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
Printed OLEDs make large advertising more communicative
March 03, 2015
The VTT Technical Research Centre of Finland is now able to print large Organic Light-Emitting Diodes (OLEDs) to create patterned ...
Motor drive analyser leverages 8-channel, high-definition oscilloscope
Tronics offers to license MEMS processes to foundries
OmniVision, eyeSight, push gesture towards the smartphone
Fraunhofer, Nokia jointly run LTE-A testbed
NXP, Freescale plan mega merger
March 02, 2015
In one of the biggest consolidations in the semiconductor industry to date, NXP and Freescale have announced plans for a ...
Semitrex' ultimate goal: "one size fits all" power conversion
Graphene polymer speeds electron transport
Samsung phones pack 14nm SoC
- High Performance Portable DC Bench Power Supply: Save Money and Free Up Bench Real Estate by Building Your Own
- 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
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.