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MIC2178-3.3YWM-TR Application Field and Working Principle

The MIC2178-3.3YWM-TR is a positive voltage regulator for DC/DC power supplies, produced by Micrel Inc. It is part of the company\'s MIC2178 family of low-dropout (LDO) regulators that offers very high accuracy and wide range of output voltages.

The MIC2178-3.3YWM-TR is designed primarily to regulate the output voltage of a DC/DC switching regulator. It uses a dual loop architecture that allows it to remain in regulation regardless of load current and transient conditions. The device also has a low temperature coefficient, high stability, and an adjustable current limit.

The MIC2178-3.3YWM-TR can provide up to 1.8A of continuous output current and up to 3.0A of peak current. It has a high accuracy of typically 0.2 percent and a very low output voltage tolerance of 0.4 percent. It also provides robust protection against overvoltage and reverse current.

The application field of the MIC2178-3.3YWM-TR is significant. For example, it can be used in automotive, home electronics, and industrial equipment as a voltage regulator. It is ideal for applications requiring high-accuracy and low temperature operation, such as in instrumentation, or for powering motors or solenoids in industrial environments.

Working Principle

The MIC2178-3.3YWM-TR operates according to the dual loop architecture, which is a combination of the line compensation and error feedback loops. The line compensation loop compensates the voltage output of the regulator by sensing the output voltage at the load, while the error feedback loop senses the output voltage and compensates it through the internal compensation circuitry.

The device is activated when its enable pin is pulled high (above 1V). When the enable pin is pulled low, the device is put into a low-power standby mode. The enable pin can also be used to set the filter response time.

The MIC2178-3.3YWM-TR includes a power MOSFET which acts as a switch for the power supply. The power MOSFET is regulated by the control circuitry, which adjusts its on/off state to ensure that the output voltage remains relatively constant. The power MOSFET also acts as an electronic fuse to protect the device from transient events such as power surges from the power source.

The MIC2178-3.3YWM-TR includes several protection features to ensure safe operation of the device. It has overcurrent, short circuit, overvoltage, and reverse current protection, as well as thermal shutdown. If a fault condition occurs, the device shuts down the output until the fault is cleared. Also, the device can be thermally protected by its own thermal sensing circuitry, which will limit the operating temperature to prevent damage to the device.

Conclusion

The MIC2178-3.3YWM-TR is part of the MIC2178 family and is a low-dropout, high-accuracy positive voltage regulator for DC/DC power supplies. It operates according to the dual loop architecture and offers reliable protection against overvoltage and reverse current. The device is ideal for applications requiring accurate output and low temperature operation, such as automotive, home electronics, and industrial equipment.

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