TL 431 Shunt Regulator. Design Note 11

TL 431 is an Adjustable Precision Zener Shunt regulator that can be used to get a desired output voltage from a power supply. It’s output voltage can be set to any value between 2.5 volts and 36 volts using a voltage divider comprising two resistors. It can be used to design, Battery Monitors, Battery chargers etc. Along with two resistors, TL431 give a regulated precise output voltage. Here we discuss how TL431 is used to make a Battery monitor for Solar powered Inverter and a 5 volt power supply.
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TL431 Shunt Regulator switch. Design Trick 4

One simple way to protect circuits from over voltage is the use of a Shunt Regulator IC TL431 to switch off the load if the voltage increases above the preset level. In unregulated power supply, if the voltage in the primary of the step down transformer increases, a corresponding increase in voltage will appears in the secondary also. This may seriously affect the circuit, if it uses voltage sensitive semiconductors.TL431 is an adjustable precision Zener shut regulator and its output voltage can be set between 2.5 volts to 36 volts using a voltage divider. It can functions like a Zener diode but with precision.
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