Series:	SMARTMOS®
Packaging:	Tube
Part Status:	Obsolete
Mode:	Critical Conduction (CRM)
Frequency - Switching:	--
Current - Startup:	50µA
Voltage - Supply:	12 V ~ 25 V
Operating Temperature:	-20°C ~ 85°C
Mounting Type:	Surface Mount
Package / Case:	8-SOIC (0.154", 3.90mm Width)
Supplier Device Package:	8-SOIC
Base Part Number:	MC33232

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MC33232DG Application Field and Working Principle

Introduction to PMIC - PFC (Power Factor Correction)

Power Factor Correction (PFC) is an important part of any power system, especially modular power systems. PFC has been heavily adopted over the last decade and is now a familiar concept to many power engineers. This article provides an overview of the application fields and working principles behind the MC33232DG PFC controller.

Application Fields for PFC

PFC is used to convert AC power into DC power with improved system efficiency, reducing harmonic distortion and improving the power factor of the power system. MC33232DG is a highly-integrated PFC controller with a variety of integrated safety, current-sense, and control features. It is ideal for development of power supplies up to 400W and is suitable for small server, gaming notebook, and other high power PC peripherals.

MC33232DG Features and Benefits

MC33232DG is focused on increasing long-term reliability and reducing system costs. It includes a unique power-saving feature that reduces quiescent current to minimize power consumption. Additionally, several intelligent control modes allow the user to set up the desired control strategy and transition mode to optimize noise and performance.

MC33232DG Working Principle

The MC33232DG typically follows a PFC boost converter topology, with a voltage feedback loop and a current-mode control loop. The current mode control loop measures the current flowing in the inductor using a current sensor, and compares this measured inductor current with an internal reference. Once the difference between the two values reaches an error threshold, the PFC controller adjusts the duty cycle to compensate for the difference. This results in an output with a power factor close to 1, providing higher power efficiency and harmonic content that meets international standards. The adaptive current-mode control also reduces current overshoot and helps keep the average output power constant.The MC33232DG also offers single-rail soft-start function. The soft-start can be configured to start with the minimum duty cycle or maximum duty cycle at a rate determined by the user-set current slope, which helps reduce inrush current and reduce AC line stress during the startup phase. The MC33232DG also includes current limiting and over voltage protection, which helps protect the system from abnormal operation due to overloads.

Conclusion

Power Factor Correction is essential for any power system, and MC33232DG is a great example of a PFC controller that combines the necessary features and benefits for a stable, reliable system. Its current-mode control and soft-start feature increases overall system performance, reduces power consumption and noise, and meets international standard. The MC33232DG is suitable for many types of application fields, ranging from small server and gaming notebook to high power PC peripherals.

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