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Old 30th April 2004, 12:46 AM   #31
Grucho is offline Grucho  Croatia
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Quote:
Originally posted by himanshuraval
hi all of you,
I built that smps but both the mosfet are buz11 and it is heated very much and the smps is taking 7amp. to 9amp. without any load at output power so please hint about it

Check gate resistors ! I have one time placed to gate of one mosfet wrong resistor and I haved similar problem .
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Old 30th April 2004, 01:09 AM   #32
Tensop is offline Tensop  Lebanon
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a coupler cap between 12v input and the centretap on the primary side, care to explain in more detail?
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Old 30th April 2004, 07:22 AM   #33
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Quote:
Originally posted by Grucho



Check gate resistors ! I have one time placed to gate of one mosfet wrong resistor and I haved similar problem .
hi grucho,

i have used 100ohms at all four mosfet and my toroid's core size is 35mm(outer dia)x15mm(hight) and winding is 4x4 pri. 12x12 sec.turns but buz11 is heatiing within 5 seconds
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Old 30th April 2004, 07:27 AM   #34
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hi risto,
please what is your core size and winding data with wire gauge wich you used with your this smps
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Old 30th April 2004, 03:45 PM   #35
tico70 is offline tico70  Costa Rica
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himanshuraval,

Just a question, are you using a heatsink for the mosfets?

I am using the following circuit and it work perfectly. I am still working with two types of cores (toroid and ETD39)...for now the toroid is performing better and much easier to wind..

Click the image to open in full size.
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Old 30th April 2004, 06:39 PM   #36
Grucho is offline Grucho  Croatia
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Hi.

Remove transformer, and check mosfets, they should be cold when smps is runing.

I run my smps mosfets without heatsink, and they are cold under small load.

Current without load is from 100mA-500mA.


Quote:
Originally posted by himanshuraval


hi grucho,

i have used 100ohms at all four mosfet and my toroid's core size is 35mm(outer dia)x15mm(hight) and winding is 4x4 pri. 12x12 sec.turns but buz11 is heatiing within 5 seconds
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Old 3rd May 2004, 07:17 AM   #37
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Quote:
Originally posted by Grucho
Hi.

Remove transformer, and check mosfets, they should be cold when smps is runing.

I run my smps mosfets without heatsink, and they are cold under small load.

Current without load is from 100mA-500mA.


hi grucho
wich schematic do you use please and please send with pcb if you have layout
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Old 3rd May 2004, 09:20 AM   #38
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Tico70:
How to winding the transformer? How many turns have you used for primary and secondary?

TIA.
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Old 3rd May 2004, 03:22 PM   #39
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Quote:
Originally posted by powerp
Tico70:
How to winding the transformer? How many turns have you used for primary and secondary?

TIA.
hi powerp,

my troroid core size is 45mm(outer dia) x 10mm and winding is pri:4x4 turns and sec: 12x12turns
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Old 3rd May 2004, 03:34 PM   #40
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Quote:
Originally posted by Grucho
Hi.

Remove transformer, and check mosfets, they should be cold when smps is runing.

I run my smps mosfets without heatsink, and they are cold under small load.

Current without load is from 100mA-500mA.


hi grucho
i have removed transformer and check mosfet that is properly working and no consupt currunt but i removed first secondry of transformer and check and thats no consupt current but when i connect the dc circuit the circuit take much current and then after i removed power caps of dc output smps is running with about 900ma to 1amp. without any load at dc output
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