SNVSBA4A May 2019 – November 2019 TL431LI-Q1 , TL432LI-Q1
PRODUCTION DATA.
When the cathode/output voltage or current of TL43xLI-Q1 is being fed back to the reference/input pin in any form, this device is operating in closed loop. The majority of applications involving TL43xLI-Q1 use it in this manner to regulate a fixed voltage or current. The feedback enables this device to behave as an error amplifier, computing a portion of the output voltage and adjusting it to maintain the desired regulation. This is done by relating the output voltage back to the reference pin in a manner to make it equal to the internal reference voltage, which can be accomplished through resistive or direct feedback.