FM4MFA1007M

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FM4MFA1007M is a high voltage full bridgeswitchmode power supply module used primarily forhigh power (~7kW), low-output voltage (~250V) systems.It has full features, reliability, and safety, and is widely used in industrial, military, and communications equipment.FM4MFA1007M is an integrated power supply module that integrates all the necessary elements of a full bridge switchmode power supply, including a high voltage input rectifier circuit, an input voltage feedback circuit, a power factor correction circuit, a half-bridge output stage, a soft-start circuit, a bridge current feedback circuit, and a fault protection circuit.

The FM4MFA1007M application field includes:

• Digital and analog high end industrial and communication products;
• High-end medical imaging and imaging products;
• Lighting, industrial automation, instrumentation, industrial automation, security, defense, communications, and telecommunications fields.

The working principle of FM4MFA1007M is as follows:

• A high voltage input rectifier circuit is first used to convert AC input voltage into DC voltage;
• A power factor correction circuit is then used to improve the power factor of the input supply;
• A half-bridge output stage is then used to convert the input power into the desired output voltage;
• The output voltage feedback circuit is then used to regulate the output voltage;
• The bridge current feedback circuit is then used to stabilize the output current;
• A soft-start circuit is used to reduce inrush current;
• The fault protection circuit is then used to protect the entire system.

The output voltage of a typical switched power supply is closely related to the input voltage, and it is a common problem in power supplies to introduce considerable ripple at the output. To reduce the ripple, several methods can be used. One approach is to use a low-pass filter on the output of the power supply, but this allows only limited ripple reduction. Therefore FM4MFA1007M uses a more intricate technique, utilizing feedback between the output voltage and the switching signal on the output stage. This technique is more reliable than the simple filter approach. The feedback signal is supplied by a voltage feedback circuit, which keeps the output voltage more precisely within the desired range.

The principle of soft-start is to limit the inrush current which occurs when the power supply is turned on. To achieve this, an increase of the output voltage starts slowly after the power supply is turned on. This is accomplished by a circuit that generates a low start voltage of 30/Q and then ramps it up in a linear manner. This feature ensures that the output voltage increases gradually when the power supply is turned on.

FM4MFA1007M uses a bridge current feedback circuit to control the output current. The feedback signal is supplied by a current sense resistor R3 which is placed in series with the load. The bridge current feedback circuit then controls the switching signal of the output stages to maintain a steady current into the load, so that the load is always supplied with the current it needs.

The fault protection circuit is used to protect the entire system. It monitors the voltage and current of the input supply, the output, and the temperature of the module. If any of these parameters exceeds the specified limits, the output is disabled and the fault LED is illuminated. This ensures that the system is protected from over-current, over-voltage, and thermal overload.

FM4MFA1007M is a high voltage switchmode power supply module. It offers full features, has high reliability, and provides a high level of safety. It is used in a wide range of applications, from digital and analog high end industrial and communication products to high-end medical imaging, lighting, and instrumentation. Its features, such as a power factor correction circuit, a half-bridge output stage, a soft-start circuit, a bridge current feedback circuit, and a fault protection circuit, ensure that it is able to deliver power safely and reliably.

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