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Switched Mode Power Supplies (SMPS)

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chas1

Member
Joined 2006
none
A1000smps

I have written in a private email about the design of the smps is aimed at the 220vac market since it has a low voltage 12 volt transformer with 220vac primary only also no means of switch selection for 220/110 vac operation.I am ordering both the smps and the irs2092 amplifier.Are there doc's for these two items?

Thanks
Chas1
 
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Cristi

Banned
Joined 2008
connexelectronic.com
i've sent you a reply earlier today.
the small aux. transformer is available both in 220V version and 110V version. the smps works fine at 110V as well. the only thing what need to do when placing an order is to mention about the mains voltage value, and i can choose which transformer to use on that board and to make the jumper for the 110V.
 
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chas1

Member
Joined 2006
none
reply

Got email and responded, glad you are a member here and you monitor your threads.I need the 110 version without transformer provided the startup circuit has been tested at low line ; dc after rectifiers of about 250 volts or 100vac input.I like the idea of softswitching but a supply of 1kW or higher with that topology appears difficult at present time.I think forward using controllers with skipcycle for light loads(NCP1217 onsemi) with PFC frontend can result in a nice supply for audio.When I finish I will send docs and you are welcome to build a couple for test.I use paypal for order,how will I indicate supply I want?Also finding current mode difficult for audio I have both current and voltage mode under test with 1kW AB amp at present, fsw 150kHz.
Chas1
 
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Cristi

Banned
Joined 2008
connexelectronic.com
Smps250

i will write the manual for the smps soon. until then, please ask me if you have some questions about.
I will attach the pinout diagram and application example using this smps, TA2022 amplifier board and Speaker protection circuit
 

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K

Kjeldsen

Member
Joined 2003
kjeldsensforbindelser.dk
How to connect to TDA89xx board?

Cristi said:
the smps250 pcb size is 100x90mm. complete size including all the parts and heatsink 100x100x52mm. the output voltage can be adjusted within +-25 to +-31V range, so can be used for any TDA89xx amplifier modules.
Click to expand...

If I want to use the smps instead of my toroids, how do I connect the SMPS. Is it in the samme place as the toroid, or should I solder new connections somewhere on the circuit board?
 
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Cristi

Banned
Joined 2008
connexelectronic.com
to use the smps for the TDA89xx amplifier modules, just simply remove the rectifier bridge from the board and connect the AC1, AC2, to the corresponding + and - pins, and connect the smps to the amplifier board with regard to the correct polarity. the smps output voltage must be lower for the TDA8920 and TDA8924 amplifier boards, +-24V and for the TDA8950 can be +-30V. the voltage can be adjusted from the small pot on the smps board.
 
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