MIC38HC44-1BM-TR

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PMIC - AC DC Converters, Offline Switchers

The MIC38HC44-1BM-TR is an integrated chip developed by Microchip Technology Inc. It is an offline switcher that converts an AC input voltage to an isolated DC output voltage. The MIC38HC44-1BM-TR can support a wide range of input voltages ranging from 90VAC to 265VAC, making it suitable for a variety of applications, such as datacenter, industrial and solar energy systems.

The chip is provided with a built-in active PFC pre-regulator and full-bridge synchronous rectifier providing one isolated DC output. The high-level of integration of MIC38HC44-1BM-TR reduces system cost, size and components count. The MIC38HC44-1BM-TR appliance also features line under-voltage lockout, an auto-restart function, and shield mode operation.

Working Principle of MIC38HC44-1BM-TR

The operating principle of the MIC38HC44-1BM-TR is relatively simple. The input AC voltage is rectified and converted to an unregulated DC voltage. This voltage is then connected to an active input PFC pre-regulating stage, which adjusts to the normal mains voltage, overvoltage and undervoltage conditions.

In the pre-regulating stage, a secondary PFC series regulator is used to limit the output current of the pre-regulator to its rated current. This prevents the pre-regulator from going into overload when the system draws high current.

The pre-regulated DC voltage then passes to the high-frequency, full-bridge synchronous rectifier stage, providing one isolated output. The rectified DC output is then smoothed and regulated, using an integrated Switcher-Mode Power Supply (SMPS) controller. The SMPS controller regulates the output voltage of the synchronous rectifier stage to within a tolerated range by controlling the pulse width modulation (PWM) of the synchronous rectifier.

Application of MIC38HC44-1BM-TR

The MIC38HC44-1BM-TR can be used in a wide range of applications, such as datacenters, factories, and renewable energy systems. It is suitable for applications that require an isolated DC output voltage, such as DC-to-DC converters and power supplies. The chip\'s wide input voltage range makes it an ideal choice for applications in places with unstable or unreliable mains voltage.

The MIC38HC44-1BM-TR is also suitable for applications that require accurate output voltage regulation. The integrated SMPS controller ensures that the output voltage is within a specified tolerance, eliminating the need for external voltage control circuitry.

Conclusion

The MIC38HC44-1BM-TR is an integrated offline switcher from Microchip Technology Inc. that provides one isolated DC output from an AC input voltage. Its wide input voltage range and integrated SMPS controller make it an ideal solution for applications that require an isolated DC voltage, such as DC-to-DC converters, power supplies and renewable energy systems.

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