Electronicdesign 7172 0514producttrendspromo
Electronicdesign 7172 0514producttrendspromo
Electronicdesign 7172 0514producttrendspromo
Electronicdesign 7172 0514producttrendspromo
Electronicdesign 7172 0514producttrendspromo

LED Controller Provides “Half-Watt Standby”

April 9, 2014
Marvell's product announcment describes a dimmable LED driver that incorporates an efficient ac/dc supply for a companion ZigBee controller. It's a way to meet government "half-Watt standby" regulations.

The “Half-Watt Standby” requirement for plug-in ac-dc power supplies has been a requirement—first in California’s CEC400 energy efficiency standard and then as part of Energy Star—for almost a decade. When a “wall wart” is plugged in, but the device it is powering is not turned on, the ac-dc supply must not consume more than 500 mW. 

Download this article in .PDF format
This file type includes high resolution graphics and schematics when applicable.

That’s still a challenge in LED lighting that uses a dimmer to control brightness by means of a ZigBee, Bluetooth, or Wi-Fi link. “Half-Watt Standby” implies that, even when the LED bulb is dark, the supply for the LED driver and radio receiver cannot consume more than 500 mW.

Marvell meets these standards with the compact 88EM8189 single-stage, constant current, intelligent LED controller (with an integrated I2C-compatible interface) and the 88MZ100 ZigBee microcontroller, which interfaces with the 88EM8189. The ac-dc supply for wireless functionality is built into the dimmer.

The 88EM8189 includes an energy-efficient on-chip supply for the ZigBee IC, which implements the wireless aspect of dimming. In fact, many wireless or wired controllers could be used with the 88EM8189, as long as they have an I2C interface. The 88EM8189 can be used in buck-boost (non-isolated) or flyback design topologies (see the figure).

To meet government standby efficiency standards in wireless LED dimming, Marvell built the ac-dc supply for the wireless part of the system into the dimmer and used a simple I2C interface. The 88EM8189 and 88MZ100 are compatible with ZigBee and can accommodate other wireless and wired standards.

Sponsored Recommendations

Highly Integrated 20A Digital Power Module for High Current Applications

March 20, 2024
Renesas latest power module delivers the highest efficiency (up to 94% peak) and fast time-to-market solution in an extremely small footprint. The RRM12120 is ideal for space...

Empowering Innovation: Your Power Partner for Tomorrow's Challenges

March 20, 2024
Discover how innovation, quality, and reliability are embedded into every aspect of Renesas' power products.

Article: Meeting the challenges of power conversion in e-bikes

March 18, 2024
Managing electrical noise in a compact and lightweight vehicle is a perpetual obstacle

Power modules provide high-efficiency conversion between 400V and 800V systems for electric vehicles

March 18, 2024
Porsche, Hyundai and GMC all are converting 400 – 800V today in very different ways. Learn more about how power modules stack up to these discrete designs.

Comments

To join the conversation, and become an exclusive member of Electronic Design, create an account today!