help with gate drivers(IR2110)

maverick_123 · 27th November 2007, 03:37 AM

Hey guys,

Well I'm trying to understand the function of a gate driver using the schematic below. How can I test the output of the gate driver without connecting the mosfets. Also will the circuit work if I just connect +/- 25V to the mosfets and -10V to the gate driver.
forgot to mention that I'am using an IR2110.

I just don't get how it works.

Need help

BWRX · 27th November 2007, 04:35 AM

Quote:

Originally posted by maverick_123
Well I'm trying to understand the function of a gate driver using the schematic below.

Have you tried looking at the datasheet? http://www.irf.com/product-info/data...ata/ir2110.pdf

There's a functional block diagram as well as test circuits shown in there.

fredos · 27th November 2007, 12:13 PM

Disconect feedback loop and put it to ground, short output nod to -VCC to make the hight side working. Mosfet should be unconnected....You will be able to check gate signal...

Or simply unconnect the +\- VCC and measure gate drive!

Fredos

maverick_123 · 27th November 2007, 01:40 PM

Fredo,

If I disconnect +/- VCC to the Mosfets what should I do the the Vs pin of the gate driver.

maverick_123 · 27th November 2007, 01:44 PM

Fredos,

One more thing, I don't have the power supplies that this schmatics has. I'am working with +/-25v and -10v.

I notice their is a 15 volts difference and that what I'am doing for testing purposes.

fredos · 27th November 2007, 02:00 PM

You should leave the aux PSU for mosfet driver, but with no VCC to power mosfet...Then you will be able to take some measurement..

When you do that, short output terminal to ground to avoid false reading due to possible offset on output..

Fredos

maverick_123 · 27th November 2007, 03:22 PM

Fredos,

Ok I've done my research and it seems the typical connection of a gate driver is to apply -VCC to pins SD,VSS, and Com. What does that have to do with it's function. Here is another example of a gate driver connection.

http://rl.pri.ee/electronics/amplifi...ex.html#output

Another thing, I don't have the load connected it to the output of the mosfets. So are you saying not to power the mosfets and apply the -10V to the gate and see the signals out

fernando_g · 4th December 2007, 08:53 PM

I'm just curious......but I have a question.
Unrelated to your original question, but related to your schematic:

Why are you double-buffering the triangle wave?

The keyword here is double.

27th November 2007, 01:44 PM	#5
maverick_123 diyAudio Member Join Date: Sep 2007	IR2110 Fredos, One more thing, I don't have the power supplies that this schmatics has. I'am working with +/-25v and -10v. I notice their is a 15 volts difference and that what I'am doing for testing purposes.

27th November 2007, 03:22 PM	#7
maverick_123 diyAudio Member Join Date: Sep 2007	IR2110 Fredos, Ok I've done my research and it seems the typical connection of a gate driver is to apply -VCC to pins SD,VSS, and Com. What does that have to do with it's function. Here is another example of a gate driver connection. http://rl.pri.ee/electronics/amplifi...ex.html#output Another thing, I don't have the load connected it to the output of the mosfets. So are you saying not to power the mosfets and apply the -10V to the gate and see the signals out

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27th November 2007, 12:13 PM	#3
fredos diyAudio Member Join Date: Mar 2005 Location: Quebec	Disconect feedback loop and put it to ground, short output nod to -VCC to make the hight side working. Mosfet should be unconnected....You will be able to check gate signal... Or simply unconnect the +\- VCC and measure gate drive! Fredos

27th November 2007, 02:00 PM	#6
fredos diyAudio Member Join Date: Mar 2005 Location: Quebec	You should leave the aux PSU for mosfet driver, but with no VCC to power mosfet...Then you will be able to take some measurement.. When you do that, short output terminal to ground to avoid false reading due to possible offset on output.. Fredos

4th December 2007, 08:53 PM	#8
fernando_g diyAudio Member Join Date: Nov 2007	I'm just curious......but I have a question. Unrelated to your original question, but related to your schematic: Why are you double-buffering the triangle wave? The keyword here is double.

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