Part Number: FAN6604MRMX

Manufacturer: onsemi


Shipped from: Shenzhen/HK Warehouse

Stock Available: Check with us

Technical Specifications of FAN6604MRMX

Datasheet  FAN6604MRMX datasheet
Category Integrated Circuits (ICs)
Family PMIC – AC DC Converters, Offline Switchers
Manufacturer Fairchild Semiconductor
Packaging Tape & Reel (TR)
Part Status Active
Output Isolation Isolated
Internal Switch(s) No
Voltage – Breakdown
Topology Flyback
Voltage – Start Up 17V
Voltage – Supply (Vcc/Vdd) 10 V ~ 24 V
Duty Cycle 82.5%
Frequency – Switching 65kHz
Power (Watts)
Fault Protection Current Limiting, Open Loop, Over Temperature, Over Voltage, Short Circuit
Control Features
Operating Temperature -40°C ~ 105°C (TA)
Package / Case 8-SOIC (0.154″, 3.90mm Width)
Supplier Device Package 8-SOIC
Mounting Type Surface Mount


The FAN6604MRMX PWM controller is a highly integrated solution designed to optimize the performance of flyback converters. This comprehensive guide aims to provide a detailed overview of the FAN6604MRMX, its features, benefits, and applications, along with guidelines for utilizing this controller effectively.

Overview of FAN6604MRMX

The FAN6604MRMX is a PWM controller that incorporates various features to enhance the performance of flyback converters. It offers advanced functions such as Green-Mode operation for standby power reduction, burst mode for zero-load and light-load conditions, frequency hopping for reduced EMI emissions, and synchronized slope compensation for stable peak-current control. Additionally, it provides comprehensive protection functions to ensure reliable operation.

Features and Benefits of the FAN6604MRMX

Standby Power Reduction

  • The FAN6604MRMX incorporates Green-Mode operation, which minimizes standby power consumption.
  • By modulating the off-time and continuously decreasing the switching frequency under light-load conditions, it reduces power usage during standby, leading to energy savings and increased efficiency.
  • Compliance with energy-saving regulations ensures environmentally-friendly designs and improved power efficiency.

Power Conservation under Light-Load Conditions

  • The FAN6604MRMX utilizes Burst Mode when operating under zero-load and very light-load conditions.
  • By saving PWM pulses in “deep” Burst Mode, it further reduces power consumption and enhances overall energy efficiency.
  • The ability to conserve power during low-load conditions helps meet international power conservation requirements and reduces operational costs.

Reduced EMI Emissions

  • The FAN6604MRMX integrates a frequency-hopping function to minimize electromagnetic interference (EMI) emissions.
  • By reducing EMI, it helps ensure compliance with electromagnetic compatibility (EMC) standards without the need for additional line filters.
  • Improved EMI performance contributes to the overall reliability and performance of the power supply.

Stable Peak-Current Control

  • The FAN6604MRMX features synchronized slope compensation, which helps achieve stable peak-current control in flyback converters.
  • Synchronized slope compensation ensures precise control over output power, enhancing overall power conversion efficiency and reducing output voltage variations.
  • Stable peak-current control results in improved system reliability and performance.

Comprehensive Protection Functions

  • The FAN6604MRMX includes various protection functions to safeguard the power supply and connected components.
  • Protection features such as AC input brownout protection with hysteresis, sense pin short-circuit protection, and VDD over-voltage protection ensure system reliability and protect against potential faults or failures.
  • By providing comprehensive protection, the FAN6604MRMX enhances the safety and longevity of the power supply and helps prevent damage to critical components.

Overall, the FAN6604MRMX PWM controller offers a range of features and corresponding benefits. Its capabilities include standby power reduction, power conservation under light-load conditions, reduced EMI emissions, stable peak-current control, and comprehensive protection functions. These features contribute to energy savings, improved power efficiency, compliance with regulations, reduced EMI interference, stable power delivery, and enhanced system reliability. By leveraging these features, engineers can design efficient and reliable power supply solutions for various applications.

Applications of the FAN6604MRMX

Power Adapters

  • The FAN6604MRMX is well-suited for power adapter applications used in laptops, mobile phones, and other electronic devices.
  • Its standby power reduction and power conservation features help achieve energy-efficient power adapters with minimal power consumption during standby and light-load conditions.
  • The controller’s comprehensive protection functions ensure reliable operation and protect the power adapter and connected devices.

LED Lighting

  • The FAN6604MRMX can be utilized in LED lighting applications such as bulbs, downlights, and LED strips.
  • Its reduced EMI emissions feature helps meet electromagnetic compatibility requirements for LED lighting, ensuring compliance with regulatory standards.
  • The stable peak-current control capability ensures consistent and reliable current regulation for optimal LED lighting performance.

Home Appliances

  • The FAN6604MRMX is suitable for various home appliances such as refrigerators, air conditioners, and washing machines.
  • Its standby power reduction feature helps minimize energy consumption during standby mode, contributing to energy-efficient and environmentally-friendly home appliances.
  • The comprehensive protection functions ensure safe and reliable operation of the home appliances, protecting against voltage fluctuations and potential faults.

Consumer Electronics

  • The FAN6604MRMX can be used in consumer electronic devices such as televisions, audio systems, and gaming consoles.
  • Its power conservation features under light-load conditions help achieve energy-efficient operation and comply with energy-saving regulations.
  • The stable peak-current control capability ensures stable and reliable power delivery, enhancing the performance and longevity of consumer electronic devices.

Industrial Power Supplies

  • The FAN6604MRMX is suitable for industrial power supply applications, including factory automation equipment, motor drives, and control systems.
  • Its reduced EMI emissions feature helps meet strict electromagnetic compatibility requirements in industrial environments, ensuring reliable operation and compliance with industrial standards.
  • The comprehensive protection functions provide robust protection against voltage fluctuations, short circuits, and over-voltage conditions, ensuring the durability and reliability of industrial power supplies.

These examples highlight the versatility of the FAN6604MRMX PWM controller across different applications. Its features and benefits, including power efficiency, EMI reduction, stable current regulation, and comprehensive protection functions, make it a suitable choice for power adapters, LED lighting, home appliances, consumer electronics, and industrial power supplies. By utilizing the FAN6604MRMX, engineers can design efficient, reliable, and compliant power solutions for a variety of applications.

Design Guidelines

  • When utilizing the FAN6604MRMX in flyback converter designs, consider the following guidelines for optimal performance and reliability:
  • Green-Mode Operation: Enable the Green-Mode function to minimize standby power consumption and comply with energy-saving regulations.
  • Burst Mode: Ensure the controller enters Burst Mode under zero-load and light-load conditions to further reduce power consumption.
  • Frequency Hopping: Activate the frequency-hopping function to reduce EMI emissions and enhance electromagnetic compatibility.
  • Synchronized Slope Compensation: Adjust the slope compensation settings for stable peak-current control and efficient power conversion.
  • Protection Functions: Utilize the AC input brownout protection, sense pin short-circuit protection, and VDD over-voltage protection to ensure system reliability and component protection.


In conclusion, the FAN6604MRMX PWM controller offers a range of features and benefits for power supply designs. With its standby power reduction, power conservation under light-load conditions, reduced EMI emissions, stable peak-current control, and comprehensive protection functions, it provides advantages such as energy efficiency, compliance with standards, and reliable operation. Following the design guidelines ensures optimal performance and reliability.

To acquire the FAN6604MRMX PWM controller, contact ICRFQ, your leading electronic component distributor in China. ICRFQ offers a wide range of electronic components and ensures that you receive the highest quality products at affordable prices. Get in touch with ICRFQ to source the FAN6604MRMX and bring enhanced performance and reliability to your power supply designs.

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Kevin Chen