ac431 chip is a parallel voltage regulator integrated circuit.
Because of its good performance and low price, it is widely used in various power supplies. The package form is the same as the plastic-sealed triode 9013
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The main parameters of TL431 are:
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1. The maximum input voltage is 37V.
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2. Maximum working current 150mA.
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3. Internal reference voltage is 2.5V.
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4. Output voltage range is 2.5~30V.
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The TL431 is equivalent to a voltage regulator diode