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Old 25th December 2008, 04:58 PM   #1
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Default IR2110 question (help me)

Hi friends

Help me with this question:

How many MOSFETs/IGBTs the IR2110 can drive in HALF-BRIDGE?

Thank you very much.

Sandro
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Old 25th December 2008, 06:10 PM   #2
Eva is offline Eva  Spain
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The first limiting factor is chip heating. The second one is switching times.

Do some research on MOSFET/IGBT gate charge and the calculations related.

The amount of heat produced inside the IR2110 will depend on supply voltage, operating frequency and total gate charge. Switching times are directly related to gate charge too.

The datasheet contains plots of chip temperature increase versus operating frequency for various reference MOSFET models.
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Old 28th December 2008, 08:45 AM   #3
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Default IR2110

-----


IR 2110 Usually will be able to drive 4 IGBTs, or 4 Mosfets Easily.


BUT your design is very important, frequency, voltage.

This chip is being used by a Known companies around the world to drive there SMPS. with long term operation and trouble free.
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Old 29th December 2008, 09:05 PM   #4
Bakmeel is offline Bakmeel  Netherlands
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As an alternative, have a look at some of the Micrel devices. They are usually not as fast as the IR parts, but some models can deliver a quite high gate current. That would allow you to drive some more parallel fets.
Micrel Gate Drivers
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Old 30th December 2008, 07:33 PM   #5
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Ok

I 'll look that gate drivers.

Thank you
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Old 11th January 2009, 11:52 PM   #6
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Default still about IR2110

Hi Dears

I use SG3525 and IR2110 in my SMPS. About the shutdown control, how I do? Do I need use the IR2110 shutdown pin and the same of SG3525 together? Or only one this is the best way?

Thanks Eva and all.

Sandro
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Old 12th January 2009, 12:11 PM   #7
Bakmeel is offline Bakmeel  Netherlands
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You don't need to use both necessarily.

Using the IR2110 shutdown will give you an almost immediate response, and is very good for instantaneous over-current protections for example. However, if you release the shutdown, the IR2110 does not control the switch-on of the converter as a whole.

The SG3525 shutdown may be a bit slower, but just a bit. When the shutdown condition is removed, the SG3525 will come back "more clean" than the IR2110.

Of course, it depends on how you intend to use the shutdown, I recommend you just pull the IR2110 shutdown to ground and only use the SG.
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Old 12th January 2009, 11:22 PM   #8
Eva is offline Eva  Spain
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The inputs of the IR2110 are latched. After the shutdown pin has been pulled high and then low, each output won't turn on again until the input signal has gone low and then high.

This could be described as pulse by pulse shutdown.
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Old 15th January 2009, 09:49 AM   #9
Bakmeel is offline Bakmeel  Netherlands
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The tricky bit is the risk of an "intermediate" switch-on of the High side driver. If you have been unable to switch the low side on first, you may end up with insufficient energy in the bootstrap supply. The high side driver is then not able to achieve full saturation in the mosfet.

My application was a synchronous rectified boost, and the intermediate failure led to a reversed current in the switching node, killing the two mosfets and the gate driver. The solution was to force the driver to switch on the low side first, allowing the bootstrap to charge up before switching the high side.
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Old 24th January 2009, 10:31 AM   #10
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Default SMPS picture

Hi SMPS builders

This is my SMPS. 13.8V, 75A, Only 0.1V of voltage fall.

Thanks for all.

Sandro.
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