TPS79147DBVT

TPS79147DBVT Application Field and Working Principle

The TPS79147DBVT is a low-drop, 2A voltage regulator from Texas Instruments, which belongs to the family of daisy-chainable, low-dropout linear (LDO) regulators. Incorporating excellent performance and many advanced protection features, the TPS79147DBVT is a high-end, efficient and versatile LDO solution, suitable for many different applications.

The TPS79147DBVT is a 0.53V LDO regulator. It offers a 3.1V–17V input voltage range and adjustable output voltage between 0.8V–14V. It is available in a 10-pin PowerPAD™ package configuration. Its typical dropout voltage is 0.2V at 2A load, making it the perfect choice for applications that require low dropout voltage. Its output current is adjustable between 0–10A (which is programmable using a resistor divider). It also features an adjustable output voltage accuracy of ±2.5%, which makes it suitable for applications where higher precision is necessary. Furthermore, it features a low quiescent current of 1.5mA, with a low ground current of 1.2A at full load, and a fast transient response with a startup time of 500µs.

Now let’s look at the TPS79147DBVT’s working principle. There are two main blocks in the circuit: the regulator and the protective circuits. The regulator block is the most important part of the circuit and it is responsible for regulating the output voltage. It consists of the input pin, the series pass devices (M1 M2 in the schematic), the compensation capacitor Cc, the feedback resistor Rfb, and the Ground pin. The regulator block controls the output voltage by adjusting the gate of the pass device (M1 M2) in order to maintain a constant output voltage. This is done by adjusting the voltage on the input pin with the help of the feedback resistor.

The protective circuits are used to protect the device from overload, overvoltage, thermal stress, and reverse-battery conditions. The protections include: overload, overvoltage, undervoltage, overtemperature, and reverse-battery protection. It also includes short-circuit protection and current-limit protection. The short-circuit protection is done by two elements, the M3 transistor and the Rsc resistor. The current-limit protection is done by the current limiter circuit, which is composed of M1, M2, C2 resistor, and Rlimit resistor.

In conclusion, the TPS79147DBVT is a versatile, efficient and highly advanced linear voltage regulator. It provides excellent performance, low dropout voltage, adjustable output, low quiescent current, low ground current, and fast transient response. It also features a wide range of protections and adjustable output voltage accuracy of ±2.5%. All these features make it a perfect choice for many different applications.