UCC3808A-2: COMP pin effect

MIT SHAH

Intellectual 715 points

Part Number: UCC3808A-2

Hello,

As written in datasheet section 7.3.1, zeroduty cyclecan be externally forced by pulling COMP to GND.

So my question is when COMP pin is pulled to gnd, which input can impact the switching of the OUTA and OUTB.

Will the IC continue switching ?

Kindly guide me on this and please find attached schematic of my Push-Pull supply.

Kindly let me know if you need mor information.

Regards,

Mit shahpsu_sch_v1_0.pdf

over 6 years ago

0 Peter Meaney over 6 years ago

TI__Mastermind 31580 points

Hi Mit,

If the COMP pin is pulled to ground than the outputs will stop switching. When COMP is low no switching can occur no matter what you do with the other inputs.

Regards

Peter

0 MIT SHAH over 6 years ago in reply to Peter Meaney

Intellectual 715 points

Hello Peter,

Thank you for your input!

In schematic,We gave three pulses : 1)Dutycycle 2)Feedbk 3)PWR, we kept frequency 100hz of all signals and varying it.

If we need to increase the voltage by 1V at "40Vadj",please guide us how to achieve this.

We connected 100E load at output.

Kidly find schematic here :4478.psu_sch_v1_0.pdf

0 Peter Meaney over 6 years ago in reply to MIT SHAH

TI__Mastermind 31580 points

Hi MIT

I do not understand what you mean when you say that you gave three pulses at 100Hz?

If the 40Vadj is the output voltage you would normally adjust the feedback potential divider to adjust the output voltage by 1V, but I dont understand your schematic and I cannot see where the output voltage is been measured from.

Regards

Peter

0 Peter Meaney over 6 years ago in reply to Peter Meaney

TI__Mastermind 31580 points

Hi MIT

Since there has been no response on this post for more than a week, I am going to close this post. Please open a new post if you have more questions.

Regards

Peter

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UCC3808A-2: COMP pin effect