TechBites Says:

Although they are intended for very cost-sensitive applications like cell phone chargers and lower-powered LED lighting, Fairchild’s latest family of primary-side-regulated supply ICs don’t skim on features or performance. The designers who created them have done a great job in shaving off every unnecessary mW from their standby power to meet the stringent new EnergyStar IV requirements. They’ve also used some clever architectural tricks to shave the supplies BOM costs down to a minimum without sacrificing all the nifty protection features that have become a hallmark of Fairchild products.

This new family of Fairchild PSRs uses the transformer’s AUX winding as voltage feedback signal source, eliminating the need for the external voltage reference, optocoupler and other secondary side feedback circuitry usually associated with PSR designs. The controllers’ on-chip protection (brownout  and over-voltage) and power sequencing circuitry provides additional BOM cost savings. Although deriving the reference voltage from the Aux winding does not give quire as precise voltage regulation as an opto-based design, Fairchild says that it’s more than enough for the battery charging circuits used in most cell phones, cameras, cordless hand tools and other handheld devices. Despite their low cost, the controller series includes adjustable power factor correction capability that maintains a power factor of 0.98 or better (and a THD of 4.6% or less) over is full range of loads and operating voltages.

All devices are sampling now, with 6-week delivery of production quantities.

FSEZ1317       US$0.53 each 1,000 pieces

FSEZ1307       US$0.51 each 1,000 pieces

FAN103          US$0.48 each 1,000 pieces

Data Sheets (.pdf format)

FSEZ1307 - http://www.fairchildsemi.com/ds/FS/FSEZ1307.pdf

FSEZ1317 - http://www.fairchildsemi.com/ds/FS/FSEZ1317.pdf

FAN103 - http://www.fairchildsemi.com/ds/FA/FAN103.pdf

Fairchild Semiconductor Says:

Fairchild Semiconductor Offers Broadest Selection of PSR PWM Controllers

Solutions Help Designers Meet Standby Power and Regulatory Specifications

 Fairchild Semiconductor’s industry-leading portfolio of primary side regulation (PSR) PWM controllers offers designers of mobile chargers, adapters and LED lighting applications multiple solutions to meet the stringent power and regulatory specifications such as ENERGY STAR Level V.

In charger and adapter applications, designers have been challenged to lower standby power and achieve higher efficiency, all while reducing the form factor of their designs. Currently in these applications, RCC or other IC solutions are used with varying degrees of success. With the broadest portfolio of PSR PWM controllers in the industry, including the FSEZ1307 PSR controller with high voltage (HV) startup and an integrated MOSFET, Fairchild devices simplify designs, save board space and meet today’s demands for power savings.

Key features available in the Fairchild portfolio are 30mW standby power, HV start up and an integrated power MOSFET for ease of design, primary side regulation without secondary side feedback and a universal AC input range. Unlike competitive solutions, Fairchild’s PSR PWM controllers achieve constant voltage (CV) (±5%), constant current (CC) (±7%), 30mW standby power and ENERGY STAR Level V efficiency, all with a competitive bill of materials (BOM) cost and component count.

For LED lighting applications, Fairchild’s PSR PWM controllers achieve the most accurate CC through built-in, proprietary TRUECURRENT technology and tight CV without secondary-side feedback circuitry. Constant current allows the device to accommodate different numbers of LED units in a string, increasing design flexibility, stretching the lifetime of HB LEDs and reducing time-to-market.

Fairchild’s PSR PWM controller portfolio, including the FSEZ1307, FSEZ1317 and FAN103, enhance Fairchild’s extensive power offerings that enable efficient electronics and maximize energy savings in power-sensitive applications such as power adapters, power supplies, lighting applications, computers, industrial controls and home appliances.