QHW050A71

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DC DC Converters

DC-DC converters are electronic devices used to change or regulate a voltage from one level to another by stepping up or stepping down the input level. Talkbox QHW050A71 is a basic, low cost DC-DC converter designed for telecommunications, computing and embedded systems applications. It can deliver a regulated output voltage of up to 10W/5V with no additional components.

Applications

With a wide input voltage range of 4.5-18V, the QHW050A71 is suitable for the power requirements of mobile digital devices like mobile phones, portable media players, digital cameras, digital camcorders and other embedded systems. This device has been primarily designed for low voltage regulated applications such as MP3 players, digital cameras, cell phones, and other embedded systems.

The QHW050A71 can also be used in applications such as :

• DC/DC buck and boost regulator
• Portable computer systems
• Bulk power supplies such as laptop AC adapters
• Battery powered systems
• High current switching

Working Principle

The QHW050A71 is a buck-boost type of DC-DC converter with synchronous rectification that offers excellent efficiency over a wide range of input and output voltages. The buck-boost type of converter combines the features of the buck and the boost converter in one integrated circuit. The input voltage can be above or below the output voltage, thus eliminating the need for additional components.

Unlike other DC-DC converters, QHW050A71 uses special synchronous rectification technique, which ensures high efficiency at all times. The synchronous rectifier senses the output voltage and turns itself off when the output voltage reaches or exceeds a reference voltage set by an external resistor. This improves the dynamic response of the device and frequency stability because the switching deactivation depends on the output voltage and not on the dead time fixed in the drive of the switch.

At the same time, the synchronous rectifier improves the device’s efficiency, which is especially useful in low voltage applications, and is suitable for applications such as battery-powered electronics. This is made possible by the fact that the synchronous rectifier turns off only when the output voltage exceeds an external reference voltage, thus drawing minimal power and providing efficient conversion.

The QHW050A71 can also be used in high-frequency switching applications since it has an adjustable switching frequency up to 2MHz. This allows for more efficient operation since it eliminates the need for external inductors and capacitors, allowing the converter to adapt to a wide range of input and output voltages and current levels.

Overall, the QHW050A71 provides an ideal solution for applications that require a small form factor. It is capable of providing a low voltage regulated output at up to 10W/5V with no additional components. With an adjustable switching frequency up to 2MHz, it is suitable for applications like battery-powered electronics, bulk power supplies, and high current switching applications.

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