• UC2845: UC2845: Irregular duty cycle (Max and min)

  

  Tung Dao

  TI Thinks Resolved

  Part Number: UC2845 Tool/software: I designed a flyback converter using the UC2845. The output meets the design specifications; however, when operating in Peak Current Mode, the duty cycle becomes highly inconsistent under all load conditions. Specifically…

  • 10 months ago
  • Power management
  • Power management forum
Answered

• UC2845: UC2845D Reliability Information

  

  Melanie Lozada-Nevarez

  Resolved

  Part Number: UC2845 Please provide feature size for UC2845D.

  • Resolved

  • 3 months ago
  • Switches & multiplexers
  • Switches & multiplexers forum

• UC2845: fosc setting

  

  Hideki Hayashi1

  TI Thinks Resolved

  Part Number: UC2845 Hi team, Customer want the device switching at 250kHz, so 500kHz should be fosc. However, if the setting Rrt = 5kohm, Cct=1nF as a minimum value of recommneded range, fosc becomes 344kHz (1.72/5k/1n) How can customer set to fosc…

  • 6 months ago
  • Power management
  • Power management forum

• UC2845: UC2845

  

  Prasad Khatavkar

  TI Thinks Resolved

  Part Number: UC2845 Tool/software: Want to design a 2 switch forward output inductor using PQ geometry core. Appreciate guidance on the core selection and calculations.

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

• UC2845A: The recommended capacitance value for the bypass capacitor on the UC2845

  

  Koichiro Tazoe

  TI Thinks Resolved

  Part Number: UC2845A Other Parts Discussed in Thread: UC2845 Hi,could you please advise on the recommended capacitance value for the VCC bypass capacitor? Figure 7‑1 of the datasheet specifies a 1 µF bypass capacitor (CVCC1). During evaluation of our…

  • 3 months ago
  • Power management
  • Power management forum

• UC2845: UC2845 output voltage control loop is unstable because of different batch of LM2904DR

  

  Gabriel Wang1

  TI Thinks Resolved

  Part Number: UC2845 Other Parts Discussed in Thread: LM2904 , Dear Expert We use LM2904DR as UC2845 flyback voltage control loop ,and we found in some batch LM2904 output nosie could be unormal . This is our LM2904 voltage control loop sch ,IN- (PIN2…

  • over 2 years ago
  • Power management
  • Power management forum

• UC2845: UC2845AD8TR production status

  

  Matt Harris

  TI Thinks Resolved

  Part Number: UC2845 I have the UC2845AD8TR on my PCA parts list and this has been flagged as being placed on LTB status by TI. Does TI offer a direct replacement for the UC2845AD8TR device ?

  • over 2 years ago
  • Power management
  • Power management forum
Answered

• UC1845: the difference between UC1845 and UC2845

  

  Jack Li-SH

  Resolved

  Part Number: UC1845 Other Parts Discussed in Thread: UC2845 Dear sir, quick questions: Q1: what is the difference between UC1845 and UC2845, except for temperature? Q2: whether we have SOIC package of UC1845 now? Nice day! Regards, Jack

  • Resolved

  • over 2 years ago
  • Power management
  • Power management forum

• UC2845: current limit for ISENSE pin

  

  Brian Li

  TI Thinks Resolved

  Part Number: UC2845 Hi team, My customer is using our UC2845. They find in their application the UC2845 and the MOS will all broken. And they find there's burn mark on the Rcs. So could you please help check the current limit for the ISENSE pin…

  • over 2 years ago
  • Power management
  • Power management forum

• UC2845: Pspice model of this controller throwing convergence issue, and voltage on the RT/CT is showing as 80V, In the spice circuit I am not applying 80V anywhere

  

  Makkena Teja

  TI Thinks Resolved

  Part Number: UC2845 Tool/software: Pspice model of this controller throwing convergence issue, and voltage on the RT/CT is showing as 80V, In the spice circuit I am not applying 80V anywhere, here I am simulating a simple flyback converter with input…

  • over 1 year ago
  • Simulation, hardware & system design tools
  • Simulation, hardware & system design tools forum

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