Electronica Showcases Latest Power Products

Nov 22, 2006 10:26 AM
by David Morrison, Editor, Power Electronics Technology

For systems that require charging from either ac or USB sources, AnalogicTech unveiled the AAT2551 SystemPower IC. Similar to the AAT2550, this device features a 1-A charger and two 600-mA buck converters. However, the charger in the AAT2551 offers dual-path ac adapter and USB charging. The USB path offers two user-programmable charge currents to support USB low and high charge levels. The charger in the AAT2551 also adds AnalogicTech’s charge reduction function, which automatically reduces charge current just enough to preserve the integrity of the USB host voltage. The company also announced the AAT2830/31 Total Display Solution for handsets and other portable systems operating off a single Li-ion cell. Built around a high efficiency, tri-mode charge pump, these chips deliver up to 600 mA of current for the growing array of lighting applications in portable systems including main- and sub-display backlighting, camera flash, and RGB or auxiliary status lighting. Individual driving circuits for each function are controlled by AnalogicTech’s single-wire serial digital interface.

Avago Technologies (www.avagotech.com/optocouplers) unveiled three families of solid state relays (SSRs) with what is claimed to be the industry’s highest insulation voltage in a miniature SO-4 package. These relays are also said to offer the industry’s fastest switching speed (less than 1 ms) at the 1-A rating.

Specifying 3.75 kV of insulation protection, Avago’s expanded family of SSRs with MOSFET outputs enables designers to improve power efficiency, performance and reliability in low- and high-current circuits often found in telecommunications, consumer electronics, automotive and industrial applications.

Avago’s ASSR-1510/1511/1520 family of 60-V, 1-A, 0.5-Ω relays provides the fastest switching speed available among 1-A SSRs, says the vendor. Along with the ASSR-15xx, the ASSR-4110/4120 family of 400-V, 0.12-A, 25-Ω relays and the ASSR-1410/1420 family of 60-V, 0.6-A, 1-Ω relays are available as 1 Form A (single-channel) SSRs with MOSFET outputs in SO-4 packages and as 2 Form A (dual-channel) SSRs in DIP-8 packages. Each product family features qualified performance across the -40ºC to +85ºC temperature range, a switching speed of less than 1 ms and transient immunity greater than 1 kV/µs.

TT electronics introduced several resistive components targeting power applications. The company’s BI Technologies SMT Division (www.bitechnologies.com/products/passive.htm.) debuted a 75-W nonmolded power resistor that exploits three methods of power dissipation to achieve exception power handling. Housed in a TO-220 opened-screened-substrate package, the BHP75 Series resistor features an insulated tapered venturi bonded to the substrate for maximum heat dissipation. Typical applications include switch-mode power supplies, motor control and drive circuits, inverters and industrial power equipment.

Want to use this article? Click here for options!
© 2007 Penton Media, Inc.