• 

  John Griffin1

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

  RE: UCC2808A-1: In soft start，Change UCC2808A Pin 1(COMP) PWM from 0% to 50%，The expected comp voltage is from 0V to 5V.

  Hi Tony, Sorry we do not have this information in a reference design. I will close this post since I think there is no further information available. Please open a new post if you need any further help. Regards John
• 

  John Griffin1

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

  RE: TL494: Successor Product

  Hi Kato-san, You can consider using the UCC28C44 or the UCC2808A, family of parts. http://www.ti.com/lit/ds/symlink/ucc28c45.pdf https://www.ti.com/lit/ds/symlink/ucc2808a-1.pdf Regards John
• 

  Peter Meaney

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

  RE: Forward PWM Controller solution

  Hi James, Vin is very low at 9V the input current will be something like 55A or higher to allow for power dissipation through the power stage. Most customers use push-pull topology for higher powers in this voltage range. UCC2808A is an option,...
• 

  Paul Kim

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

  UCC2808A-1: about sensing resistor for current limit

  TI Thinks Resolved

  Part Number: UCC2808A-1 Hi Team for UCC2808A, calulating the proper sensing resistor is by { TYP overcurrent threshold[V] / OverCurrent[A] = 0.75V / OverCurrent[A] } ?
• 

  Hirotsugu Kobayashi

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

  UCC2808A-1: UCC2808A Wide Input Range

  • Resolved

  Part Number: UCC2808A - 1 Is it possible to achieve a circuit of Fig.2 of ucc2808 data seat
• 

  John Griffin1

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

  RE: LM5030: LM5030 push pull step up

  Hello Watchaphong, You could use the LM5030 for such an application however 100kHz is below the minimum operating oscillator frequency of the ic. You should consider using the UCC2808A-1 or the UCC2808A-2 which is another push pull controller and...
• 

  Douglas Mitchell92

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

  RE: SG3524: Having issues achieving max PWM

  Hi John, Thanks for the valuable info. We purchased some UCC2808A-1 chips and it made a great improvement. It still looks like the waveform is a bit asymetrical (looks like about .2 usec at 200khz) but it could be my imagination. Is there anyway to make...
• 

  John Bottrill

  • over 9 years ago
  • Power management
  • Power management forum

  Re: UCC2808A-1 - Unregulated PushPull

  Arc, There is a DC offset on the current sense lead and a resistor divider between the COMP voltage and the current comparator. The current comparator sets the duty cycle so even if the voltage at the COMP were to be set it would not set the maximum...
• 

  CHOI SEUNG WON

  • 10 months ago
  • Power management
  • Power management forum

  UCC2808-2: Wrong information in UCC2808 PDF?

  TI Thinks Resolved

  Part Number: UCC2808-2 Dear TI I think ucc2808a pdf has a wrong information in table 1. Second line , UCCx808A-1 --> UCCx808A-2?? Best regards Choi
• 

  Rafeeq MUHAMMED

  • 4 months ago
  • Power management
  • Power management forum

  RE: UCC28950: UNABLE TO use design tool for spec. SLUC222D (PSFB) ( UCC28950 Excel design Tool),

  Dear Colin, thank you for reply, 1) what is "Transformer inductance" & "Inductance" marked RED color (my earlier screenshot) ? 2) Can you give a quick comparison about UCC2808A & LM5033 which is more suitable for me ...

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