Author Topic: A problem about OPAmp and TL431  (Read 913 times)

0 Members and 1 Guest are viewing this topic.

Offline China NewBoyTopic starter

  • Regular Contributor
  • *
  • Posts: 54
  • Country: cn
A problem about OPAmp and TL431
« on: November 06, 2019, 11:06:58 am »
             How  the voltage between the 2.3 pin of TL431 will change(increase or drop?)   after the input of op amp A and op amp B increases?
 
   the opa A  and opa B are on the same chip
« Last Edit: November 06, 2019, 11:09:40 am by China NewBoy »
 

Online iMo

  • Super Contributor
  • ***
  • Posts: 5570
  • Country: va
Re: A problem about OPAmp and TL431
« Reply #1 on: November 06, 2019, 11:47:25 am »
If the voltage at the pin1 against pin2 (gnd) of the TL431 goes above 2.5V the voltage between its pins 3 and 2 drops from Vxyz to 2.5V.
In the schematics above there is a divider 147k/3k thus the voltage at pin 1 most probably never goes above 2.5V.
Readers discretion is advised..
 
The following users thanked this post: China NewBoy

Offline China NewBoyTopic starter

  • Regular Contributor
  • *
  • Posts: 54
  • Country: cn
Re: A problem about OPAmp and TL431
« Reply #2 on: November 06, 2019, 01:49:50 pm »
thanks,the problem is solved now..casued by my stupid mistake
 


Share me

Digg  Facebook  SlashDot  Delicious  Technorati  Twitter  Google  Yahoo
Smf