Fairchild's FAN104W, High-Frequency PSR PWM Controller

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.

Key Features:
•Constant-voltage (+/- 5%) with cable compensation
•Constant-current control (+/-7%) using Fairchild’s TRUECURRENT technology
•Boundary conduction mode 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

Price: US $0.36 in 1,000 quantity pieces
Availability: Samples available upon request.
Delivery: 8-16 weeks ARO