SG3842M

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PMIC – AC DC Converters, Offline Switchers are used for providing solutions for many system loads. In this paper, an SG3842M offline switcher shall be discussed in detail with regards to its application fields and working principle.

The SG3842M is a monolithic two-channel offline switcher which provides an ideal solution for a wide range of AC/DC offline switch-mode power supply applications. This IC offers enhanced flexibility and efficiency, saving cost while being suitable for relatively low-power off-line applications. It is offered in a 7-pin dual in-line package (DIP) or a small surface mount package (SMD).

The SG3842M is a versatile IC which is suitable for many applications. Examples include LED lighting control, universal switch-mode power supplies, high frequency switching circuits, variable speed motors, high efficiency power converters, charging systems and other power conversion applications. It has a wide input voltage range of 4V to 18V and an output voltage range of 0.8V to 16V. At full load, it can provide a maximum of 1.2A output current.

The main features of the SG3842M include its high average efficiency and low current consumption. It is also capable of providing low start-up current, low cost solutions and very low standby consumption. To ensure overheating protection, the integrated thermal shutdown circuit reduces the power consumption of the chip when it gets too hot.

The SG3842M utilizes a PWM controlling system with a fixed frequency of about 110 kHz. Its frequency is also adjustable by an external resistor and capacitor on pin 4. The chip also contains a 2-mode protection system which is designed to protect the IC from short-circuits, overloads and undervoltage/overvoltage conditions.

The SG3842M is an ideal device for many power supply applications and its application field is vast. It also offers a wide range of features and benefits, from high efficiency and low current consumption to thermal shutdown protection. The SG3842M is a very versatile IC and its working principle makes it suitable for a wide range of power supply applications.

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