JAJSHO6F March 2005 – July 2019 TL431-Q1 , TL432-Q1
PRODUCTION DATA.
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In the configuration shown in Figure 26 the TL43x-Q1 behaves as a comparator, comparing the REF pin voltage to the internal virtual reference voltage. When provided a proper cathode current (IKA), the TL43x-Q1 has enough open loop gain to provide a quick response. This is shown in Figure 27, where the RSUP = 10 kΩ (IKA = 500 µA) situation responds much slower than RSUP = 1 kΩ (IKA = 5 mA). With the TL43x-Q1's maximum operating current (IMIN) being 1 mA, operation below that could result in low gain, leading to a slow response.