LW020F87

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DC DC Converters

DC-DC converters are used to convert a DC voltage from one level to another. The most common types of DC-DC converters are inverters and buck-boost converters. The primary purpose of these converters is to reduce or increase the input voltage level to a desired level for use in a variety of applications. This article will discuss the application field and working principle of the LW020F87 DC-DC converter.

Application Field

The LW020F87 DC-DC converter has an input voltage range of 2.7 - 18 Volts, and its output voltage can be adjusted from 0.6 to 16 Volts. It can handle up to 20 Amps of current and has a high efficiency of up to 96%. This makes it suitable for a variety of applications, such as powering radio equipment, mobile phones, and LED lighting, and for industrial and automotive applications. It can also be used in step-down or step-up applications. Additionally, the LW020F87 DC-DC converter has a built-in temperature protection that shuts the device down if the temperature exceeds a certain limit, preventing damage to the device and ensuring safety.

Working Principle

The working principle of the LW020F87 DC-DC converter is based on the switching of polarization of the output inductor when the load current changes. The device oscillates between two states of inductor polarization. In the first state, the input voltage is converted into current and distributed among the transistors of the converter, and in the second state, the current is redistributed among the transistors and multiplied at the output. This process is repeated as long as there is a load current flowing through the converter.

The output voltage of the converter is stabilized by adjusting the duty cycle of the output transistors. This is done by operating the converter with pulse width modulation (PWM). The duty cycle is adjusted by taking the inputs from the output feedback pins and adjusting the duty cycle accordingly. As the output voltage increases or decreases, the duty cycle is adjusted accordingly to maintain a stable output voltage.

The internal circuitry of the LW020F87 DC-DC converter includes an oscillator, power transistors, current sensing circuits, and an over-temperature protection circuit. The oscillator is responsible for generating pulses for the PWM process. The power transistors are responsible for switching the current in the primary circuit. The current sensing circuit is used to regulate the output current, and the over-temperature protection circuit is responsible for protecting the circuit from damage should the temperature exceed a certain threshold.

Conclusion

The LW020F87 DC-DC converter is a versatile device that is suitable for a variety of applications. It has an input voltage range of 2.7 - 18 Volts, and an output voltage range of 0.6 to 16 Volts. It is capable of handling up to 20 Amps of current and has a high efficiency of up to 96%. It is controlled by a pulse width modulation system that adjusts the duty cycle of the output transistors according to the inputs received from the output feedback pins and maintains the output voltage at the desired level. The main components of the device are an oscillator, power transistors, current sensing circuits, and an over-temperature protection circuit.

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