EMB1499QMHE/NOPB

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EMB1499QMHE/NOPB Application Field and Working Principle

Introduction

The EMB1499QMHE/NOPB is a special purpose voltage regulator from Texas Instruments. It is part of their performance line of power management integrated circuits (PMICs) intended for a wide variety of commercial, industrial, and automotive applications. This product family includes devices offering a variety of voltage regulation configurations, including positive or negative linear regulators, standard buck switching regulators, and boost regulators.

The EMB1499QMHE/NOPB is a high voltage buck regulator specifically designed to convert high voltages down to a more usable level. The device is ideal for applications where the input voltage is higher than the output voltage, and the output current is expected to be moderate.

Features

The EMB1499QMHE/NOPB is designed to operate in a variety of conditions, offering excellent performance in the following areas:

• It provides the highest voltage accuracy of any device in its class, with a guaranteed accuracy of ±1% across an input voltage range of 2.7– 24 V.
• The EMB1499QMHE/NOPB can provide high output current (up to 1.2 A) and support very low output voltage (< 0.8 V).
• The device is capable of a wide range of power-saving functions and is rated for temperatures up to the full industrial range (–40 °C to 125 °C).
• The device supports an adjustable soft-start function that can be used to limit inrush current and ensure a smooth start-up process.
• The EMB1499QMHE/NOPB is highly integrated and features onboard thermal protection, short-circuit protection, and over-load protection.

Applications

The EMB1499QMHE/NOPB voltage regulator is designed for applications requiring high voltage step down, such as battery-powered systems, automotive systems, power supplies, and automotive starters. As mentioned, the device also provides a wide range of power-saving functions. Some applications may also benefit from the adjustable soft-start feature, which can be used to limit inrush current and ensure a smooth start-up process.

Working Principle

The EMB1499QMHE/NOPB voltage regulator uses a buck topology with a high-frequency switching scheme to convert the input voltage to the desired output voltage. The device switches at a controlled frequency and the output voltage is regulated by controlling the duty cycle of the switching waveforms. The EMB1499QMHE/NOPB features a wide input voltage range and can support output currents up to 1.2 A.

The device is designed to operate at high frequency, allowing for smaller and more efficient components, as well as faster response times. The device includes a switching transistor which is turned on and off at a set frequency (determined by an external resistor), which allows for precise control of the output voltage.

The device also includes several protection features to ensure safe operation in the event of a fault. The onboard current limit circuit monitors output current and will limit the output current if the load attempts to pull more current than the device can handle. Additionally, the device includes an over-temperature protection circuit, which will shut down the device if the junction temperature exceeds a set threshold.

Conclusion

The EMB1499QMHE/NOPB high voltage buck regulator from Texas Instruments offers a wide range of features to enhance the performance and reliability of voltage regulation applications. The device offers excellent voltage accuracy and can handle a wide range of input and output voltages. The device is well suited for applications requiring high voltage conversion, including battery-powered systems, automotive systems, power supplies, and automotive starters. Additionally, the device offers a variety of protection and power-saving features, making it a reliable and cost-effective solution for a variety of voltage regulation applications.

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