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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 supply and ground to generate the second signal?
  • Will the two signals be synchronized?
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    \$\begingroup\$ It's not guaranteed that two independent TL494s will have the exactly same switching frequencies with the same RT and CT values. So a second TL494 may not be syncronized to the other one. Some other controllers (from TI, ON etc) have a SYNC pin for syncronizing. Maybe you should try one of them. \$\endgroup\$ – Rohat Kılıç Feb 4 '19 at 4:52
  • \$\begingroup\$ Will shorting the RT and CT pins on the two TL494s be able to give synchronised values? \$\endgroup\$ – Niteesh Shanbog Feb 4 '19 at 5:00
  • \$\begingroup\$ @Sparky256 How do I generate the PWM signals for the gates of my MOSFETs? Any IC you would recommend? \$\endgroup\$ – Niteesh Shanbog Feb 4 '19 at 5:12
  • \$\begingroup\$ @NiteeshShanbog. We cannot recommend specific products on this site, but gee-whiz there must be a thousand PWM controller IC's to choose from. Think about what your goal is and work from there. Without a clear goal you are lost... \$\endgroup\$ – Sparky256 Feb 4 '19 at 7:04
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Texas Instrument's application report Designing Switching Voltage Regulators With the TL494 contains a section about synchronization, including multiple TL494's in a master/slave setup. See section "4.2.1 Synchronization"

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