Delay matching in IR2xxx low and high side gate drivers - diyAudio
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Old 8th June 2007, 06:13 PM   #1
Eva is offline Eva  Spain
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Default Delay matching in IR2xxx low and high side gate drivers

I have been analyzing the delay matching between channels in the following IR gate drivers. Test conditions are 22C, no load except 70pf (or so) from oscilloscope probes, Vcc=12V with 220nF decoupling applied to all three sections of the IC and both inputs driven in parallel from a fast square wave generator.

- IR2112: I have 10 pieces of these, all from the same batch. The high side output turns on 5ns later than the low side, and it turns off 30ns later. Those delays are consistent among all the devices tested.

- IR2010: I have 9 pieces of these, all from the same batch. Both outputs turn on almost at the same time, but turn off of the high side is delayed 30ns with respect to the low side. The delay is consistent among all the devices tested. I have also noticed that these delays drift a lot with temperature changes.

- IR2113: I have 9 pieces of these, 4 from one batch with white letters and another 5 from other batch with yellowish letters. The low side seems to be delayed by 5ns with respect to the high side, both at turn on and at turn off. The delay is very consistent among all the devices from the two batches.
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Old 8th June 2007, 06:56 PM   #2
Eva is offline Eva  Spain
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Edit:

IR2113 seem to suffer very little drift with temperature, the delay was almost the same when the chip case was at 60C (due to self heating, measured with IR thermometer).
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Old 8th June 2007, 07:19 PM   #3
Hartono is offline Hartono  Indonesia
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Hi Eva,

very nice testing, thanks for sharing

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Old 9th June 2007, 02:11 PM   #4
BWRX is offline BWRX  United States
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Hi Eva.

What switching frequency were your tests performed at?
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Old 9th June 2007, 02:21 PM   #5
luka is offline luka  Slovenia
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Hi

I think she said that at 4MHz if not she will correct me
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Old 9th June 2007, 05:55 PM   #6
Eva is offline Eva  Spain
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Quote:
Originally posted by BWRX
Hi Eva.

What switching frequency were your tests performed at?
I tried 50Khz, 1Mhz, 2Mhz and 4Mhz. The delay figures mentioned were obtained at 50Khz and verified at 1Mhz and 2Mhz but not at 4Mhz, where strange things happen...
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Old 9th June 2007, 06:00 PM   #7
Hartono is offline Hartono  Indonesia
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Hi Eva,

"where strange things happen..."

What happened ?


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Old 9th June 2007, 06:47 PM   #8
Eva is offline Eva  Spain
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At 4Mhz with IR2010 the high side channel is further delayed, particularly as temperature increases. Both turn on and turn off may be delayed by up to 100ns at 60C case temperature with respect to the other channel. This does not happen with IR2113.
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Old 10th June 2007, 09:02 PM   #9
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The data sheet on the IR2010 shows graphs of Tj as a function of frequency and load. Depending on the load Tj, starts to rise above a frequency of 100 KHz. At 4 Mhz I suspect Tj will be high even with light loading.
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