Electrical Engineering Stack Exchange
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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.

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

See Texas Instruments TL494 datasheet.

31 questions
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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 exceeds a certain value. As an inductor, I have first…
KamilWitek
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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 and tested today, however, without any success.…
user92809
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Is this a right way to drive MOSFET driver

I've designed the boost converter below: Aside from the irrelevant voltmeter parts which are not connected, I'm asking if the way I'm driving the MOSFET is correct. Working is simple, when TL494 let's current from its transistors, voltage will…
CaveScientist
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Why is there no frequency compensation required in TI's TL494 example buck regulator design?

This example circuit is given in Texas Instrument's application note SLVA001: "Designing Switching Voltage Regulators With the TL494": They use a 140 μH inductor and a 220 μF electrolytic capacitor for the LC filter (capacitor value not printed on…
Unimportant
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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. I see they are using one error amp to limit current and another to stabilize voltage. At 10A voltage drop across R13…
Beowulfenator
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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 the opamp output as \$V_e\$. Considering that the…
hkBattousai
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TL494/TL594 measure current with grounded load

Multiple examples of current limiting with TL494/TL594 suggest to use current sensing resistor between load(-) and GND. But I want load to be grounded. Can current sense resistor be placed above load(+)? Can I use external Rail-to-rail OpAmp this…
avi9526
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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.
Anil KG
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What is the most used bi-polar output SMPS topology in gate driver isolation?

I have some questions concerning this schematic: What is the topology used here? I am guessing flyback without feedback circuitry. Why is the TPS40211 utilized here? Is it to provide more current? Rather than using the 15 V of the input, this chip…
Younes Thabet
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How to fix hot PWM and crack 6A High-Speed MOSFET Driver?

My boost converter boosted voltage for a few seconds but it made a crackling sound, probably burnt. It doesn't switch the MOSFET now and TL494 is getting hot from the upper side which is where error amplifier pins are placed. The schematic is…
CaveScientist
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Operation of the generic ka7500(tl494) based boost board and soft start adaptation

I am examining the operation of a boost card found in many cheap inverters, with a KA7500, EG7500 or tl494 IC type. Here is the diagram that can be found everywhere: My question are: what is the purpose of R14, E21 and D1 ? how act the first…
Ambroise
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Voltage regulation using TL494

I want to use TL494 IC for voltage regulation. For this, I am giving a 2.5 V reference to the inverting pin of the error amplifier and wants to vary a voltage from 0- 5V at the non inverting terminal through potentiometer. And having a gain of 100…
ashu_09
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Problems with TL494 boost converter

I'm building a DC-DC step-up (boost) converter using TL494. The schematic is attached Input voltage: 9V The resistive divider at the output sets the output voltage to about 14V Desired output current: 3-4A The inductor is wound on a ferrite powder…
Anton
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TL494 error amplifier pin maximum voltage input

I'm designing a 60V SMPD for my CNC milling machine using a TL494. I've have successfully driven the gate drive transformer which can in turn drive the MOSFETs. I am able to get 60 up to 70V output from the transformer. I'll do rectification and…
Gizachew Mebratu
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Tl494 converter powerend kind of oscillation / buzzing

I'm in trouble with designing and testing tl494 halfbridge converter (schematic based on atx power supply and this one: https://www.hobbyelektro.eu/spinany-zdroj-0-30v-0-6a/) Converter wasnt quite working, so I decided to make it part-by-part.…
fifi_22
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