Overview
The FAN6224M, produced by onsemi, is a secondary-side Synchronous Rectification (SR) controller designed to drive SR MOSFETs for enhanced efficiency in power conversion systems. This IC is particularly suited for flyback converters and forward freewheeling rectification. It operates in Continuous Conduction Mode (CCM), Discontinuous Conduction Mode (DCM), and Quasi-Resonant (QR) flyback converters using a proprietary linear-predict timing-control technique. This technique simplifies the control method by eliminating the need for current-sense circuitry, thereby improving noise immunity.
Key Specifications
| Attribute | Value |
|---|---|
| Maximum Switching Frequency | 140 kHz |
| Output Voltage | 14 V |
| Number of Outputs | 1 |
| Mounting Type | Surface Mount |
| Package Type | SOP-8 |
| Pin Count | 8 |
| Dimensions | 4.9 x 3.9 x 1.575mm |
| Minimum Operating Temperature | -40 °C |
| Maximum Operating Temperature | +105 °C |
| Maximum Operating Supply Voltage | 15 V |
| PWM Controller Type | Secondary Side Synchronous Rectifier |
Key Features
- mWSaver™ Technology: Internal Green Mode to stop SR switching for lower no-load power consumption, with an ultra-low operating current of 300 µA in Green Mode.
- Synchronous Rectification Controller suitable for high-side and low-side of flyback converters.
- PWM frequency tracking with secondary-side winding voltage detection, allowing operation in both fixed- and variable-frequency systems up to 140 kHz.
- VDD Pin Over-Voltage Protection (OVP), LPC Pin Open/Short Protection, RES Pin Open/Short Protection, RP Pin Open/Short Protection, and Internal Over-Temperature Protection (OTP).
- Adjustable Green Mode timing via the RP pin.
Applications
- AC-DC NB Adapters.
- Open-Frame SMPS (Switch Mode Power Supplies).
- AC-DC Merchant Power Supply for Desktop PCs, Servers & Workstations, and Portable Consumer Devices.
- Notebook PC power supplies.
Q & A
- What is the FAN6224M used for? The FAN6224M is used as a secondary-side Synchronous Rectification (SR) controller for flyback converters and forward freewheeling rectification.
- What are the operating modes of the FAN6224M? The FAN6224M operates in Continuous Conduction Mode (CCM), Discontinuous Conduction Mode (DCM), and Quasi-Resonant (QR) flyback converters.
- What is the maximum switching frequency of the FAN6224M? The maximum switching frequency is 140 kHz.
- What is the Green Mode feature in the FAN6224M? The Green Mode feature stops all SR switching operations to reduce operating current and power consumption at light-load conditions.
- What are the protection features of the FAN6224M? The FAN6224M includes VDD Pin Over-Voltage Protection (OVP), LPC Pin Open/Short Protection, RES Pin Open/Short Protection, RP Pin Open/Short Protection, and Internal Over-Temperature Protection (OTP).
- What is the package type and pin count of the FAN6224M? The FAN6224M comes in an SOP-8 package with 8 pins.
- What are the typical applications of the FAN6224M? Typical applications include AC-DC NB Adapters, Open-Frame SMPS, and power supplies for desktop PCs, servers, workstations, and portable consumer devices.
- What is the operating temperature range of the FAN6224M? The operating temperature range is from -40 °C to +105 °C.
- How does the FAN6224M detect output load conditions? The FAN6224M detects output load conditions and determines adjustable loading levels for Green Mode through the RES and LPC pins.
- Can the Green Mode timing be adjusted in the FAN6224M? Yes, the Green Mode timing can be adjusted via the external resistor connected to the RP pin.
