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Old 24th June 2008, 01:49 AM   #1
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Unhappy Alternative for IR2xxx series

Hello! I have nothing to say that my English is not good.

I have some small doubts, always caught my attention Class D amplifiers, however, the few diagrams eh found on the Internet that require the IC IR2110, IR2111, and so are my doubts: Is there any alternative to this IC? Will there be a way to make a more simple design with common components?

I thank in advance all the help I can give
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Old 24th June 2008, 02:09 AM   #2
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A discrete high side driver would be more complex. IR2xxx actually result in simple drive circuits with very low part count.
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Old 24th June 2008, 03:17 AM   #3
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Every major semiconductor has their own high/low side driver. Like UCC27200 from TI.
If you want to skip these driver IC's, make class D with common source Pch/Nch mosfet, you don't need these drivers.
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Old 24th June 2008, 06:02 AM   #4
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There are no high-performance P-channel MOSFET with Vds ratings above 100V, and the ones rated at 100V or less exhibit too high Rds-on and charges/capacitances in comparison with N-channel devices.

You get increased performance and efficiency in return for the complexity of high side drive.
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Old 24th June 2008, 11:22 AM   #5
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I'm blowing high/low mosfet driver like popcorn here. They seems so fragile. What's the secret to work with these IC's during development/experiment stage?
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Old 24th June 2008, 03:21 PM   #6
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I have used IR2110 with success, not even a single failure with mosfet upto 230nC of Qg.

For higher voltage and Qg mosfets, TC4420 + 6N137 is very good
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Old 24th June 2008, 03:41 PM   #7
Eva is offline Eva  Spain
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Quote:
Originally posted by lumanauw
I'm blowing high/low mosfet driver like popcorn here. They seems so fragile. What's the secret to work with these IC's during development/experiment stage?
Could you show us the PCB layout and the schematic of the circuit that is so prone to blowing IR2xxx?
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Old 25th June 2008, 03:54 AM   #8
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I'm not using IRxxxx, but UCC27200. Here's the PCB layout, I have to draw the schematic later.
Attached Images
File Type: gif layout.gif (21.4 KB, 1207 views)
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Old 25th June 2008, 07:03 AM   #9
Eva is offline Eva  Spain
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And where is the ground plane?

The bootstrap capacitor is by far too small for audio class-D

The low-side current sense resistor is in the gate drive loop and in the HB/HS clamping loop

You clearly have some good keys for success

I place all my gate driver ICs and modulators in daughter boards and I use continous ground planes. I would never sense the current in that way, too. All this is for good reasons...

BTW: My methods may seem crazy, but I've just measured over 94% efficiency on a two-stage 120V 60Hz sinewave inverter at 2000W output. It uses IR2113 and I have not blew a single one during the whole development.
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Old 25th June 2008, 07:24 AM   #10
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Hi, EVA,

Why is when I blow the output mosfet, the driver always broken too? In experimental stage, how to preserve the UCC27200 whenever the output mosfet is blown away?

Quote:
The low-side current sense resistor is in the gate drive loop and in the HB/HS clamping loop
Do you mean the Vss for the UCC27200 should be taken after the current sensing resistor?
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