Is it possible you are confusing this driver format with one that would have oppossing outputs? Sign up or log in Sign up using Google. Typically driver in one of the phases fails. My tests show that Ohm is “ok” in terms of turn on time. Radiation Detection Circuit 1. If I decouple each FET then that would mean the cap would be placed between drain and source of each fet. At first it happened twice on the driver furthers away from 48v connector.

Uploader: Mikashakar
Date Added: 12 October 2012
File Size: 37.59 Mb
Operating Systems: Windows NT/2000/XP/2003/2003/7/8/10 MacOS 10/X
Downloads: 18481
Price: Free* [*Free Regsitration Required]

You can try only my opinion, without calculations: Similar Threads Problem in driving the high side mosfet with L Resonant controller Datasheet says that driver is operational up to V switching voltage.

If 48V is not properly bypassed then of course everything will blow due to voltage spike caused by energy stored in wiring inductance having nowhere to go. I’m able to reach currents of about 3A through the motor before one of the drivers fails. Sign up or log in Sign up using Google. Currently I have not done any other tests besides spinning up the motor three identical circuits are used to drive one phase each. By clicking “Post Your Answer”, you acknowledge that you have read our updated terms of serviceprivacy policy and cookie policyand that your continued use of the website is subject to these policies.


It is meant ir211 be used with a common mosfet load output hence the need for a dead time.

mosfet – IR cross-conduction – Electrical Engineering Stack Exchange

Home Questions Tags Users Unanswered. I have seen schematics using resistors.

However after reading several application notes I will try to find exact ones it seems having these resistors is a good idea as means of protecting the driver – higher R means lower maximum current. High side mosfet driving problem – Ir21011 The circuit works up to a certain current through the mosfet but then the driver mysteriously fails and pulls both mosfets high generating a short circuit on the output. As you can see from the functional block diagram, the gate drive outputs HO and LO are actively driven both high and low so the 1K ohm resistor is not needed.

One non-inverted and one mozfet.

For a frequency as low as Hz the capacitor must be much larger. At first it happened twice on the driver furthers away from 48v connector. You want a defined startup state. IR cross-conduction Ask Question.

MOSFET and IR2101 Driver

Martin Don’t remove R17 and Mosret Now everything seems to be fine. High side mosfet driving problem – IR Maybe you missed the point but he actually designed msfet 47uF capacitor in parallel with the nF one though it was soldered in a wrong way by a technician. What could I do to force it to saturate? Should I maybe use a larger resistor in series with the gate to protect the driver against possible reverse currents?


Originally Posted by FvM.

The short happens after the driver chip fails because it then drives both gates high really bad way to fail. The motor spins up to a certain point, then as I increase the motor speed current increases as well one or more of the drivers fail.

I have added a single 47uF 63v cap in the middle at the top. The only bootstrap capacitor in the circuit is the smaller one nFas FvM has suggested.

H-Bridge DC motor driver circuit with IR2101

When the high side FET is on, the voltage drop across it drain-source voltage is about 2. Hopefully you have measured the turn on and turn off times and are using at least double that value. Last edited by Bianconero; 16th February at The diodes are for delaying turn on and making sure turn off is very fast.

Also on my test circuit the rightmost sensing voltage divider resistors misfet not mounted.