Answered

• RE: LM25085A: calculator error

  

  Hongjia-Wu

  Resolved

  Hi, You can download the quick tool in the link below, it should be no issues for the E37 tab. https://www.ti.com/tool/LM25085-5085QUICK-CALC Regards, Hongjia

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

• RE: LM5085: Noise reduction - LM5085MY

  

  Timothy Hegarty

  Resolved

  Hi Martin, That's an internal sharepoint site that I can't access. Please send the schematic as a PDF. Also, here is the link to the quickstart - https://www.ti.com/tool/LM25085-5085QUICK-CALC . It only takes a few mins to fill out and gives us…

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

• RE: LM25085: Incorrect design in Webench

  

  Timothy Hegarty

  Resolved

  Hi Andras, Please use the LM25085 quickstart calculator to verify your design: https://www.ti.com/tool/LM25085-5085QUICK-CALC . Is the design operating stably based on the ripple generated by the output cap ESR? I see the FB divider is setup for a 13…

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

• RE: LM25085: LM25085 output abnoraml

  

  Timothy Hegarty

  Hi Jared, It appears that the pk-pk voltage injection amplitude is too high. Check the RC values from SW to VOUT as these set the ripple amplitude coupled to FB. It should be ~50mV (not more than 200mV at max Vin).The COT architecture regulates at the…

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

• RE: LM25085-Q1: LM25085-Q1

  

  Timothy Hegarty

  Hi Elvis, Please check your values using the LM251085 quickstart calculator: https://www.ti.com/tool/LM25085-5085QUICK-CALC . Check the inductor ripple current, could be current limit engaging if the issue is occuring above a certain load current. The…

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

• RE: LM25085: Weird behavior at high temps

  

  Timothy Hegarty

  Resolved

  Another thing to check is the inductor - when operating at hot, the sat current reduces and it may enter saturation and engage current limit (set at 5.8A). Consider changing the inductor to a shielded design. Also, 2.2uH seems very low for a 3A design…

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

• RE: WEBENCH® Tools/LM25085: mosfet power loss calculation

  

  Iven Su

  Hi, You can use its quick start tool to calculate the loss: www.ti.com/.../lm25085-5085quick-calc

  • over 3 years ago
  • Power management
  • Power management forum
Answered

• RE: WEBENCH® Tools/LM5085: Issues with high current at the output, suspected overcurrent protection

  

  Timothy Hegarty

  Resolved

  Hi Riccardo, Please send the layout for review. The traces from the current sense resistor should be short and direct to avoid noise pickup. Also, I recommend completing the LM5085 quickstart calculator for you design. Here is the link: http://www.ti…

  • over 3 years ago
  • Power management
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• RE: LM5085: Output voltage and current drops after some time

  

  Tadeusz Tatery

  Hi Tim, If "quickstart file" is also called "LM(2)5085 Quick Start Calculator" then it should be available here: www.ti.com/.../lm25085-5085quick-calc However, this site is almost empty for me - nothing to download. Regards Tade…

  • over 4 years ago
  • Power management
  • Power management forum

• RE: LM25085: Buck converter increase voltage on light load.

  

  Katelyn Wiggenhorn

  Hello, Have you used the Quickstart calculator? I recommend starting by using the Quickstart calculator in the product folder: www.ti.com/.../lm25085-5085quick-calc This calculator will help provide initial recommendations to designing a stable system…

  • over 4 years ago
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