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  • RE: UCC28701: Abnormal behaviour on NTC pin in UCC28701

    Hi Roberto, I think you need to find the CPR form from the link which I sent before. This will be going to the quality / product engineering team who will investigate potential causes. Please reach out to your field team of TI and they should be able…

  • UCC28701: two switch flyback in DCM topology calculations.

    Part Number: UCC28701 Hello Harish: Happy New Year! Would you help me find out which spreadsheet based document you would use to get calculations for two switch DCM flyback? I will post it in the Forum as well. See below what I had used when we were…

  • UCC28701: APPLICATION FOR 600V TO 1000V BIAS

    Part Number: UCC28701 Other Parts Discussed in Thread: UCC28730 , UCC28700 Hello: We need to get an isolated converter for typ 15W output typ 22V dc , Input maybe 600v to 1000 v, typ 800v We can use 1200V devices . What controller can we use with PSR? …
    • Answered

  • RE: UCC28701: What determines the UCC28701 Operating Frequency?

    Resolved
    Hello Claire, Sorry I was on another project last 2 weeks. Thanks, I will take a look at the tools you mentioned here. Thanks for your help.
    • Answered

  • UCC28701: UCC28701 LTspice Simulation Error "Too few nodes"

    Resolved
    Part Number: UCC28701 Hello, I am designing a flyback using the UCC28701 and want to do a simulation in LTspice. I downloaded the PSpice model fro TI website and imported it into the LTspice XVII. (opened the .lib file in the LTspice and create a symbol…
    • Resolved

  • UCC28701: WEBENCH POWER DESIGNER Result does not match with TINA-TI simulation.

    TI Thinks Resolved
    Part Number: UCC28701 Other Parts Discussed in Thread: TINA-TI Hello, I am using UCC28701 to design a 20V/2A output flyback with a switch frequency around 100kHz. I downloaded its TINA-TI model from website and used the WEBENCH Designer shown below to…
    • Answered

  • UCC28701: Transformer specification

    Resolved
    Part Number: UCC28701 Hi Team, The Webench design of UCC28701DBVR provides the details of the transformer winding. Under the auxiliary winding, it states the strands 2.0. Our customer would like to know what does strands 2.0 mean. Are they two 28 AWG solid…
    • Resolved

  • UCC28701: output over-voltage function

    TI Thinks Resolved
    Part Number: UCC28701 Please let us know about over-voltage function. What is the time from overvoltage detection to device stops switching? Regards, Kura

  • UCC28701: Webench designer for Input Voltage < 85V

    TI Thinks Resolved
    Part Number: UCC28701 Hi, I am trying to design a flyback SMPS for an input of 24V and an output of 19V, 0.5A. I was looking at the UCC28701 but with webench it's not possible to enter an input voltage below 85V. Is there a specific reason for this…

  • UCC28701: is it ok to put a small capacitor between pin 5 & 6?

    TI Thinks Resolved
    Part Number: UCC28701 Hi, there is a regulation problem and we found that placing a very small capacitor between pin 5 & 6 helps. in this design, the capacitance needed to fix the regulation is 27pF. is there any issue if we do this? datasheet warns…

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