LM3020-9G

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AC-DC converters are electronic devices used to achieve efficient energy transformation from alternating current (AC) power to direct current (DC) power. This is done through rectifying AC current to DC current, as well as regulating the output voltage and current. The LM3020-9G is an AC-DC converter known for its high efficiency, wide temperature range and small size.

As a high-performance DC-DC converter, the LM3020-9G is suitable for applications such as communications, industrial automation equipment, medical monitoring, computer peripheral power, and many more. This converter takes 12V 300mA as the maximum input voltage, and provides a programmable current regulation range of 0-3A. With the features of fast operating speed, it is able to adjust the output current within a few microseconds.

The LM3020-9G features a voltage mode digital pulse width modulation (PWM) control structure, with built-in under-voltage protection, over-voltage protection, short circuit protection and overload protection. It uses a synchronous rectifier in its synchronous buck output converter to achieve high efficiency. The LM3020-9G works by taking in AC input voltage, and then the rectifier will convert it to a DC signal with its diode bridge. The DC voltage is then adjusted to a programmable output voltage via the PWM control.

The LM3020-9G also has its built-in digital voltage feedback loop control. This includes internal circuitry modifications such as a gain-setting resistor, an error correction amplifier, an integrator, or a gain adjustment for the inner loop. The voltage regulation loop is closed by comparing the voltage feedback signal to the reference voltage, and then compensating the voltage output accordingly. The output current is indirectly regulated by increasing or decreasing switching duty cycle of the PWM signal.

The LM3020-9G also provides accurate and stable output current limit protection. The output current of each channel is monitored via a pair of sense resistors, where a sensing voltage proportional to the output current is generated. This sensed voltage is then compared with the pre-determined voltage threshold, and an output current limit signal is generated when the output current reaches its predefined limit. The PWM signal’s duty cycle is then limited in order to decrease the output current to its desired level.

In summary, the LM3020-9G is a highly efficient and reliable DC-DC converter designed for a wide range of applications. It is suitable for use in power supplies, computers, communications, medical monitors, and other power circuits due to its low noise, high efficiency and wide temperature range. Its many features include an on-chip voltage regulator integrated circuit design that allows for precise voltage control, and an internal synchronous rectifier to provide high efficiency output. Moreover, its built-in fault protection, digital voltage feedback loop and accurate output current limit protection ensure superior performance and greater reliability.

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