacements is about 15 years old, if that is relevant.
Is there any history of this problem?
Problem: the AHO, BHO, CHO outputs toggle between 7 and 10 volts, no other values.
That is, when xLI = 0, xHO = 7.2, and when xLI = 12, xHO = 10.0
The ALO, BLO, CLO outputs toggle between nominal 0 and 12V as expected, according to the input signals.
Of course this began blowing up MOSFETS by shoot-through.
I have disconnected anything from the the HIP outputs, checked for shorts.
I have replaced the HIP4086 at least four times, all show the same anomaly at the high outputs.
The HIP is pushed into a Digikey breadboard for prototyping. I have checked all the relevant holes and rows for shorts or any cross-connection.
I have tried permutations with the inputs, leaving xHI unconnected, grounded, or connected to xLI, result is same 7 or 10V at xHO
I have RDEL at pin 7 = 86k, to avoid shootthrough
I have tried pulling CHO to ground via 26k resistor, CHO continues to be at 7 or 10V always
My tube of about 12 HIP4086 replacements is about 15 years old, if that is relevant.
Is there any history of this problem?
Comments
If this is out of place you may remove it.
I cannot use a Prop1.
My HIP4086 chips defy the Truth Table. Maybe they are all bad.
It was a long shot question, in case anyone had seen exactly my problem.
In testing HIP4086 in isolation I left AHS, BHS, CHS unconnected.
These became floating inputs, causing AHO, BHO, CHO to toggle between 7V and 10V, instead of 0V and 12V as expected.
Case closed.