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PT4821C DC DC Converters Application Field and Working Principle

DC DC converters are electrical appliances that convert DC power from one voltage level to another voltage level. They are widely used in industrial and domestic applications, providing an economical and efficient way to power electronic devices. PT4821C is a family of tiny DC DC converters specifically designed for low-power applications. This article will discuss PT4821C’s application field, working principle, and other related features.

Application Fields of PT4821C

PT4821C is a series of low power DC DC converters designed to provide power for small electronic devices such as cell phones, smart meters, industrial controls, and medical applications. The PT4821C family consists of two models that are ideal for these applications. The first model is the PT4821C-V-QR, which is capable of operating from a wide input voltage range of 4V to 10V, and offers up to 1 W of output power. The second model, the PT4821C-V-QF/Y, offers a higher power output of up to 2 W and supports an input voltage range of 6V to 14V. Both models also feature pin-to-pin compatibility, low idle current, and low temperature operation.

The PT4821C converters are built using advanced monolithic synchronous rectification technology and switching frequency of 500kHz, which provides higher efficiency compared to traditional step-down DC-DC converters. The integrated differential amplifier and shutdown control feature also provides faster transient response and better line regulation. The PT4821C converters are designed to operate in the temperature range of -40°C to +105°C and are housed in a standard SOT-23-6 package for excellent thermal performance.

Working Principle of PT4821C

The PT4821C consists of two main sections: an integrated synchronous rectifier and a control circuit. The integrated synchronous rectifier is responsible for accepting the input voltage from the power source and converting it to the desired output voltage. The control circuit is responsible for providing the necessary signal to the integrated synchronous rectifier to control the output voltage and current. The PT4821C has a built-in differential amplifier that senses the input voltage and the output voltage. When the input voltage changes, the control circuit adjusts the duty cycle of the switching transistor, which controls the output voltage.

The PT4821C also features a Shutdown Control pin (SHDN) that allows users to shut down the converter. When this pin receives a low logic signal, the converter is disabled and the output voltage is reduced to 0V. Finally, the PT4821C has a Soft-Start feature that allows the user to smoothly start up the converter after it has been enabled and the output voltage has reached its set operating level.

Performance Features of PT4821C

The PT4821C converters offer excellent performance features that make them ideal for low-power applications. The high efficiency of the converters can reach up to 92%. The low idle current of 80 μA makes them suitable for battery-powered applications. The high switching frequency of 500kHz allows for a small size and low external component count. The built-in overvoltage protection and undervoltage lockout features provide excellent protection for the device and the load circuit. The built-in thermal protection also ensures safe operation even under high temperature conditions.

Conclusion

PT4821C is a low-power DC DC converter, ideal for small electronic devices, such as cell phones, smart meters, and industrial controls. It has a wide input voltage range, high efficiency, low idle current, high switching frequency, and overvoltage protection and undervoltage lockout to ensure safe operation. This article discussed PT4821C\'s application field, working principle, and related features.

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