Overview
The FAN6240M6X is a secondary-side synchronous rectifier (SR) controller designed for isolated flyback converters operating in Discontinuous Conduction Mode (DCM). This controller is part of the product lineup from Fairchild Semiconductor, now integrated into ON Semiconductor. It is optimized for high-efficiency power conversion and is particularly suited for applications requiring precise control over the synchronous rectifier (SR) MOSFET.
The device features an adaptive dead-time control algorithm that minimizes the body diode conduction of the SR MOSFET, ensuring stable and robust operation against noise and circuit parasitic disturbances. It also includes turn-on and turn-off trigger blanking times for improved noise immunity and supports high-frequency applications up to 200 kHz.
Key Specifications
| Parameter | Min. | Typ. | Max. | Unit |
|---|---|---|---|---|
| VIN Power Supply Input Pin Voltage | -0.3 | 30 | V | |
| VDD Internal Regulator Output Pin Voltage | -0.3 | 6.5 | V | |
| VDRAIN Drain Sense Input Pin Voltage | -1 | 100 | V | |
| VGATE Gate Drive Output Pin Voltage | -0.3 | 6.5 | V | |
| VSOURCE Source Sense Input Pin Voltage | -1 | 1 | V | |
| Operating Junction Temperature (TJ) | -40 | 150 | °C | |
| Storage Temperature Range (TSTG) | -60 | 150 | °C | |
| Turn-On Delay (TON.DLY) | 20 | ns | ||
| Turn-Off Delay (TOFF.DLY) | 20 | ns | ||
| Internal LDO Output Voltage (VDD) | 5.00 | 5.25 | 5.50 | V |
| Output Voltage Low (VOL) | 0.25 | V | ||
| Output Voltage High (VOH) | 5.0 | V | ||
| Rise Time (tR) | 10 | ns | ||
| Fall Time (tF) | 10 | ns |
Key Features
- Works in Discontinuous Conduction Mode (DCM)
- Adaptive Turn-off Trigger Blanking Time for easier use
- Turn-on Trigger Blanking Time (Minimum-OFF Time) for Improved Noise Immunity
- Supports High-Frequency Applications up to 200 kHz
- Minimum Turn-on Delay (20 ns)
- Adaptive Turn-off Threshold Control for Minimized SR MOSFET Body Diode Conduction
- Wide Voltage Range for LDO Input up to 30 V
- Small Footprint: SOT-23 6 Pin Package
- Low VDD Under-Voltage Lockout (UVLO) voltage
- SR Skipping Mode to reduce power consumption during low load conditions
Applications
- Battery Chargers for Smart Phones, Feature Phones, and Tablet PCs
- AC-DC Adapters for Portable Devices that Require CV/CC Control
Q & A
- What is the primary function of the FAN6240M6X?
The FAN6240M6X is a secondary-side synchronous rectifier (SR) controller for isolated flyback converters operating in Discontinuous Conduction Mode (DCM).
- What is the operating temperature range of the FAN6240M6X?
The operating temperature range is from -40°C to +125°C.
- What is the maximum input voltage for the VIN pin?
The maximum input voltage for the VIN pin is 30 V.
- What is the typical output voltage of the internal LDO?
The typical output voltage of the internal LDO is 5.25 V.
- What is the purpose of the adaptive dead-time control algorithm?
The adaptive dead-time control algorithm minimizes the body diode conduction of the SR MOSFET, ensuring stable and robust operation against noise and circuit parasitic disturbances.
- What is the maximum frequency supported by the FAN6240M6X?
The FAN6240M6X supports high-frequency applications up to 200 kHz.
- What is the turn-on delay of the FAN6240M6X?
The turn-on delay is 20 ns.
- What package type is the FAN6240M6X available in?
The FAN6240M6X is available in a SOT-23 6 Pin package.
- What are some common applications for the FAN6240M6X?
Common applications include battery chargers for smart phones, feature phones, and tablet PCs, as well as AC-DC adapters for portable devices requiring CV/CC control.
- Does the FAN6240M6X have any power-saving features?
Yes, it has an SR Skipping Mode to reduce power consumption during low load conditions.
