MIC38C44AYMM

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MIC38C44AYMM is a complete regulator system developed by Texas Instruments. It is capable to convert AC mains to regulated DC outputs and includes a full bridge rectifier, filter capacitor, PWM controller and gate driver. The device is designed with an input voltage range of 85V-265V predictable and can provide up to 8A output current with protected output. It features cycle-by-cycle primary current limitation, internal soft start function, over-temperature and under-voltage lockout protections and a high efficiency EMI filter.

The device is classified as a PMIC - AC DC Converters, Offline Switchers. It is designed for end equipment applications with low AC/DC cost and compact footprint. The device is cost effective choice for mains operated AC/DC supply for IT market and BMS/PMS. It is particularly suitable for applications in the field of IT, telecom and datacom.

The working principle of the MIC38C44AYMM IC is based on a high frequency resonant topology. The input AC voltage is rectified by a bridge rectifier and output by a PWM controlled switch. A low pass EMI filter is needed after the rectifier for EMI compliance. The core of the regulator is a PWM controller and a gate driver. The PWM controller converts an error signal between the measured output voltage and the required(set) voltage into a pulse width modulated output signal. The gate driver controls the power switch which determines the cycle-by-cycle, frequency and amplitude of the output waveform. The cycle-by-cycle primary current limitation will turn off the power switches when the peak current exceeds the limit. An Internal Soft Start will limit the initial inrush current and provide system stability.

The MIC38C44AYMM features various protection functions including over-temperature protection, output overvoltage protection, output undervoltage protection, input under/over voltage protection, gate drive UVLO and mode dead time protection for reliable operation. The device offers excellent line and load regulation, low EMI without the need of an external filter and active power factor and harmonic correction.

In summary, the MIC38C44AYMM is a low cost, high performance complete AC-DC regulator system. The device is suitable for applications in the field of IT, telecom and datacom. It has a wide input voltage range and high efficiency. The device is capable of cycle-by-cycle current limiting, over-temperature protection, output overvoltage protection, output undervoltage protection, input under/over voltage protection, gate drive UVLO and mode dead time protection. The MIC38C44AYMM IC is a cost effective solution for AC-DC supply in IT market and BMS/PMS.

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