Hosted by Alix Paultre, the Tinker's Toolbox is the Advantage Design Group's web-based interview show where we talk about the latest technology, components, and design issues for the electronic design engineering community.
In this episode, we talk to Carl Walding, Field Applications Engineering and Applications Lab Manager for Fairchild Semiconductor, on portable power. We discuss issues from power efficiency to parasitic wall-warts to device stand-by states. We also have the PowerPoint from the APEC presentation on Fairchild's FAN302HL PWM controller .
Here is the link to the podcast in case the play button is not visible: Fairchild Interview.
Here is a presentation on Fairchild's digital power management technology: Fairchild Presentation
Here is the press release on Fairchild's FAN302HL PWM controller:
Cell phone chargers typically sit plugged in and unused most of the time. Yet, they still draw power from the grid, wasting energy and the consumer’s money. The problem facing design engineers is clear – how can standby power be reduced in these devices, thereby saving energy, meeting government regulations and saving the consumer money?
To help designers meet this challenge, Fairchild Semiconductor developed the FAN302HL PWM controller for low standby power charger applications. Incorporating mWSaver technology, the device features patented technologies that allow the FAN302HL to minimize standby input power consumption to <10mW@230VAC, exceeding ENERGY STAR® Program Requirements for Computers Version 5.0 efficiency standards.
This highly integrated PWM controller provides several features to enhance the performance of general flyback converters. Integrating a 500V JFET, the FAN302HL allows the device to cut off the current path after the device is turned on, reducing start-up losses. The patented constant current control topology enables simplified circuit design without secondary constant current feedback circuitry, especially important in battery charger applications.
The FAN302HL also provides several protection features. These include cycle-to-cycle current limiting to ensure a fixed peak current limit level, even if a short circuit occurs. Additionally, the gate output is also clamped at 15V to protect the power MOSFET from high gate-source voltage damages.
The FAN302HL does not require an external secondary-side over-voltage protection (OVP) circuit. If either VS pin OVP or internal over-temperature protection is triggered, the device enters latch mode until AC power is removed, saving second side OVP components and tightening VO protection (<6V).
Innovative technology reduces numerous losses in both the power MOSFET and the PWM IC. Primary side regulation control for constant current and no second side current sensing provides lower losses and improved efficiency. Proprietary burst mode operation, with lower operation current, minimizes the standby power consumption.
Additionally, the FAN302HL uses secondary-side regulation for constant voltage with good dynamic response, meeting USB 2.0 specifications. By using the FAN302HL, a charger can be implemented with fewer external components, minimizing cost when compared to conventional designs or a linear transformer.
In addition to cell phone chargers, the FAN302HL is ideal for applications such as smartphones, cordless phones, DVD/Set-Top Boxes, Power Over Ethernet and small appliances.
The FAN302HL, available in an 8-pin, small outline package, offers a fixed PWM frequency at 85kHz with frequency hopping to reduce EMI.
Fairchild enables engineers to drive innovation in their designs by developing solutions like the FAN302HL – part of a series of products developed using mWSaver technology offering best-in-class power savings for power supplies, with the fewest possible components.
Price: US $00.50 in 1,000 quantity pieces
Availability: Samples available now
Delivery: 8-10 weeks ARO
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.