Overview
The FAN9672Q is an interleaved two-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 of the FAN9672Q reduces input and output ripple currents, making conducted EMI filtering simpler and more cost-effective. Additionally, it features an innovative channel-management function that improves the PFC converter’s load transient response by smoothly loading and unloading slave channels based on the setting voltage on the CM pin.
Key Specifications
| Parameter | Description | Value |
|---|---|---|
| Operating Temperature Range | -40°C to 105°C | |
| Package Type | 32-Lead, Low Quad Flat Package (LQFP) | |
| Programmable Operation Frequency Range | 18 kHz ~ 40 kHz or 55 kHz ~ 75 kHz | |
| Programmable PFC Output Voltage | 0.3 V ~ 3.5 V | |
| Current Limit Functions | Dual current limit functions | |
| Protection Functions | Peak current limiting, input voltage brownout protection, TriFault Detect™ function, SAG protection | |
| Under-Voltage Lockout (UVLO) | Typical turn-on and turn-off threshold voltages: 12.8 V and 10.8 V | |
| Differential Current Sensing | Available | |
| Soft-Start | Programmable soft-start |
Key Features
- Continuous Conduction Mode Control
- Two-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 (Uninterruptible Power Supply)
- Industrial Welding and Power Supply
Q & A
- What is the primary function of the FAN9672Q?
The FAN9672Q is an interleaved two-channel Continuous Conduction Mode (CCM) Power Factor Correction (PFC) controller IC designed for PFC pre-regulators.
- What are the key benefits of the interleaved operation in the FAN9672Q?
The interleaved operation reduces input and output ripple currents, making conducted EMI filtering simpler and more cost-effective.
- What protection functions are included in the FAN9672Q?
The FAN9672Q includes peak current limiting, input voltage brownout protection, TriFault Detect™ function, and SAG protection.
- How does the channel-management function work in the FAN9672Q?
The channel-management function allows the power level of the slave channels to be loaded and unloaded smoothly according to the setting voltage on the CM pin, improving the PFC converter’s load transient response.
- What is the programmable operation frequency range of the FAN9672Q?
The programmable operation frequency range is 18 kHz ~ 40 kHz or 55 kHz ~ 75 kHz.
- What is the typical turn-on and turn-off threshold voltage for UVLO in the FAN9672Q?
The typical turn-on and turn-off threshold voltages for UVLO are 12.8 V and 10.8 V, respectively.
- Does the FAN9672Q support differential current sensing?
- What is the package type of the FAN9672Q?
The FAN9672Q is available in a 32-Lead, Low Quad Flat Package (LQFP).
- What are some typical applications of the FAN9672Q?
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 soft-start function work in the FAN9672Q?
The soft-start function is programmable and can be set by connecting a capacitor to the SS pin. Pulling this pin to ground can disable the gate drive outputs OPFC1 and OPFC2.
