• State
  • Locked Locked
  • Replies 1 reply
  • Subscribers 63 subscribers
  • Views 716 views
  • Users 0 members are here
Support feedback
Options
Options
Related

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

Internal R of Comp pin for UCC28C44

John Stevens
Expert 7395 points
Other Parts Discussed in Thread: UCC28C44

Team,

using optocoupler feedback tied directly to COMP with FB grounded as seen in Figure 4 of UCC28C44 Datasheet.

What is the value of R in the system block diagram for COMP pin?

Regards,

John

  • 0
    TI__Genius 15910 points
    The specific resistors in question are maintained at a 2:1 ratio, their specific values aren’t critical in the application.
    The E/A output (COMP) is forced to its high state by FB being tied to GND. COMP will source typically 1mA –it will have no problem driving the internal resistance.
    The opto must overcome the source current capability to control the COMP pin below the Error Amplifier High-level output voltage (VOH)