UCC381DPTR-3

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The UCC381DPTR-3 is a linear voltage regulator from Texas Instruments. Specifically, it is part of their “UCC38 Series of DC-to-DC voltage regulators” and comes in a TO-220 package for carrying out its task. The linear application field of the UCC381DPTR-3 makes it suitable for a range of applications including battery operated systems, telecommunication power supplies, automotive electronics, processes control systems, and point-of-load converters. Its main purpose is to provide a stable voltage from an unstable power source in a consistent, cost-efficient way.

Working Principle

At a base level, the UCC381DPTR-3 uses IC (integrated circuit) technology to convert an unstable power source into a stable voltage. This is achieved by using the regulator’s voltage feedback loop to ensure that the output voltage remains consistent despite changes in the input voltage. The voltage feedback loop works like this:

• The input voltage passes through an error amplifier, where any difference between the input and output voltage is detected.
• A switching transistor is used to control the current flowing through the output, thus controlling the output voltage to match the input voltage.
• The transistor is driven by a current source whose magnitude is determined by the outputs of the error amplifier.

Furthermore, the regulator also incorporates over-temperature and over-current protection to prevent damage to itself and the power source.

Features

The UCC381DPTR-3 was specifically designed with high-dynamic load currents and low supply current capabilities. To achieve this, it has an integrated power switch and a secondary supply voltage, capable of providing 4A of switch current on a 4V supply.

This power switch design ensures low dropout (<1.1V) and a low quiescent current consumption (<2mA). Furthermore, the UCC381DPTR-3 has a wide operating temperature range (-40°C to +125°C) and has a maximum output voltage of 36V.

Conclusion

The UCC381DPTR-3 linear voltage regulator offers a reliable and efficient method of regulating an unstable power source. Its wide operating temperature range, low dropout and low quiescent current consumption make it ideal for a range of applications, from telecommunication power supplies to automotive electronics. Its feature set, combined with its short-circuit and over-temperature protection, makes the UCC381DPTR-3 an excellent choice for voltage regulation in your application.

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