@@pietpaaltjes7419 pretty much any of them that are less than 400 watt. I grabbed 3 of the closest larger SMPS (aka not wall warts) from unknown random product and two were newer ones with smd stuff and one had a TL494 and all of them had the TL431 to go with it!
I actually don't have this part untill I saw some youtubers and online shcmatics using them, still though its not my got to choice for push pull since its outdated IC.
Aside from power supplies, the TL494 can be used for other PWM applications like Class-D audio amplifiers. UA-camr MIKROWAVE1 built a junkbox AM transmitter using a TL494.
That's the best video I've seen on the TL494. I'd love it if you would do a design video showing how to calculate the component values depending on the desired output voltage. Thanks a bunch!!
The diode on the pcb you pointed out is not the same one as in the datasheet. Diode D55 likely is. L51 is the inductor with a bit of capacitor like package.
Scruffy waveform! I remember a nice solid square waveform with variation of the centre +VE going line moving between the fixed frequency -VE going pulses on either side.
It would be nice to see the w.f. of one of the two o.p. pins w.r.t the osc. pin w.f. especially when under " stable steady state" ..( i.e. when there are no load or line variations).
Commonly used in PC power supplies of the past. I recently rewired the secondary of such a transformer to have a variable output up to about 36ish volts. Still musing about the compensation network. Could you do a video on that? Seems somewhat cursed. Very useful IC though.
This is a part that almost everyone watching has around somewhere.
Not me 😢
Yep, it is in so many old pc (ATX?) power supplies.
@@pietpaaltjes7419 pretty much any of them that are less than 400 watt. I grabbed 3 of the closest larger SMPS (aka not wall warts) from unknown random product and two were newer ones with smd stuff and one had a TL494 and all of them had the TL431 to go with it!
Ah Yes, the golden olden TL 431. Has that one been chip of the day? Probably ;-)
I actually don't have this part untill I saw some youtubers and online shcmatics using them, still though its not my got to choice for push pull since its outdated IC.
A really flexible chip that can be used for a whole bunch of DC-DC and AC-DC switching applications. Thanks for the video.
Pretty common to the point of being jelly bean. Thanks for showing.
This is an old part 🙂 I remember working through the calculations at school 30 years ago.
Aside from power supplies, the TL494 can be used for other PWM applications like Class-D audio amplifiers. UA-camr MIKROWAVE1 built a junkbox AM transmitter using a TL494.
Used in every car amp in history, along with its stable mate the SG3525.
02:10 At 10A, that 0R1 R13 current sense resistor should be rather beefy.
Interesting one...cheers.
Hey Andy, how are you ? 🧀
@@frankowalker4662 Hey Franko !! hope you are well I'm am fine, health is getting much better ..........RIP Calculon. say hi to all !!
@@andymouse I'm doing good, thank you. I'll say Hi to all at Broons. We miss you there. Get wel soon Mate. ❤
RIP Calculon.
That's the best video I've seen on the TL494. I'd love it if you would do a design video showing how to calculate the component values depending on the desired output voltage. Thanks a bunch!!
The diode on the pcb you pointed out is not the same one as in the datasheet. Diode D55 likely is. L51 is the inductor with a bit of capacitor like package.
I have an 70's era recollection of using that functionality as an FM receiver demodulator.
Scruffy waveform! I remember a nice solid square waveform with variation of the centre +VE going line moving between the fixed frequency -VE going pulses on either side.
PTC/NTC, not RTC 😃
A fairly big difference with the datasheet example is the supply voltage and feedback through an optocoupler.
Random Temperature Coefficient.
It would be nice to see the w.f. of one of the two o.p. pins w.r.t the osc. pin w.f. especially when under " stable steady state" ..( i.e. when there are no load or line variations).
More cct waveforms and analysis would be great, Thanks
I find it interesting that the reference circuit is not isolated from the line...
It is. The TL494 is on the secondary side.
Commonly used in PC power supplies of the past. I recently rewired the secondary of such a transformer to have a variable output up to about 36ish volts. Still musing about the compensation network. Could you do a video on that? Seems somewhat cursed. Very useful IC though.