4424 FET DRIVER DOWNLOAD

You can always “deadbug” a resistor across G-S. Yeah, I’m only applying PWM to the lowside FETs, the highside FETs are not modulated so the deadtime og dead-band delay is when the motor should change direction and this can’t be what happens here. That would help prevent blowout from false turn on no matter how it occurred power up, power down, bad dead time setting, any false signal. If you want to use 1 ohm resistors that should be ok too as you can change them later once everything is working. What you could do to see if the PIC output ports are causing the problem is you could look at the outputs with a scope during power up and during power down and see if they do something unwanted, or just look for the spikes at the 0. Deadtime, is that the time between changing motor direction? This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register.

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I haven’t tried anything yet. Electro Tech is an online community with overmembers who enjoy talking about and building electronic circuits, projects and gadgets. But as I wrote, my code does not even change the direction yet, and certainly not on power up. Perhaps you need a better startup sequence. A fuse isnt a bad idea but sometimes they are 4424 fast enough.

Try connecting a 0. It might be difficult to control the power up and power down phases so you might want to see if your application can tolerate those 0. Forums New posts Search forums.

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TSM 4424 CS

Also add some clamp diodes while you are at it to prevent overvoltage spikes when the FETs turn off. In the end, it will be far cheaper and easier than replacing transistors and ICs. My 20A powersupply went into overload and I quickly saw the amp-meter showing 23A and it smelled funny and I quickly disconnected the power again.

Futterama Member Feb 7, I was running the unloaded motor at a frequency and would just change it in my code, so I disconnected the circuit from Vin, did the quick change in code, recompiled, reprogrammed the PIC and connected the Vin again, this took around seconds. I think I would still use a fast diode as the reverse recovery can be kind of slow on the body diodes. Usually the power supply has enough capacitance to absorb the spike. Check as an example, the following driver, it has adjustable deadtime: I even wait to the end of a duty cycle before enabling the output drivers.

This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register. Any idea what went wrong? The body diode will clamp it. That would help prevent blowout from false turn on no matter how it occurred power up, power down, bad dead time setting, any false signal. Deadtime is the very short period one must have between the time a Mosfet is turned off and the time the opposite Mosfet is turned on. The resistors would be there for protection against non recurring cross conduction.

It seems to me that k is fine, the gates should discharge real fast fe power is removed with k pulldown and about pF MOSFET input capacitance. I think the first thing to do is to add a resistor to Vin so the short circuit current is limited, I actually looked for a 10A fuse yesterday, the fuse would be easier to replace 44244 the MOSFETs and drivers, and I’m running low on replacements.

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TCA – Power MOSFET Drivers – Power Management

To participate you need to register. You can always “deadbug” a resistor across G-S. Futterama Member Feb 6, You can do this at startup and while operating normally. If they have a little internal resistance though that helps too.

H-bridge problem, burning out MOSFETs

For example, how much dead time did you build into the program code? You also might want to kill the drives for all four transistors before you actually power down the PIC and the driver chips.

I supose you could just divide get 12 volts down, but that will slow it down a bit so you would need to be careful on reversals. You can then look across each resistor with a scope to see if there are any large spikes which would indicate that the bridge is not being switched properly.

All the FETs have a k pulldown resistor on the gate.