Machine Learning Authors: Zakia Bouachraoui, Liz McMillan, Roger Strukhoff, Pat Romanski, Carmen Gonzalez

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Fairchild Semiconductor’s High-Frequency PSR PWM Controller Exceeds USB Charger Standards, Reduces Low Standby Power Consumption

Designers of power supply applications for portable devices require a USB charger with lower standby power consumption and higher system efficiency in a small form factor. Fairchild Semiconductor’s (NYSE: FCS) FAN104W high-frequency primary-side regulation (PSR) PWM controller helps designers meet these challenges.

Incorporating Fairchild’s green-mode function that provides off-time modulation to linearly decrease PWM frequency under light-load conditions, the FAN104W exceeds the USB charger standard with a low standby power of < 30mW and an improved dynamic response of > 4.1V. The FAN104W operates at 85kHz frequency to downsize passive components, assisting in the growing challenge of small form factor requirements. The device can also operate in boundary mode, improving efficiency in full load by 2-3 percent while reducing thermal issues.

Leveraging Fairchild’s expertise in primary-side regulation, the FAN104W does not require a secondary-side feedback loop and efficiently converts and manages the power supply of the charging device. Additionally, the device minimizes component count and overall bill-of-material costs with a highly integrated 500V JFET that reduces start-up losses by shutting off the current path after the device has been turned on. It is these optimized features plus rich, integrated protection features such as VSOVP and Vs/Cs, open/short protection that makes the FAN104W a well balanced solution for USB chargers.

For more information or to order samples, visit: http://www.fairchildsemi.com/pf/FA/FAN104W.html

Key Features:

  • Constant-voltage (CV) (+/- 5%) with cable compensation
  • Constant-current (CC) control (+/-7%) using Fairchild’s TRUECURRENT® technology
  • Boundary conduction mode (BCM) operation for higher efficiency
  • Wide Vcc range ( 5V-23V ) for wider CC range design
  • Standby power consumption : < 30mW at 7.5W and <50mW at 10W
  • High-voltage startup
  • SOP-8 package available

Fairchild's power management devices, along with its broad portfolio of portable power solutions, allow designers to innovate and differentiate their portable offerings. By working with customers, as well as by identifying developing trends in the marketplace, Fairchild continues to develop the right power management solutions that advance portable designs and enrich the user experience.

Fairchild Semiconductor: Solutions for Your Success™

Price: US $0.36 in 1,000 quantity pieces

Availability: Samples available upon request.

Delivery: 8-16 weeks ARO

Contact Information:

To contact Fairchild Semiconductor about this product, please go to: http://www.fairchildsemi.com/cf/sales_contacts/.

For information on other products, design tools and sales contacts, please visit: http://www.fairchildsemi.com.

Note to Editor: For a datasheet in PDF format, please go to:


About Fairchild Semiconductor:

Fairchild Semiconductor (NYSE: FCS) – global presence, local support, smart ideas. Fairchild delivers energy-efficient, easy-to-use and value-added semiconductor solutions for power and mobile designs. We help our customers differentiate their products and solve difficult technical challenges with our expertise in power and signal path products. Please contact us on the web at http://www.fairchildsemi.com.

Follow us on Twitter @ http://twitter.com/FairchildSemi

View product and company videos, listen to podcasts and comment on our blog @ http://www.fairchildsemi.com/engineeringconnections

Visit us on Facebook @ http://www.facebook.com/FairchildSemiconductor

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