LM22670EVAL/NOPB

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LM22670EVAL/NOPB Overview

The LM22670EVAL/NOPB Evaluation Board from Texas Instruments is a low power, low cost, SMPS evaluation board specifically designed around the LM22670 Synchronous Buck DC/DC Converter. It provides an easy and efficient way to evaluate the performance of the LM22670 switch-mode power supply (SMPS) when being used as a constant-voltage (CV) or constant-current (CC) converter, and also serves to familiarize the user with the LM22670\'s power savings, footprints, and many features and benefits that make it a valuable choice for the power supply and other DC/DC converter applications, even in low voltage environments (such as single-cell battery rail applications).

Applications

The LM22670EVAL/NOPB is well-suited for a variety of DC/DC converter applications, such as powering 3D printers, drones, and other hobbyist projects. It is also suitable for use in a wide range of industries, such as networking, industrial/automated systems, telecommunications, lighting, instrumentation, medical, automotive, consumer electronics, and many others. The LM22670EVAL/NOPB performs well with step-up voltages ranging from 1.2V to 6V, and step-down voltages from 3.3V to 12V. It can handle a peak current target of 10A while providing a low output ripple and designed for a wide temperature range from -40°C to +125°C.

Features and Benefits

The LM22670EVAL/NOPB Evaluation Board provides users with several features and benefits, such as adjustable switching frequency, programmable over-current protection, and a large input voltage range. The board supports an adjustable PWM frequency with values ranging from 300kHz to 2MHz. It also offers a programmable over-current protection through the use of external sense resistors. Its input voltage range covers from 2.7V to 6V, which is suitable for single-cell battery rail applications. The board also features high efficiency (up to 95%), low standby current, low quiescent current, simple design, no-load enable, and low EMI emissions. Lastly, it comes with a typical external components list, which allows for a fast and simple implementation.

Working Principle

The LM22670EVAL/NOPB Evaluation Board provides a working principle which employs a DC/DC, or buck, switching converter. The Buck Converter consists of a switching transistor and an inductor, both connected to a fixed supply voltage. At every cycle, the switch is turned on all the way from 0-100%, thus allowing the inductor to store energy. When the switch is turned off, the inductor releases the energy it has stored, thus producing a voltage drop (or, for step-up applications, an increased voltage). This voltage drop (or increase) is regulated through a feedback loop. The controller inside the switch measures the output voltage, compares it to a reference voltage, and adjusts the pulse width of the switch as needed to maintain its desired output. This buck circuit is appropriately sized for each specific application.

Conclusion

The LM22670EVAL/NOPB Evaluation Board from Texas Instruments is an excellent tool for evaluating the performance of the LM22670 Synchronous Buck DC/DC Converter. It features a low power, low cost, SMPS design, and numerous features and benefits that make it highly suitable for a variety of DC/DC converter applications. The LM22670EVAL/NOPB evaluation board utilizes a buck switching converter architecture, which is appropriately sized for each application, and precise voltage control is ensured via a feedback loop. In conclusion, the LM22670EVAL/NOPB Evaluation Board from Texas Instruments provides users with a reliable and efficient solution for power supply and other DC/DC converter applications.

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