High-Performance Quasi-Resonant PWM Controller: onsemi FAN6605MX for Efficient Power Supply Designs
In the evolving landscape of power electronics, achieving high efficiency, reduced electromagnetic interference (EMI), and reliable performance in switch-mode power supplies (SMPS) remains a critical design challenge. The onsemi FAN6605MX stands out as a high-performance quasi-resonant (QR) pulse-width modulation (PWM) controller engineered to address these demands, making it an ideal choice for advanced power supply applications.
The FAN6605MX integrates quasi-resonant switching technology, which enables operation in valley switching mode. This approach significantly reduces switching losses by turning on the power MOSFET when the drain-source voltage is at its minimum (valley), thereby enhancing overall efficiency. This is particularly beneficial in applications requiring high efficiency across varying load conditions, such as adapters, LED drivers, and auxiliary power supplies for industrial systems.
A key feature of this controller is its built-in active burst mode operation, which optimizes performance at light loads. By reducing the switching frequency during low-load conditions, it minimizes standby power consumption, helping power supplies meet stringent energy efficiency standards like ENERGY STAR and EU CoC regulations.
The device also incorporates comprehensive protection features to ensure system reliability. These include over-voltage protection (OVP), over-load protection (OLP), and over-temperature protection (OTP), safeguarding both the controller and the external power components under fault conditions. Additionally, its built-in frequency jittering function effectively reduces EMI, simplifying filter design and compliance with regulatory standards.
With a startup current of just 5 µA and operating current of 3 mA, the FAN6605MX excels in low-power applications. Its wide VDD operating range (up to 30V) and high-voltage startup circuit further enhance flexibility and robustness in diverse power architectures.
The onsemi FAN6605MX QR PWM controller combines high efficiency, robust protection, and low EMI in a compact package, making it a superior solution for modern power supply designs that demand reliability and performance.
Keywords:
Quasi-Resonant Controller
PWM Controller
High Efficiency
Low EMI
Power Supply Design
