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Old 28th March 2006, 04:12 PM   #51
subwo1 is offline subwo1  United States
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Kanwar,
I like the IR22110 in the circuit. I have yet to try some IGBT's. I like how MOSFETs have body diodes since it saves having to add in external freewheeling diodes.
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Old 28th March 2006, 04:27 PM   #52
subwo1 is offline subwo1  United States
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Default Re: Re: Re: Re: MOSFET driver buffer

Quote:
Originally posted by mzzj


In case link outdates, try searching "an70" and look for "A Monolithic Switching Regulator with 100mV Output Noise"
http://www.linear.com/pc/downloadDoc...30,P1535,D4159
Starting somewhere page n. 55 is small EMI-probe. Small size makes it possible to track down even invidual high-dI/dt traces on board, crappy recovery behaviour etc.
I am glad it finally came through since PDF causes my computer trouble under even good circumstances. The document has some really useful information in it. I think I will find it interesting to simulate the LT1533 in LTspice. Gotta start working on one of those probes.

Quote:
Btw toroidal transformer construction shown on page 52...what a hell they were thinking?
It doesn't look like the lowest leakage inductance was the objective.
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Old 28th March 2006, 04:30 PM   #53
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Quote:
Originally posted by subwo1
Kanwar,
I like the IR22110 in the circuit. I have yet to try some IGBT's. I like how MOSFETs have body diodes since it saves having to add in external freewheeling diodes.

Hi Subwo1,

Yes you are right buddy, but IGBT offers a low cost solution and freewheeling diodes are then to be connected externally for fast reverse recovery...IR2110 serve as simple and effective approach as well...
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Old 28th March 2006, 05:40 PM   #54
subwo1 is offline subwo1  United States
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Quote:
Originally posted by Workhorse
Hi Subwo1,

Yes you are right buddy, but IGBT offers a low cost solution and freewheeling diodes are then to be connected externally for fast reverse recovery...IR2110 serve as simple and effective approach as well...
Thanks for those thoughts, Kanwar. I plan to investigate the prospect of using some IGBTs, especially in ZVS circuits, along with IR2110 drivers.
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Old 29th March 2006, 01:52 AM   #55
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Default Stone-Age

Eva, Sobwo1 and mzzj,

You three are making me feel as if I'm stuck in the stoneage with my rails of old Motorola MTW20N50Es (1998 date codes) with their 0.24W Rds(on). I had planned on using some of them in my revived half-bridge SMPS. When I get the time, and $$, I will order some really good IGBTs, perhaps from IR. But I will stick with my batch of old 1990 date coded IR2110s.

Steve
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Old 29th March 2006, 01:59 AM   #56
mzzj is offline mzzj  Finland
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Default Re: Stone-Age

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Originally posted by N-Channel
Eva, Sobwo1 and mzzj,

You three are making me feel as if I'm stuck in the stoneage with my rails of old Motorola MTW20N50Es (1998 date codes)
Steve
Those MTW's didnt look bad at all compared to IRFP450.
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Old 29th March 2006, 02:04 AM   #57
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Default MTW vs. IRFP

Yeah, I looked at the spec sheets for both, the IRFP450 is equivalent to the MTW14N50, and the MTW20N50E is equivalent to the IRFP460.....
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Old 29th March 2006, 02:13 AM   #58
mzzj is offline mzzj  Finland
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Default Re: MTW vs. IRFP

Quote:
Originally posted by N-Channel
MTW20N50E is equivalent to the IRFP460.....
Equivalent in rds-on but IRFP460 has 3 times bigger Crss making it #!"% useless in bridges. I would exchange my stock of IRFP450's any day to MTW's
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Old 29th March 2006, 02:26 AM   #59
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I meant in the Vdss and Id ratings. I wasn't looking at the C(iss) or C(rss), but now that you mention it, that's a boatload. I almost bought a rail of the '460s from eBay. Glad I passed.
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Old 29th March 2006, 02:29 AM   #60
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Go on, MTW20N50E are somewhat better than my old IRFP460 (probably from early 1990s), MTWs have three times lower reverse transfer capacitance and lower Rds-on. Also, currently I only have 4 of these devices, but if I had rails full of them I would consider using them as a challenge. You can paralell banks of two or three and use high current buffers to drive the gates (see ZTX851 and ZTX951, I was using these as emitter followers driven from a CD4050 with all 6 gates paralelled).
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