Overview
The FAN6248HDMX is an advanced synchronous rectifier (SR) controller designed by ON Semiconductor. It is optimized for LLC (Inductor-Inductor-Capacitor) resonant converter topology, requiring minimal external components. This controller is specifically tailored for high-efficiency power supplies, particularly in desktop and server power supplies, networking and telecom power supplies, and high-power LED lighting applications. The FAN6248HDMX features two independent gate driver stages for driving SR MOSFETs, each with its own sensing inputs, ensuring stable SR operation across the entire load range.
Key Specifications
| Parameter | Min | Max | Unit | |
|---|---|---|---|---|
| VDD (Power Supply Input Pin Voltage) | -0.3 | 30 | V | |
| VDD_ON (Turn-On Threshold) | 4.2 | 4.5 | 4.7 | V |
| VDD_OFF (Turn-Off Threshold) | 4.0 | 4.2 | 4.4 | V |
| fMAX (Maximum Switching Frequency) | 700 kHz | |||
| fMIN (Minimum Switching Frequency) | 25 kHz | |||
| PD (Power Dissipation at TA = 25°C) | 0.625 W | |||
| TJ (Junction Temperature) | -40°C | 125°C | ||
| VGATE_MAX (Gate Clamping Voltage) | 12 V | |||
| ISOURCE (Peak Source Current for Turning On) | 0.7 A | |||
| ISINK (Peak Sink Current for Turning Off) | 1.4 A |
Key Features
- Advanced Synchronous Rectification: Optimized for LLC resonant converter topology with adaptive parasitic inductance compensation to minimize body diode conduction and maximize efficiency.
- Dual Gate Driver Stages: Independent gate driver stages for driving SR MOSFETs, each with its own sensing inputs.
- Adaptive Dead Time Control: Adjusts internal offset voltage to compensate for dead time variations, ensuring stable SR operation.
- Light Load Detection: Detects light load conditions and adjusts the modulation current to maintain stable operation.
- Green Mode Operation: Disables SR operation at very light load conditions to minimize operating current.
- High Efficiency: Suitable for high-efficiency desktop and server power supplies, networking and telecom power supplies, and high-power LED lighting.
Applications
- High-Efficiency Desktop and Server Power Supplies: Ideal for reducing power losses and improving overall system efficiency.
- Networking and Telecom Power Supplies: Enhances the reliability and efficiency of power supplies in networking and telecom equipment.
- High Power LED Lighting: Optimizes the performance of high-power LED lighting systems by ensuring efficient power conversion.
Q & A
- What is the primary function of the FAN6248HDMX?
The FAN6248HDMX is an advanced synchronous rectifier (SR) controller designed for LLC resonant converter topology, optimizing efficiency and minimizing external components.
- What are the key features of the FAN6248HDMX?
Key features include dual gate driver stages, adaptive parasitic inductance compensation, adaptive dead time control, light load detection, and green mode operation.
- What is the maximum switching frequency of the FAN6248HDMX?
The maximum switching frequency is 700 kHz.
- What is the minimum switching frequency of the FAN6248HDMX?
The minimum switching frequency is 25 kHz.
- How does the FAN6248HDMX handle light load conditions?
The FAN6248HDMX detects light load conditions and adjusts the modulation current to maintain stable operation. It also enters green mode to minimize operating current at very light loads.
- What are the typical applications of the FAN6248HDMX?
Typical applications include high-efficiency desktop and server power supplies, networking and telecom power supplies, and high-power LED lighting.
- What is the package type of the FAN6248HDMX?
The FAN6248HDMX is available in an SOIC-8 package.
- What is the junction temperature range of the FAN6248HDMX?
The junction temperature range is from -40°C to 125°C.
- How does the FAN6248HDMX ensure stable SR operation?
The FAN6248HDMX ensures stable SR operation through its advanced control algorithm, adaptive dead time control, and turn-on blocking time to prevent cross conduction.
- What is the power dissipation of the FAN6248HDMX at 25°C?
The power dissipation is 0.625 W at 25°C.
