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Questions tagged [tl494]

Anything related to the TL494 integrated circuit. The TL494 is a complete PWM control circuit specially designed for switched mode power supply (SMPS) applications.

8
votes
2answers
261 views

Buck converter, squeaking/whining inductor

I have a problem with my homemade buck converter. It is based on a TL494 control chip with my discrete MOSFET driver. The problem is that my inductor squeaks and whines, when the output current ...
0
votes
1answer
55 views

Two PWM signals from TL494

I need to generate two open-loop PWM signals with different duty cycles for my converter. The frequency is 20kHz. I did generate one signal. Should I use another TL494 and connect it to the same ...
2
votes
2answers
59 views

TL494 minimum operating voltage VCC

Has anyone operated TL494 on +5VDC practically as it works in simulation software ? minimum operating voltage indicated in datasheet is +7VDC . please confirm.
1
vote
4answers
266 views

Compensating for voltage drop across current-sensing resistor in a TL494-based SMPS

I'm trying to wrap my head around this reference design from this TI document. This is a 5V power supply that is rated at 10A. ...
1
vote
1answer
1k views

Current limiting using P-CH MOSFET

I am currently building variable voltage/variable current (lab) power supply out of an ATX switching power supply. I have done voltage regulation tweak of the TL494 so now it gave me variable voltage ...
5
votes
4answers
2k views

Full bridge HVDC to modfied square sine - random half side MOSFET burn

I am trying to make a step-down 350V to 220V voltage converter. I decided to go with rather simple circuit of full bridge MOSFET inverter since my loads are only resistive or switched. I had built it ...
1
vote
1answer
450 views

Can I measure inductor current by adding a secondary winding?

I have a buck converter and I want to add a current loop to it. I don't want to use a hall-effect sensor or something expensive like that. I think it is not practical to use a sensing resistor since ...
-1
votes
1answer
130 views

How do I use one feedback pin with two error amplifiers?

I know there is a similar question asked: TL494CN and error amplifier. However, that link does not answer my question. If I need one current loop and one voltage loop on the power supply, how should ...
3
votes
1answer
131 views

Transfer function of this opamp circuit

(Source: Designing Switching Voltage Regulators With the TL494, Page 25) What does the output of this opamp give? Use approximated values if necessary. The reference voltage is \$V_R = 5V\$. Denote ...