• UCC28740: UCC28740

  

  Robert Bachus

  Part Number: UCC28740 Tool/software: Thanks for the reply. You were right, of course, about the three DRV pulses. I have attached the resulting waveforms at testpoint Vsw, after recommended changes per sluaac5.pdf Figure 1.1 were made on the primary…

  • 2 months ago
  • Power management
  • Power management forum

• UCC28740: UCC28740

  

  Robert Bachus

  Part Number: UCC28740 Tool/software: Based upon WBSchematicUCC28740DR.svg (attached) there is never any DRV output. The only waveform is on pin 1. Attached Vicor VI-J51_N3.pdf

  • 2 months ago
  • Power management
  • Power management forum

• UCC28740: FET switching noise issue

  

  JH Shin

  TI Thinks Resolved

  Part Number: UCC28740 Tool/software: Hello, My customer designed a flyback circuit using UCC28740 and is testing its operation. The following issue is encountered: - Test Conditions : Input voltage: 750Vdc, Output: 12V/6A (PWM FAN load) Issue - Output…

  • 5 days ago
  • Power management
  • Power management forum

• UCC28740: Can't open SIMPLIS model

  

  Beida Song

  TI Thinks Resolved

  Part Number: UCC28740 Tool/software: Hi Expert, Customer download the UCC28740 SIMPLIS model, but there is an error when they try to open it. Can you help solve it?

  • 11 days ago
  • Power management
  • Power management forum

• UCC28740: Abnormal Output During Fault Test

  

  Francis Jiang

  TI Thinks Resolved

  Part Number: UCC28740 Tool/software: Hi Team, Customer use UCC28740 in parallel, and when they doing fault test - input power supply failure, then found one of the device cannot re-start work. Below is the waveform blue is normal UCC28740 output, green…

  • 10 days ago
  • Power management
  • Power management forum

• UCC28740: Circuit review and issue support privately

  

  JH Shin

  TI Thinks Resolved

  Part Number: UCC28740 Tool/software: Hello, My customer designed a Flyback circuit with UCC28740. They are having issues with FET switching noise. Could you please provide a review of the circuit and support for the issue privately? Thank you. JH

  • 8 days ago
  • Power management
  • Power management forum

• UCC28740: Protection function may stop oscillation at startup_No.2

  

  H.sin

  TI Thinks Resolved

  Part Number: UCC28740 Tool/software: Hi. Sorry I closed the thread, but I need to ask the question again. As for RC snubber, I'll give it a try. But which protection do you think is working for shutting down the IC by this ringing? OVP? or UVLO? …

  • 18 days ago
  • Power management
  • Power management forum
Answered

• UCC28740-Q1: No PWM Output with 24V VDD

  

  Tom Tsao

  Resolved

  Part Number: UCC28740-Q1 Other Parts Discussed in Thread: UCC28740 Tool/software: Dear TI Support Team, I am currently working with the UCC28740-Q1 in my application and have encountered an issue. I applied 24V to the VDD pin of the IC, but I observed…

  • Resolved

  • 25 days ago
  • Interface
  • Interface forum
Answered

• UCC28740: Protection function may stop oscillation at startup

  

  H.sin

  Resolved

  Part Number: UCC28740 Tool/software: Hi.Team In circuits using the UCC28740, in very rare cases, the oscillation may stop and restart when the power supply starts up due to the protection function. I need to know if there is any way to prevent this phenomenon…

  • Resolved

  • 26 days ago
  • Power management
  • Power management forum

• UCC28740-Q1: UCC28740-Q1 and 2. UCC28730-Q1

  

  Jithin Elimban

  TI Thinks Resolved

  Part Number: UCC28740-Q1 Tool/software: Hello We are planning to use, UCC28740QDRQ1 and UCC28730QDRQ1 in our design, But we need it to operate over a temperature range of -55 to 150degC . But as per datasheet recommended operating temp is given as -40 to…

  • 4 months ago
  • Power management
  • Power management forum

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