THN 20-4811WI

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DC-DC converters are electronic circuits used to convert a source of direct current (DC) from one voltage level to another. They are used to power devices that require a current source with a specific voltage level that is different from the available DC source. In the context of this article, we will be discussing the application field and working principle of the THN20-4811WI.

Application Field

The THN20-4811WI is a type of enclosed single output DC–DC converter and is uniquely designed to be used in space-constrained applications with high efficiency and low noise. It is commonly used in industrial, medical and telecom applications. Specifically, it is used to support a variety of high frequency point of load applications and is ideal for regulating output voltage in digital circuits. This converter can deliver a maximum power of 28W with an ultra-high power density of 8W/in3.

Working Principle

The working principle of the THN20-4811WI DC–DC converter is based on a pair of switching MOSFETs that are used to increase the input voltage to a higher output voltage. These MOSFETs are driven by a pulse-width modulation (PWM) control circuit, which helps to regulate the voltage and current at its output. The converter operates using an isolated flyback topology to minimize the radiated EMI and to avoid leakage current at input.

When the MOSFETs are turned on, the inductor will store energy into the magnetic field. This energy will be released when the MOSFETs are turned off. The current will flow in the opposite direction, creating a voltage spike on the inductor. The energy stored in the inductor will be transferred to the output via a diode. The PWM controller will adjust the duty cycle to increase or decrease the output voltage, based on the load current and desired output voltage level.

The THN20-4811WI has a wide operating temperature range, from -40°C to +90°C, and it has an industry-standard package size of 17.8x26.7x8.1 mm³. This feature makes it suitable for many industrial and board-level applications. The converter also has an active standby function and synchronization for multiple supplies. It also provides adjustable input UVLO and output over-voltage protection functions.

Conclusion

In conclusion, the THN20-4811WI is a DC-DC converter that is designed for space-constrained applications and for use in various industrial, medical and telecom applications. Its wide operating temperature range and wide package size makes it suitable for many applications. Its working principle is based on a pair of switching MOSFETs that are used to increase the input voltage to a desired output voltage, which is regulated by aPWM control circuit.

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