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  sateesh talisetty1

  • 2 months ago
  • Power management
  • Power management forum

  UCC28720: UCC28720 and current sense resistor damaged

  TI Thinks Resolved

  Part Number: UCC28720 Hi, We are using UCC28720 as per attached image below. In few of the power supplies, we found Parts R91, R92 ( Current Sense resistors), U1 ( Switcher) , T1 ( Transistor connected to the switcher drive) and R2 ( Transistor Base...
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  Lin_Charles

  • 2 months ago
  • Power management
  • Power management forum

  RE: UCC28600: 800VAC application discussion

  Hi Mike, Thank you for your recommendation here. For the UCC28720, the HV max input voltage is 700V, how to use 800VAC in this application? Thanks. BR, Charles Lin
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  Rafael del Rey

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

  UCC28720: The power supply output voltage is good with no load, but drops the voltage when loaded

  TI Thinks Resolved

  Part Number: UCC28720 Hello, I copied the reference design inside UCC28720 datasheet, including same part numbers for discrete. The design gives the expected output with no load connected, and when a 10 ohm load is added the voltage drops to zero...
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  Benjamin Lough

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

  RE: Hi Voltage Regulator

  Hi Bastiaan, thanks for your interest in TI. This paper is not an exact match for a bipolar flyback design but you may find it useful: www.ti.com/.../slup261.pdf. Also take a look at UCC28720 which can be used in a flyback bipolar design. The design...
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  Ulrich Goerke

  • 11 months ago
  • Power management
  • Power management forum

  RE: UCC28740: Ucc28740 stops every 2ms

  Hi User5327551, The UCC28720 controller is possible, since it does not have the dither function, however it works with primary-side regulation (PSR) which uses the reflected output voltage on the auxiliary winding to regulate. So it will not have as...
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  Sanyogita Thakur

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

  UCC28720: Can we design?

  TI Thinks Resolved

  Part Number: UCC28720 Can we design 5V, 0.5A isolated power supply module with this IC? If i try with TI Webench it shows that junction temperature lower than ambient temperature. Please advise.
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  Mike O'

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

  RE: UCC28722: how to find and select an industrial grade IC?

  Hello Ras, The UCC28722 drives IGBTs and is better suited for extremely high voltages and would work for your application. However, the UCC28701 is designed to drive FETs and will also work for your application. They both use trickle charge startup...
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  Ulrich Goerke

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

  RE: UCC28742: VS maximum ratings

  Hi Armela, The negative zener clamp method you cited from section 7.3.1.3 is illustrated in this reference design schematic: http://www.ti.com/lit/df/slurax2/slurax2.pdf which was done for a project using the UCC28720 PSR BJT-controller, however the...
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  Ulrich Goerke

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

  RE: UCC28910: Operating voltage range

  Hello Eric, Thank you for your consideration of the UCC28910 flyback controller with integrated switching MOSFET. The maximum rating for the integrated MOSFET is 700V. For your Products 2 and 3, the input line of 277Vac represents a maximum rectified...
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  Scott Allred19

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

  RE: UCC28720 Design not working!

  Bernard, I found a transistor, Diodes Incorporated ZTX458, with hfe of 100. Now, what happens is the fuseable resistor R9 fails open. It happens relatively slowly - 20 or 30 seconds? Enough for me to see that saw-tooth wave on VDD but not long enough...

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