PFC controller integrates functionality to simplify design
July 02, 2010 // Paul Buckley
Fairchild Semiconductor is introducing an active PFC controller for boost Power Factor Correction (PFC) applications that operate in critical conduction mode (CRM)
The FAN7930 is ideal for LCD and PDP TV applications, as well as for applications using less than 200 W where PFC is mandated, including Class C lighting equipment greater than 25 W, and Class D PC, TV and monitors greater than 75 W.
The PFC controller uses a voltage-mode PWM which compares an internal ramp signal to the error amplifier output, resulting in a MOSFET turn-off signal. Because the voltage-mode CRM PFC controller does not need rectified AC line voltage information, it saves the power loss of an input voltage sensing network necessary for a current-mode CRM PFC controller.
Packaged in an 8-pin SOP, the FAN7930 includes a PFC-ready pin which can be used to trigger the next power stages, as an example in the LLC conversion stage, when PFC output voltage reaches the proper level with hysteresis. Also in the next power stage, the PFC-ready pin eliminates the need for an external circuit for PFC under-voltage lockout (UVLO) while reducing power loss.
The FAN7930 also includes a maximum switching frequency limitation and stable operating at the abnormal condition such as high noise and current. The AC Absent Detection function increases system reliability during the fast AC On-Off Test or in the event of a short electric power failure.
Additionally, the device provides soft-start and overshoot-less functions, reducing voltage and current stress at start-up while eliminating audible noise from unwanted over-voltage protection (OVP) triggering.
Availability and Pricing
Samples of FAN7930 are available now priced at 1.00 US Dollars in 1,000 quantity pieces.
Switch to LED lighting cuts cruising energy costs by 60 percent
February 27, 2015
Europe’s leading holiday cruise company, Costa Cruises has upgraded ten of the company's fleet of cruise liners with more ...
Semitrex' ultimate goal: "one size fits all" power conversion
Porsche rainmaker advocates platooning
Radar-based sensor network helps drivers finding a parking spot
Xilinx flexes its muscles in the ADAS arena
The future of custom ASICs
February 26, 2015
With the prevailing view that Moore's Law is slowing Donnacha O’Riordan, director of services strategy for S3 Group, gives ...
Dual nanowire structure absorbs light efficiently
5 trends to watch at Mobile World Congress
Infineon: CAN FD success goes at the expense of FlexRay
- Software-Defined Radio Handbook
- A Four-Quadrant DC/DC Switching Regulator Smoothly Transitions from Positive to Negative Output Voltages for FPGA and Other Applications
- LED Driver with Integrated Spread Spectrum Reduces EMI without Adding Flicker
- Accelerate SDN and NFV with Off-the-Shelf Software
InterviewInfineon: CAN FD success goes at the expense of FlexRay
The faster version of the venerable CAN bus, CAN FD is currently taking off at several carmakers. Infineon's Thomas Böhm, Head of Body / Automotive, believes this could well go at the expense of FlexRay. ...
Filter WizardCheck out the Filter Wizard Series of articles by Filter Guru Kendall Castor-Perry which provide invaluable practical Analog Design guidelines.
Linear video channel
READER OFFERRead more
To ensure you have a good start in 2015, Freescale is giving away five of its QorIQ TWR-LS1021A Tower system modules, worth USD269 each, for EETimes Europe's readers to win.
The module is the most feature-rich and high-performance Tower system offered by Freescale, enabling compatibility and interoperability with the growing list of Tower expansion modules, offering an easily accessible...MORE INFO AND LAST MONTH' WINNERS...
December 15, 2011 | Texas instruments | 222901974
Unique Ser/Des technology supports encrypted video and audio content with full duplex bi-directional control channel over a single wire interface.