Designers of power supply applications for portable devices are demanding USB chargers capable of providing lower standby power consumption and higher system efficiency in a compact size. Fairchild Semiconductor (NYSE: FCS)’s FAN104W high-frequency PSR (primary-side regulation) PWM controller helps designers meet these technical challenges.

The FAN104W incorporates Fairchild’s Green-Mode feature, which provides off-time modulation capable of linearly reducing the PWM frequency, thereby delivering performance that surpasses USB charger standards while offering low standby power characteristics of < 30mW and enhanced dynamic response characteristics of > 4.1V. Since the FAN104W operates at a frequency of 85kHz, the size of passive components can be reduced, supporting the increasing technical challenges associated with small size requirements. The device can also operate in boundary mode, improving efficiency by 2–3% under full load while reducing thermal issues.

By leveraging Fairchild’s expertise in primary-side regulation (PSR), the FAN104W does not require a secondary feedback loop and efficiently converts and manages the power supply of charging devices. Furthermore, the device minimizes the number of components and overall bill-of-material (BOM) costs through highly integrated 500V JFETs that reduce start-up losses by switching the current path to the off state when the device is switched on. With these optimized features and various integrated protection functions such as VSOVP, Vs/Cs, and open/short circuit protection, the FAN104W provides a balanced solution for USB chargers.

For additional information and sample orders, please refer to the following.
http://www.fairchildsemi.com/pf/FA/FAN104W.html

Key Features:

• Constant-voltage (CV) (+/- 5%) characteristics through cable compensation function
• Constant-current (CC) (+/-7%) characteristics using Fairchild’s TRUECURRENT® technology
• BCM (Boundary conduction mode) operation for improved efficiency
• Provides a wide Vcc range (5V-23V) for wider CC range designs
• Standby power consumption: < 30mW under 7.5W conditions and < 50mW under 10W conditions
• High-voltage startup
• SOP-8 package support

Fairchild's power management devices, along with a vast portfolio of portable power solutions, help designers innovate and differentiate their portable products. By collaborating with customers and identifying market development trends, Fairchild is continuously developing power management solutions suitable for advancing portable designs and enriching the user experience.

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Price: $0.36 per unit based on a supply of 1,000

Status: Samples available upon request

Delivery: 8–12 weeks after order placement

contact:

To contact Fairchild Semiconductor regarding this product, please click the address below:
http://www.fairchildsemi.com/cf/sales_contacts/ .

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

Editor's Note: Please refer to below for the data sheet in PDF format.
http://www.fairchildsemi.com/ds/FA/FAN104W.pdf