SLVS543P August 2004 – November 2018 TL431 , TL432
PRODUCTION DATA.
In the configuration shown in Figure 25 TL431 will behave as a comparator, comparing the VREF pin voltage to the internal virtual reference voltage. When provided a proper cathode current (IK), TL43xx will have enough open loop gain to provide a quick response. This can be seen in Figure 26, where the RSUP=10 kΩ (IKA=500 µA) situation responds much slower than RSUP=1 kΩ (IKA=5 mA). With the TL43xx's max Operating Current (IMIN) being 1 mA, operation below that could result in low gain, leading to a slow response.