MIC38C45-1YM-TR

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MIC38C45-1YM-TR Application Field and Working Principle

The MIC38C45-1YM-TR is a non-synchronous pulse width modulation (PWM) current-mode controller designed for off-line and dc-to-dc converter applications requiring up to 500 Watts of output power. It is housed in a 16-pin SOIC package and is suitable for operating temperatures of 0°C to +125°C.

The MIC38C45-1YM-TR is part of the MIC38Cxx family of current-mode PWM controllers, enabling multiple output performance by supplying an additional high voltage auxiliary output supplementing the main output. Its features include operating frequency up to 800 kHz and precise reference current limit circuitry with programmable current limit from 5 mA to 25 mA.

The MIC38C45-1YM-TR belongs to the family of DC-DC Switching Controllers, which can be classified into three main categories - switching regulators, linear regulators, and voltage-mode controllers. Switching regulators are highly efficient, isolated voltage converters that use transistors to open and close a circuit. This kind of operation is also known as pulse width modulation (PWM) and provides precise control of output voltage, frequency and load. It’s ideal for designs where power dissipation and cost is critical.

Application Field

The MIC38C45-1YM-TR is a PWM controller that can be used in a variety of applications requiring precise voltage regulation. It is suitable for applications such as servers, telecom platforms, storage and embedded systems, industrial PCs, and power modules.

The MIC38C45-1YM-TR can also be used in Off-Line Switched Mode Power Supplies (SMPS). These are power supplies utilized in many applications that require galvanic isolation between input and output for protection, along with small size, high efficiency, low cost, and reliability. Such applications include lighting, industrial systems, domestic appliances, and automotive.

Working Principle

The MIC38C45-1YM-TR follows current-mode control and utilizes pulse-width modulation to accurately regulate output voltage and current. Current-mode control means that the controller will compare the output voltage levels to a reference current. The BAS pin supplies power to the internal regulator that feeds a voltage reference to the current sensing circuit and to the reference terminal. By setting the current limit with a resistive divider between the reference pin and the CS pin, the MCU will regulate the output while precisely controlling the current in the primary stage.

The MIC38C45-1YM-TR is a highly integrated device that incorporates a wide variety of features to ensure excellent performance. It utilizes a self-biased driver stage to reduce component count and it supports a wide input voltage range from 9V to 50V for optimization of system design. It also features a soft-start pin to provide a period of slow rise or fall in current during the start-up condition, which can be controlled by the soft-start capacitor connected to the SS pin. Additionally, it supports reliable protection features such as input voltage undervoltage lockout, output overvoltage protection, and thermal arrest.

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