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Old 29th May 2010, 02:37 AM   #1
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Default IR2110 Query

IR2110 Query
With the circuit implemented to drive the DC motor using the two IR2110 IC's constructed in a full bridge form,
we are able to drive the DC Motor with the deadtime generated at the LIN and HIN inputs. But the output signals at LO and
HO, with the CRO probes at the input of the Gate resisitors (22Ohms) the pulses we obtained are as shown in the attached files. Even though the dead time is generated, and even though the lower MOSFET is turned off, it wont turn off till the Upper MOSFET gets turned on, resulting in a very large spike at the current sense resistor due to the turn on of both the mosfets at a fraction of time. A diode resistor in parallel are also connected at the Gate of MOSFETs. I think , the MOSFETs we are using (IRF540N) are able to withstand this large current, so as per now we are not facing the short circuit problem. But at times, may be due to this reason our entire Full bridge section is getting burst and fail.
Please suggest me how to solve these large current spikes, and how to obtain a noisy free PWM waveforms at LO and HO.
PWM Frequency : 24KHz
MOSFET : IRF540N

Please go throuugh the attached circuit and output waveforms and acknowledge me at the earlier.
Attached Files
File Type: zip Mail_IR2110.zip (23.3 KB, 160 views)
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Old 29th May 2010, 03:14 AM   #2
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ADD free wheeling diodes across mosfets,the stray inductance in drain & source generate spikes and these has to be bypassed to supply..
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Old 29th May 2010, 03:22 AM   #3
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Click the image to open in full size.

GREEN: add resistor between gate & source..and green tracks in drain & source that contributes stray inductance.
RED: FAST recovery schottky diodes.
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Old 29th May 2010, 06:55 AM   #4
Pafi is offline Pafi  Hungary
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RAKhan!

I don't see any sign of real cross-conduction. Gate signals are OK. The spikes you see on current sense resistor (or at least most part of them) come from its inductance and parasitic capacitances (of MOSFETs and the motor).

A known error of IR2110 (and other high side gate drivers of IR) can be occured at very short HI pulses. If it's too short (somewhere under 50 ns), the high side can stuck at ON state. Maybe this can be a reason of failure.

Last edited by Pafi; 29th May 2010 at 07:02 AM.
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Old 29th May 2010, 07:02 AM   #5
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remove the LOAD & measure the no load current ?
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Old 29th May 2010, 11:46 AM   #6
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Default Ir2110

Thank u so much for ur replies, i checked with the fast recovery diodes hfa25tb60 across the mosfets, and also then without load and then without connecting motor but of no change. You told to place the resistors , can u please suggest what should be the valueof resistors.
Please help me.

Thank U.
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Old 29th May 2010, 04:40 PM   #7
jej is offline jej  France
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Hi RAKhan
I don't understand your gate signal! Your probe is by 1 or by 10? You can't correctly drive a IRF540 with only 4v. (It's not a logic Mosfet) Your gate resistor is also to high 15 ohms is a good value.
What is the value of your bootstrap voltage?
To measure the current, the ground of your probe must very short. Some special devices exist with probes for this
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