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Madness
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Posted: 07 March 2017 at 8:44am | IP Logged Quote Madness

I guess that would apply to the IR2110's as well.

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Posted: 07 March 2017 at 8:59pm | IP Logged Quote Warpspeed

Madness wrote:
I guess that would apply to the IR2110's as well.

IR2110's are mos technology and don't need output protection diodes.
http://pdf1.alldatasheet.com/datasheet-pdf/view/82793/IRF/IR2110.html

Usually the first page of any data sheet will tell you if the chip uses bipolar or mos technology, and the application notes will usually include some circuit examples of good practice. Any special requirements such as output protection diodes will be shown or not there as appropriate.

Here is the data sheet of a fast (1.5 Mhz) PWM control chip that uses bipolar transistors and has a totem pole output. The example circuit shows the protective Shottky diodes on the gate driver outputs.

http://www.ti.com/lit/ds/symlink/uc2825.pdf

Edited by Warpspeed on 07 March 2017 at 9:11pm


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Posted: 07 March 2017 at 11:38pm | IP Logged Quote Madness

Thanks Warp,

No Diodes on the IR2110 example circuits and they are MOSFETs, I have learnt something :)

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Posted: 16 March 2017 at 10:37pm | IP Logged Quote Madness

If anybody is interested you can buy HY4008W MOSFETs HERE for $1.37 X 100. There are smaller quantities available, I asked if they were any cheaper the 100 and they created this listing. I have bought from this supplier before and they all tested within 0.1 milliohms of 2.7 milliohms RDS ON.

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Posted: 19 March 2017 at 9:55pm | IP Logged Quote Madness

So far I have not had any success with adding drivers, I have ordered some IRS2186S driver IC's. These are rated at 4 amps rather than the IR2110's 2.5A, they work exactly the same as the IR2110's but unfortunately have the pins moved around so they won't just drop into the existing boards. The ones I have ordered are surface mount and are a lot cheaper than the type that will plug into a socket.

What I plan to do is put them on a small PCB similar to how we mount the EG8010 and fit them on to the power PCB. In the research I have done there is lots of mentions about keeping the distance between drives and the MOSFET's to minimum. Another thing I have found too is that the high side drive should be run as close as possible to their relevant ground (the Bridge). This is the same as how it has been done on the Chinese boards and Clockman's.

I built another power board last week and it all worked perfectly with 24 MOSFETs giving a perfect waveform, then I added CAPS to the board and spikes appeared and the idle current went from 0.25A to 5A.

Meanwhile I have been trying to isolate why I am getting different results to others and in Poida's thread there is mention of tank circuits etc and what could be causing ripples etc. My heat sinks are very large and electrically part of the primary circuit to the transformer. So I have made a half size test PCB and used some offcuts of heatsinks to make a minimal size version. So far this is woking perfectly. Idle current with the single core toroid is around 12 watts.

The heatsink on the control board is from a flat screen TV, they have lots of nice squat heatsinks like this that don't add any unnecessary height to the PCB.




This is with no load



This is with load as shown in the first image




Edited by Madness on 19 March 2017 at 10:47pm


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