Overview
The FAN9673Q is an interleaved three-channel Continuous Conduction Mode (CCM) Power Factor Correction (PFC) controller IC produced by onsemi. It is designed for PFC pre-regulators and incorporates circuits for leading edge, average current, and “boost”-type power factor correction. This controller enables the design of power supplies that fully comply with the IEC1000-3-2 specification. The interleaved operation reduces input and output ripple currents, making conducted EMI filtering easier and more cost-effective. The FAN9673Q also features an innovative channel management function that improves the PFC converter’s load transient response and includes various protection functions such as peak current limiting, input voltage brownout protection, and TriFault Detect™ function.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| Operating Temperature Range | -40°C | 105°C | ||
| Package Type | LQFP-32 | |||
| Operation Frequency Range | 18 kHz | 75 kHz | ||
| Programmable PFC Output Voltage | 3.5 V | 0.5 V | ||
| Drive Capability | 470 / 550 mA | |||
| Under-Voltage Lockout (UVLO) | 12.8 V | |||
| Current Limit Functions | Dual |
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
- UPS
- Industrial Welding and Power Supply
Q & A
- What is the FAN9673Q used for?
The FAN9673Q is used as a Power Factor Correction (PFC) controller IC for PFC pre-regulators. - What are the key benefits of the interleaved operation in the FAN9673Q?
The interleaved operation reduces input and output ripple currents and makes conducted EMI filtering easier and more cost-effective. - What protection functions does the FAN9673Q include?
The FAN9673Q includes peak current limiting, input voltage brownout protection, and TriFault Detect™ function. - What is the operating temperature range of the FAN9673Q?
The operating temperature range is -40°C to 105°C. - What is the package type of the FAN9673Q?
The package type is LQFP-32. - What are the programmable operation frequency ranges of the FAN9673Q?
The programmable operation frequency ranges are 18 kHz ~ 40 kHz or 55 kHz ~ 75 kHz. - Does the FAN9673Q support programmable PFC output voltage?
Yes, the FAN9673Q supports programmable PFC output voltage. - What is the Under-Voltage Lockout (UVLO) threshold of the FAN9673Q?
The UVLO threshold is 12.8 V. - What are some typical applications of the FAN9673Q?
Typical applications include high power AC-DC power supplies, DC motor power supplies, white goods, server and telecom power supplies, UPS, and industrial welding and power supplies. - How does the channel management function improve the PFC converter’s performance?
The channel management function allows the power level of the slave channels to be loaded and unloaded smoothly, improving the PFC converter’s load transient response.
