• UCC28742: UCC28742

  

  Cui Zhang

  Part Number: UCC28742 UCC28742 is broken while doing surge test.

  • 23 days ago
  • Power management
  • Power management forum

• UCC28742: Brown-out feature and differences between UCC28740 vs UCC28742?

  

  AnBer

  TI Thinks Resolved

  Part Number: UCC28742 Other Parts Discussed in Thread: UCC28740 , , PMP Team, -Brown-out: With both UCC28740 and UCC28742 controllers, a brown-out function can be set via the resistors on the VS pin. Do we have more information on the Brown-out function? …

  • 1 month ago
  • Power management
  • Power management forum
Answered

• RE: UCC28742: Can UCC28742 be used without opto-coupler?

  

  Kazuya Nakai59

  Resolved

  Hi JCHK, Thank you very much for your reply and I'm sorry to be late my response. Your reply is very helpful for us. Thank you again and best regards, Kazuya.

  • 1 month ago
  • Power management
  • Power management forum

• UCC28742: Question about VdsMax of switching NMOS FET in the attached Webench design file.

  

  Kazuya Nakai59

  TI Thinks Resolved

  Part Number: UCC28742 Hello guys, One of my customers run Webench to design a flyback power supply as the following conditions using UCC28742. Vin = 1200V, (1.2kV) Vo = 24V, Io = 6A The result is attached. In the result, transformer drive NMOS FET (M1) is…

  • 3 months ago
  • Power management
  • Power management forum

• UCC28742: overload protection & valley switching mechanism

  

  Charles Zhang1

  TI Thinks Resolved

  Part Number: UCC28742 Hi Team, I have some questions about UCC28742- 1) What's the relationships between Vocp(1.5V), Vccr(363mV) and Vcst_max(770mV)? And what's the function of each parameter? According to the datasheet, Rcs is determined by the Iocc…

  • 5 months ago
  • Power management
  • Power management forum

• UCC28742: Issue in start-up

  

  Akash Harsh

  TI Thinks Resolved

  Part Number: UCC28742 Hello Sir/Madam, I have designed 25W,18V flyback converter using UCC28742. We are facing issue during startup. IC is turning off after around 900ms. Below are the attached waveform of CS, VDD, AUX(VS gain is 10/57) and VDS. . I…

  • 7 months ago
  • Power management
  • Power management forum
Answered

• UCC28742: Formula derivation

  

  Skylar Li

  Resolved

  Part Number: UCC28742 Hi Experts: Customers want to know how to derive the fomula below and especially why is there a "2" here? Thank you.

  • Resolved

  • 9 months ago
  • Power management
  • Power management forum

• UCC28742: OVP and VDD from design spreadsheet tool

  

  Kelvin Le THS

  Part Number: UCC28742 Hi, I have a few questions about the default example in the design spreadsheet Q#1 In the design calculator, the overvoltage thresholds are VOUT_OVPnom = 5.3V and VOUT_OVPmin = 5.023V (calc cell C191). VOUT_CV = 5V, VOUTripple = 50…

  • 11 months ago
  • Power management
  • Power management forum
Answered

• UCC28742: possible typos in datasheet or design spreadsheet tool for Lp_rcmd and VDbias_blocking

  

  Kelvin Le THS

  Resolved

  Part Number: UCC28742 Hi, 1. Equation 14 for Lp calculation in the datasheet (pg26 datasheet) uses Ipp_max but in the calc tool (cell C92 of calculations tab) it uses Ipp_nom . Which one is the correct equation? 2. VDbias_blocking (cell C147 of calculations…

  • Resolved

  • 11 months ago
  • Power management
  • Power management forum
Answered

• UCC28742: the roadmap question on flyback controller

  

  Joe Ji

  Resolved

  Part Number: UCC28742 Hi expert team I'm Joe, GZ FAE and my account is SAJ. The EE of my account is solar inverter and battery inverter. Typically they use flyback to build an auxiliary power to make an isolated power for the control circuit. The…

  • Resolved

  • over 1 year ago
  • Power management
  • Power management forum

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