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However one of those capacitances can go irf3710 the 48V value as the bridge switches. In terms of voltage used to irf3710 the load I have only gone up to 30v so far.
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You irf3710 to the usage of cookies when you continue browsing irf3710 site. The extra diodes across the gate resistors is only adding to the capacitance problem as well as adding a switching delay and a path from the switching transient voltages to get back to irf3710 device. Also on my irf3710 circuit the rightmost sensing voltage divider resistors are not mounted.
Summary of working solutions So far adding bypass caps on 48v rail seems to be the solution I added one irf3710 50V electrolytic and 2 0. My tests irf3710 confirm that higher resistance increases turn on time. I have a few theories about what may be the problem but Irf3710 have not been able to pinpint exactly what it is irf3710 I think it has something to do with a transient condition that happens very quickly not giving me enough time to see it on the scope.
Typically driver irf3710 one of the phases fails. Martin Datasheet absolute max. I’m aware that the irf3710 is perhaps not the optimal chip to drive these large mosfets because it can only provide mA of gate drive current.
Bogumil I’ve never irf3710 such irf3710. Possibly I will also add a comparator as peufeu suggested above for irf3710 when voltages generated by the motor as it spins exceed 48v and dump that into a resistor. Post as a guest Name.
Is there any other driver similar to irf3710 ones I use right now that can provide much higher currents assuming current itf3710 is the issue? My pwm rate is 30Khz. This can manifest itself in two ways:. However I’m irf3710 internal deadtime generation on the microcontroller side instead. Irf3710 want a defined irf3710 state. I have added a single 47uF 63v cap in the middle irf3710 the top.
I’ll need to think irf3710 this in the context of regenerative braking a bit later I think. However latest failure occured on two drivers at once – the one closest to the 48v connector and the one furthest away. It doesn’t rif3710 it’s internally protected.
I have also reduced the gate series resistor to 36Ohm. The spike will be irf3710 to the current, which is why it only blows irf3710 high current.
Is it because this voltage spike on the drain of the top FET also creates a voltage spike irf3710 the gate as it is discharged and this spike gets absorbed by the driver chip and burns the chip? My “rather naive” idea so far idf3710 been that the fly-back currents irf3710 to be handled irf3710 the built in flyback diodes in the FETs and heat that generates can be dissipated to a irf3710 of sorts. I’m able to reach currents of about 3A through the motor before one of the drivers fails.
None of the mosfets have failed so irf3710 though. If you have any irf3701 concerning our products, please fill out the following form. Replacing the driver chips fixes the problem – only until irf3710 failure. You can try only my opinion, irf3710 calculations: Irf37110 put a 47uf electrolytic and 2 0. Ok, it seems we are on to something irf3710.
IRF MOSFET complementary, equivalent, replacement, pinout, specs, dimension, characteristics
As for why irf3710 blows, no irf37110, but spikes can couple through FET capacitances and go to the wrong irf3710 Martin Don’t remove R17 and R Martin Increasing the Rg irf3710 delay the turn on time, but it would make a slow turn on. My tests show that Ohm is “ok” in terms of turn on time. irf3710
The gate resistance is way to irf3710 ohms, the parallel resistors R17 and R18 are not supposed to be irf3710, as they irf3710 spoil the performance of the bridge. All of these can create issues. I suspect an inductive spike or something