MIC38C44ABMM

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The MIC38C44ABMM is an efficient, wide input voltage range, easily programmable, current-slope-limited PWM controller for AC/DC switching applications. It works with readily available IGBT, MOSFET, bipolar, and self-driven switching circuits. Achieving low standby power, yet high power efficiency and accuracy, the MIC38C44ABMM helps to lower system cost.

Application Field: The MIC38C44ABMM integrates a number of features that make it attractive for many AC/DC switching applications, including offline switchers such as switch mode power supplies (SMPS), high voltage flyback converters, high voltage forward converters, motor drives, and solar panel inverters. It offers a wide range of features such as:

• IEC-61000-4-2 ESD making it suitable for high-voltage environments;
• High efficiency up to 98% for a Flyback converter;
• Wide input voltage range: 25V-500V;
• Programmable gate drive voltage;
• Programmable current-slope-limited ramp generator;
• Low on-time protection;
• High peak current capability;
• Output short-circuit protection;
• Undervoltage protection;
• Selectable Direct PWM, Complementary PWM or PFM modes of operation;
• Overload output current protection;
• Over-temperature protection.

Working Principle:The MIC38C44ABMM is a current-slope-limited current-mode PWM control chip. It is designed to control switch mode power supplies (SMPS) using IGBT, MOSFET, bipolar, or self-driven switching circuits. The chip use current mode control with the output voltage feedback making it ideal for applications requiring high precision in controlling the output voltage.

The MIC38C44ABMM uses either direct PWM, complementary PWM, or pulse frequency modulation (PFM) control to achieve fast load and line responses. When in PWM mode, the controller can drive the external power switches at a fixed frequency of up to 100 kHz. The PWM duty cycle is varied to control the output power.

In current-slope-limited PWM mode, the controller restricts the current in its power switches. This minimizes the electromagnetic interference (EMI) and allows the use of lower cost MOSFETs or IGBTs, while still delivering the required power. This mode also limits the amount of overshoot or ringing in the output voltage.

The MIC38C44ABMM is designed to be used in nonisolated flyback, forward converters, and independent DC/DC converters. The input voltage range of the MIC38C44ABMM is 25V-500V, making it suitable for wide range of applications. The chip also incorporates a slew-rate controlled current-limit function to provide protection from output overloads. A selectable under-voltage lockout (UVLO) set-point feature prevents the output switching until after the input voltage rises above its threshold.

The MIC38C44ABMM features adjustable frequency foldback, allowing adjustment and programming of the operating frequency when the load is below the threshold and enters the foldback region. This reduces system EMI, allowing for higher power efficiency and better EMI performance.

The MIC38C44ABMM also incorporates an adjustable on-time protection circuit to ensure the output switch is never on for too long. This gives additional assurance that components do not fail due to excessive switching time.

Overall, the MIC38C44ABMM is an efficient, wide input voltage range, easily programmable, current-slope-limited PWM controller for AC/DC switching applications with a low standby power, yet high power efficiency and accuracy. It is suitable for offline switchers such as switch mode power supplies (SMPS), high voltage flyback converters, high voltage forward converters, motor drives, and solar panel inverters.

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