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car smps based on TL494
car smps based on TL494
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Old 11th November 2004, 01:01 PM   #41
bigbulb is offline bigbulb  Canada
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Here's a schematic of complete power supply using TL494. I had tried this and it works perfectly. I'm using EPCOS E32-16-9 N87 grade core and adjust the frequency to 80Khz.The specs from EPCOS says the core can handle 500W Max. at 100Khz.
Check here:


Hope this help.........
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Old 14th November 2004, 12:34 PM   #42
RX5 is offline RX5  Philippines
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thanks for the link..

btw, >EPCOS E32-16-9 N87 is this a toriod??
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Old 15th November 2004, 03:32 AM   #43
N-Channel is offline N-Channel  United States
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Talking Good PWM Chip(s)

Hey Guys,

Check this chip out- ON Semi's MC33025. Originally based on the SG3525, it has a higher bandwidth error amp, oscillator up to 2MHz, totem-pole outputs good to +/- 2A (for driving really BIG MOSFETs) , and can operate either voltage- or current-mode , like the UC1846. Go to ONSEMI.com and look up MC33025 in the search line. This chip is identical to Untirode's (Now TI's) UC3825.

BTW, the MC- prefix comes from the fact that it was around before Motorola spun off their semiconductor products sector.

Best of all, you can get FREE samples from ON's website. Try to limit to only a few at a time.

I have used this chip, and for hard-switching PWM control applications, this is the best (and easiest ) chip I have used.

For those who may have used this chip, Please post your experiences. Thanks!

'73, de N8XO

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Old 16th November 2004, 02:11 PM   #44
bigbulb is offline bigbulb  Canada
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Hi RX5,
No, that is E type, which is 2 pcs of E shape core with a plastic bobbin. You can download the specs from Epcos web site,
here's the link:
and download the design tools and you can design your own transformer for PWM type power supply.
I had read a lots of articles, toroid is not design for power trans, it can be used as power trans but I prefer proper core so that I can design virtually any wattage I want. I have E55 type core which can produce nearly 2KW while working at higher frequency, but car battery is a main problem here, current will be too high, around 185Amp while blast to full power........

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Old 6th December 2005, 02:06 AM   #45
leinahtan is offline leinahtan  Philippines
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Default tl494 smps from JBL......

here is a sample of SMPS using TL494 by JBL.....they use it on their sub
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Give me such thing and i'll give back to you......
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Old 5th June 2006, 02:16 PM   #46
RX5 is offline RX5  Philippines
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hello all

here is MY update..... TL494 CAN be used in SMPS/car amp.... just did/actually tested these a few days ago... now its driving my 100W RMS amp/subwoofer assy..

SG3525 chips require no buffer?? (correct me if im wrong) when driving N-ch mosfets.....like SG3525 ->> N- mosfets


TL494 needs one.... a basic push-pull (npn-pnp) buffer is all that is needed to drive the N-Ch mosfets.... and everything worked out beautifully... TL494 ->> npn/pnp buffer ->> N- mosfet

Ive been playing around with TL494 before.. and it always HEATED up my mosfets... not knowing I was driving them in the linear region.... what the circuit REALLY needed was a buffer betweeen the chip and the Mosfets.... the TL494 is running in push-pull mode @100KHz... works GREAT!!

ive even added up a softstart ...

I can post diagram if your interested... no PMs pls...
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Old 7th June 2006, 04:35 PM   #47
palesha is offline palesha  India
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Pl. Post the diagram along with softstart.
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Old 9th July 2007, 06:10 PM   #48
microp is offline microp  Latvia
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Default OK! Beautiful work guys!!!

I want to construct it

The only problem is that I have one ETD44 and two ETD49 transformer cores....

Could please somebody answer me.... how much power I can get from these cores. In my country I can't by anything else.

I need 400 to 500W of power. I have searched sites and there is nothing about real power... hundreds of hard formulas.

From this thread I now almost everything about schematics!!! Four pairs of IRFZ44 and it will be 500W..... just transformer

The frequency I will set buy your recommendations!

Please help!!!


I have created amp already... just SMPS!
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Old 10th July 2007, 08:39 PM   #49
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I built this Rod Elliot design. Very good.
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Old 10th July 2007, 08:43 PM   #50
Netlist is offline Netlist  Belgium
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You have a nice project there and I believe you will get better response if you stick to one thread to discuss it.

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