PFC/PWM controller provides higher efficiency in dual-switch flyback topologies
December 16, 2010 // Paul Buckley
Fairchild Semiconductor has introduced an integrated critical mode PFC and quasi-resonant current mode PWM controller that meets regulatory requirements by providing more than 90 percent efficiency and less than 300 mW at no load for increased power savings.
The FAN6920MR combines a power factor correction (PFC) controller and a quasi-resonant PWM controller for a cost effective design that uses fewer external components. The device was developed for power engineers, especially those involved in All-In-One (AIO) PC power, Slim Pack PC adapters, LCD TV and LED lighting designs, that require a dual switch flyback topology to provide the higher efficiency and increased energy savings demanded by government regulations – something that LLC or single flyback solutions cannot provide.
For PFC, the device uses a controlled on-time technique to provide a regulated DC output voltage and to perform natural power factor correction. With an innovative total harmonic distortion (THD) optimizer, the FAN6920MR can reduce input current distortion at zero-crossing duration to improve THD performance.
For PWM control, the FAN6920MR provides several functions to enhance the power system performance including extended valley detect up to the 12th valley cycle for reduced switching frequency, improved light load efficiency, green-mode operation, an internal 10ms soft start and high/low line over-power compensation.
Additionally, the device provides many protection functions including brownout, secondary-side open-loop and over-current with auto recovery, external auto-recovery protection triggering and internal over-temperature shutdown.
Available in a 16-pin small outline package (SOP), the FAN6920MR is ideal for AIO computers, AC/DC netbook adapters (Slim Pack), open-frame SMPS and battery chargers, as well as LCD TV and LED street lights.
Fairchild enables engineers to drive innovation in their designs by developing solutions like the FAN6920MR, which is part of a family of integrated critical mode PFC and quasi-resonant current mode PWM controllers. The devices integrate functionality, increase performance and provide full protection while lowering component counts, simplifying design and reducing bill of material costs.
Availability and Pricing
Samples of the FAN6920MR are available now priced at $00.82 in 1,000 quantity pieces
More information about the FAN6920MR at www.fairchildsemi.com/ds/FA/FAN6920MR.pdf
Visit Fairchild Semiconductor at www.fairchildsemi.com
DecaWave preps for expansion, next location chip.
September 03, 2015
Even though ultrawideband fabless chip company DecaWave Ltd. (Dublin, Ireland) has only recently raised funding of $4.5 million ...
These five trends drive automotive innovation
How to increase your engineering value in just 20 minutes a day
Google-led group preempts HEVC
IT security is changing: if the SIEM is dead, what's next?
Serdes startup Credo raises $8 million
September 03, 2015
Credo Semiconductor Inc. (Milpitas, Calif.), a developer of serializer-deserializer circuits, technology and IP cores, has ...
The future of print and paper: digital hybrids
Google backer offers $50 million quantum computer investment
Solar-charged transparent Li-ion battery promises 'smart windows'
- High Voltage CMOS Amplifier Enables High Impedance Sensing with a Single IC
- Software-Defined Radio Handbook
- Why Making the Move from a Variable Transformer to a VariPLUS is the Right Decision
- Automating Leakage and Functional Testing
InterviewCEO interview: Ambiq sees broader options for low voltage
Mike Noonen, recently appointed interim CEO at microcontroller startup Ambiq Micro, discusses the focus and opportunities for this pioneering company designing circuits that can operate below the threshold ...
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
This month, Altera is giving away three of its second-generation Nios II Embedded Evaluation Kit (NEEK), worth 9 each, for EETimes Europe's readers to win.
The feature-rich platform provides a fast and simple way for embedded designers to experience the capabilities of a custom embedded processor in a non-volatile FPGA.
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.