TLV431BH6TA

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Voltage references are essential components within a power management circuit system. Among them, the TLV431BH6TA is a very common 3-terminal adjustable shunt voltage regulator released by Texas Instruments. It can work in many applications, such as over-current protection, over-voltage protection, current limit protection, no-load, protection and adjustable precision current settings.

TLV431BH6TA Application Field

As a standard 3-terminal precision adjustable shunt voltage regulator, the TLV431BH6TA can fit for many applications. It can be used in AC/DC adapter/charger, medical device applications, instrumentation and communication system, data acquisition systems, laptop PCs, and other electronic products.

Firstly, in AC/DC adapter/charger applications, the TLV431BH6TA can be used as over-current protection. Usually, when an AC/DC adapter is in overload, the TLV431BH6TA can detect it and automatically cut off the current. It also has the features of over-voltage protection. When the output voltage of an AC/DC adapter is over the rated value, it can also be detected by the device and the current will be cut off.

Secondly, it can be seen in medical device applications. This device can be used as current limit protection. When medical devices, such as portable medical device or home medical device, like the heartbeat monitors, are in power failure, the TLV431BH6TA can limit the current output and protect the device from exploding or damage.

Additionally, the TLV431BH6TA provides implacable and adjustable precision current settings. For many instruments and communication systems, it can control the output voltage very precisely. It can also provide constant current output in no-load condition.

TLV431BH6TA Working Principle

The TLV431BH6TA is a GoggleLTAG™ precision adjustable shunt voltage regulator with a 2.5V reference voltage, with a wide adjustable output voltage range of 1.25V to 36V. It is applied with bipolar-technology. Inside the device, it contains a precision band-gap reference with a 2.5V output voltage and a Z-FET pass transistor. The 2.5V reference can be connected to the output or discharge port to obtain better stability. It is provided with very low temperature coefficient and excellent line and load regulation.

When powered, the TLV431BH6TA can provide a precise adjustable output voltage. For the adjustable output voltage, firstly, its regulating pin is internally connected to a low-noise band-gap reference. Then the current source of the 3-terminal shunt regulator will be set to obtain the precise output voltage. Secondly, the precision output voltage is regulated by the internal Z-FET pass transistor. As the Z-FET will remain off until the voltage of the reference and regulating pin exceeds a precise value. Thus, it will provide a precise and stable output voltage. Finally, after the output current increases, the internal Z-FET pass transistor will turn on gradually, allowing the current to pass through and keeping the output voltage stable.

Conclusion

By using bipolar-technology, the TLV431BH6TA is a 3-terminal adjustable shunt voltage regulator released by Texas Instruments. It can be used in AC/DC adapter/charger, medical device applications, instrumentation and communication system, data acquisition systems, laptop PCs and other electronic products. It will provide a precise and adjustable output voltage with excellent line and load regulation, low temperature coefficient and precise current settings. With its features, it is widely used in many applications nowadays.

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