Making car amplifier SMPS with tl494 + DC Protection

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#641
8Riccardo9 have you built the SMPS that you gave the pcb for?
Does it work ok?
Anyone else has built it?
I don't have access to an oscilloscope (as suggested at Rod Elliot's site) and I'm hesitating in building it. Has anyone built it, successfuly, without testing it in an oscilloscope?
 
#645
simingx said:
I have built the PSU and it works!

Slight modifications (to make the circuit similar to the one found at ESP):
10k resistors replaced by 12k
Remove one of the 10k resistors immediately above the 3525
Remove the 1k resistor in the same place
Add a 12k resistor from pin 1 to pin 9 of the 3525
Gate resistors changed to 22 ohms

MOSFETs used are Infineon SPP80N06's and output rectifiers are MUR1520s.
The shutdown/standby circuit works, it disconnects power to the chip instead of using the chip's own shutdown input.


Efficiency is >90% (estimated), the (small!) heatsink only gets slightly warm at ~100W output.

I accidentally shorted the output while testing... nothing happened other than a BIG spark.

This will power a pair of Red Rocks Audio D200's 🙂
Click to expand...


Hi simingx

I am trying to replicate the smps project on ESP page
i like your design and would like to copy it
on the ESP page: http://sound.westhost.com/project89.htm
you have two shematics, the original one at the top of page and the simplified version : my question which one did you modify ?

on the image you posted , i see two transistors? are these to drive the Mosfet's ? if so they should be 4 , 2 to make a push pull
what's that small choke beside the toroid?
are you using a single input capacitor?
could you please post the final schematic and the components ratings, i 'll be thankfull


by the way guys this a great thread , please keep feeding it with your awesome works
 
#648
Is this possible?

Is is it possible to make project like this but with only one output rail (e.g. 50V), same low voltage side, just to make one winding on secondary of transformer and than all same (full bridge rectifier, inductor and capacitor)? 😕
I tried to do this :smash:, but i have some problems :headbash:, so i need second opinion can this idea be realized?
 
#650
OK, thanks, but....

I found one previous post by Eva:
In a push-pull converter symmetric output rectification is required for proper core flux balancing. Use either two windings in opposite directions and two diodes or a single winding with four diodes.
I know what you mean, luka, but i think that eva's post is true, and i tried something already, and i have some results, except i have a little problem about voltage drop on output.
I one question, how to determine primary number of turns for different cores and input voltage? I know there is a lot of books, but as i sad i'm little 😕 so i need some quick guide to determine it.
Thanks luka, first class site is impressive. 😱
 
#656
its somewhere in this thread, should be easy to find out

This is the amp right?
P1010019.jpg
 
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