UCC3895 PDF

This device extremely low quiescent current which is typically 1. Dropout voltage is also very low, typically less than mV at the maximum output current of mA. The AAT has output short circuit and over. Reverse Voltage to Volts Forward Current - 1.

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We take the example of the popular TL device and try to understand its use in electronic circuits through a few of its application notes. Electrical Specifications Technically the device TL is called a programmable shunt regulator, in simple terms it may be understood as an adjustable zener diode. Sink current handling capacity up to maximum mA Unlike normal zeners, noise generation is negligible.

How the IC TL works? The TL is a three pin transistor like such as BC adjustable or programmable voltage regulator. The output voltage can be dimensioned using just two resistors across the specified pin outs of the device. The diagram below shows the internal block diagram of the device and also the pin out designations. The following diagram indicates the pin outs of the actual device. Circuit Examples using TL The circuit below shows how the above device TL can be used as a typical shunt regulator.

The above figure shows how with the help of just a couple of resistors the TL can be wired up as a shunt regulator for generating outputs between 2. R1 is a variable resistor which is used for adjusting the output voltage. The 0. The output from the 78XX IC is connected with the potential divider network which determines the output voltage.

The parts can be identified through the formula shown in the diagram. The above configurations are restricted to a max mA current at the output. For getting higher current a transistor buffer may be used, as shown in the following circuit. In the above diagram most of the parts placement is similar to the first shunt regulator design, except that here the cathode is provided with a resistor to positive and the point also becomes the base trigger of the connected buffer transistor.

The output current will depend on the magnitude of current the transistor is able to sink. In the above diagram we can see two resistors whose values are not mentioned, one in series with the input supply line, another at the base of the PNP transistor. The resistor at the input side limits the maximum tolerable current that can be sinked or shunted by the PNP transistor.

This can be calculated in the same way as discussed previously for the first TL regulator diagram. This resistor protects the transistor from burning due to short circuit at the output.

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