Overview
The FAN9673QX is a three-channel interleaved Continuous Conduction Mode (CCM) Power Factor Correction (PFC) controller IC produced by ON Semiconductor. This device is designed for PFC pre-regulators and is capable of implementing leading edge, average current, and boost-type power factor correction. The FAN9673QX enables the design of power supplies that fully comply with the IEC1000-3-2 specification. Its interleaved operation significantly reduces input and output ripple currents, making conducted EMI filtering easier and more cost-effective. The controller also features an innovative channel management function that allows smooth loading and unloading of slave channels in lower power-level conditions, improving the PFC converter’s load transient response.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| VDD (DC Supply Voltage) | - | - | 30 | V |
| VOPFC (Voltage on OPFC1, OPFC2, OPFC3 Pins) | -0.3 | - | VDD + 0.3 | V |
| Operating Junction Temperature (TJ) | -40 | - | 150 | °C |
| Storage Temperature Range (TSTG) | -55 | - | 150 | °C |
| Programmable Operation Frequency Range | 18 kHz | - | 40 kHz or 55 kHz - 75 kHz | kHz |
| Power Dissipation (PD), TA < 50 °C | - | - | 1640 | mW |
| Thermal Resistance (Junction-to-Air) | - | - | 77 | °C/W |
Key Features
- Continuous Conduction Mode Control
- Three-Channel PFC Control (Maximum)
- Average Current-Mode Control
- PFC Slave Channel Management Function
- Programmable Operation Frequency Range: 18 kHz ∼ 40 kHz or 55 kHz ∼ 75 kHz
- Programmable PFC Output Voltage
- Dual Current Limit Functions
- TriFault Detect Protects Against Feedback Loop Failure
- Sag Protection
- Programmable Soft-Start
- Under-Voltage Lockout (UVLO)
- Differential Current Sensing
Applications
- High Power AC-DC Power Supply
- DC Motor Power Supply
- White Goods; e.g., Air Conditioner Power Supply
- Server and Telecom Power Supply
- Industrial Welding and Power Supply
Q & A
- What is the FAN9673QX used for?
The FAN9673QX is used as a three-channel interleaved Continuous Conduction Mode (CCM) Power Factor Correction (PFC) controller for PFC pre-regulators.
- What are the key benefits of the interleaved operation in the FAN9673QX?
The interleaved operation reduces input and output ripple currents and makes conducted EMI filtering easier and more cost-effective.
- What protection functions does the FAN9673QX include?
The FAN9673QX includes protection functions such as peak current limiting, input voltage brownout protection, and TriFault Detect function.
- What is the operating junction temperature range of the FAN9673QX?
The operating junction temperature range is -40°C to 150°C.
- What are the programmable operation frequency ranges of the FAN9673QX?
The programmable operation frequency ranges are 18 kHz ∼ 40 kHz or 55 kHz ∼ 75 kHz.
- What is the maximum power dissipation of the FAN9673QX at TA < 50 °C?
The maximum power dissipation is 1640 mW.
- What is the thermal resistance (Junction-to-Air) of the FAN9673QX?
The thermal resistance is 77 °C/W.
- What package type is the FAN9673QX available in?
The FAN9673QX is available in a 32-pin LQFP package.
- What are some typical applications of the FAN9673QX?
Typical applications include high power AC-DC power supplies, DC motor power supplies, white goods power supplies, server and telecom power supplies, and industrial welding and power supplies.
- How does the channel management function improve the PFC converter’s performance?
The channel management function allows smooth loading and unloading of slave channels in lower power-level conditions, improving the PFC converter’s load transient response.
