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Old 30th June 2008, 02:10 AM   #21
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Hi, EVA,

I also think there is something wrong that makes the high-side gate resistor is much hotter than the low side gate resistor.

Since there are some suspects, how to know which one is making this?

I'm using a mix of forced clock and UCD feedback. When clock is removed, auto-oscillating about 350khz, while the clock is 375khz.
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Old 30th June 2008, 02:12 AM   #22
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Hi, Charles,

How to cure parasitic resonances? Is it looks like jitter (blurry, multiple shadow trace)?
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Old 30th June 2008, 07:20 AM   #23
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The four most important things to look at are:

1.) Layout
2.) Layout
3.) Layout
4.) Decoupling

Make sure that your layout uses the smallest possible areas within current loops and make sure to have a proper groundplane.

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Charles
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Old 30th June 2008, 01:37 PM   #24
Tahmid is offline Tahmid  Bangladesh
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hi,
You could try to use IR2181.
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Old 8th July 2008, 09:14 PM   #25
Tahmid is offline Tahmid  Bangladesh
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hi,
Better alternatives for the older IR2010-2113 are the IR2181, IR2184 from International Rectifier.
ST Microelectronics also provides high quality high low side MOSFET driver - L 6384 to L 6388. These internally contain the bootstrap diode.
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Old 10th July 2008, 07:40 AM   #26
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Hi, Charles,

Comparing groundplane and layout with care of current loop (like fig7 and fig8 of IR's AN-1135). Which is more important? Can I make good PCB only caring the currentloop, without groundplane? The problem with groundplane is that while the tracks have to be as wide as possible (to make low parasitic inductance), putting groundplane below wide tracks equal to make parasitic capacitance.
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Old 10th July 2008, 08:47 AM   #27
Eva is offline Eva  Spain
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Don't worry about a few dozen pf of distributed capacitance in high current paths.
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Old 10th July 2008, 01:51 PM   #28
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Hi, EVA,

After reading that appnote, a little question pop up in my mind. Ground plane (-rail plane for a design using high/low driver), besides give parasitic capacitance (can do both positive and negative effect (like parasitic capacitance to inverting input) to a different cct), they also give low inductance+low resistance path for current loop, say for Vgs loop.

Could it be that the positive effect of ground plane is actualy this good loop path itself? For example, many designs make good Vgs drive (track width, track length), but forgetting about the return current (like nF cap from source of the mosfet back to the+ supply of the high/low driver)? This is helped much by groundplane. Ordinary track is inferior to groundplane if we look at this aspect.
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Old 10th July 2008, 02:15 PM   #29
Pafi is offline Pafi  Hungary
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Quote:
Ground plane [...] also give low inductance
Quote:
Could it be that the positive effect of ground plane is actualy this good loop path itself?
(I'm not Eva, but) Yes, most of the times!
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Old 11th July 2008, 06:29 AM   #30
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Could it be that the positive effect of ground plane is actualy this good loop path itself?
Yes and it is making your reference "rail" the least inductive that is possible.

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