MIC38HC44-1BM

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Power management circuits serve a variety of purposes in different applications. They are responsible for controlling the power supplied to the load and ensuring system stability. The MIC38HC44-1BM is a highly integrated power management integrated circuit that can serve various applications and offers functionality ranging from pulse width modulation to error-detection and current limit functions. It is a part of Microchip’s family of Smart Power for 380VAC Offline Switchers and AC-DC converters. This article will go over the application fields and working principle of the MIC38HC44-1BM.

Application Fields

The MIC38HC44-1BM is designed for off-line ac-dc and 380V AC offline switchers. It is ideal for a wide range of lighting, HVAC and audio-visual applications. It can also be used for industrial and consumer applications.

The MIC38HC44-1BM provides many protection features and fault diagnostics such as:

• Under voltage lockout
• Over-voltage protection
• Under temperature lockouts
• Over temperature protection
• Short circuit protection
• Current limit protection
• PIPOT Fault Conditions

These features help improve the reliability and stability of the system, as well as troubleshooting during system maintenance and repair.

Working Principle

The MIC38HC44-1BM is based on the concept of quasi-resonant topology, a type of converter that uses two or more transformers or inductors to control power flow. It offers better efficiency and power density than traditional topologies but at the cost of a more complex design. This is addressed partially by the integrated circuit, which offers an optimized power delivery system. The circuit can be controlled either by an internal clock or by an external signal.

The objective of the design of the MIC38HC44-1BM is to provide efficient output power with lowest noise possible. The circuit includes two main channels, each providing precise power. The primary side channel consists of a quasi-resonant type oscillator and a PWM controller. On the secondary side, the power is provided by a full-bridge rectifier with a pulse-width modulator.

The primary side of the circuit controls the power switch, which is responsible for regulating the output. This power switch is driven by a quasi-resonant type oscillator, which adjusts the switching frequency of the power switch to provide efficient output power. At the same time, the PWM controller sets the duty cycle of the power switch, ensuring that the output power is maintained to the desired level.

The frequency of the oscillator can be adjusted by adding an external clock or by adjusting the frequency jumper on the circuit. The full-bridge rectifier on the secondary side is responsible for transforming the ac waveform into a DC waveform. This is done by the pulse-width modulator, which adjusts the duty cycle of the waveform and helps regulate the output power.

The MIC38HC44-1BM circuit is designed with input and output protection and a dedicated temperature protection circuit. The input protection ensures that the circuit does not receive power surges above its rated levels. The output protection ensures that the output power is not allowed over its rated levels. The temperature protection helps prevent the circuit from overheating.

The MIC38HC44-1BM is a versatile and compact circuit designed for a wide range of applications. It offers high efficiency, protection features, and programmability for optimized performance. It is a cost-effective solution for lighting, HVAC, and audio-visual applications, as well as industrial and consumer applications.

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