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www.us-tech.com
July, 2012 Wurth Electronics: New Flyback Transformers
Watertown, SD — Wurth Electronics Midcom Inc. is introducing a series of transformers specifically designed to work with Linear Technology’s LT3799, LT3799-1 and LT3798 Isolated No Opto-Coupler Flyback Controllers with Active PFC designs. The transformers utilize differ-
ent modes of flyback operation, cater- ing to power levels ranging from 4W to 100W+. The transformers are designed using a special winding technique to produce a very low leak- age inductance, less than one per- cent, which maximizes the power fac- tor and efficiency of the Linear Technology drivers. The designs comply with vari-
ous UL, EN and IEC safety stan- dards and satisfy reinforced insula- tion requirements. High dielectric (Hipot) withstanding requirement of up to 4.5kVAC is achieved by these flyback designs.
The LT3799 is an isolated fly-
back controller with power factor cor- rection specifically designed for driv- ing LEDs. The controller operates
using critical conduction mode allow- ing the use of a small transformer. Using a novel current sensing scheme, the controller is able to
deliver a well-regulated current to the secondary side without using an opto-coupler. A strong gate driver is included to drive an external high voltage MOSFET. Utilizing an onboard multiplier,
the LT3799 typically achieves power factors of 0.97. The FAULT pin pro- vides notification of open and short LED conditions. The LT3799-1 offers improved line regulation over the LT3799, but is not designed for
use with a TRIAC dimmer. Contact: Wurth Electronics
Midcom, Inc., PO Box 1330,
Watertown, SD 57201 % 605-886-4385 fax: 605-886-4486 E-mail:
midcom@we-online.com Web:
www.we-online.com/midcom
Specially-wound transformers. automated solutions, Inc.
Schaefer Adds New Voltages for Power Units
• Micro-Spot Welding • Compacting • Splicing • Contact Welding • Resistance Brazing • Terminal Welding
AUTOMATION
• Automation • Resistance Welding • Laser Welding • Stamping/Bending • Controllers • Inverters
MANUAL STATIONS
Hopkinton, MA — Schaefer, Inc. has broadened the capabilities of its Raptor Series of military power sup- plies. The Raptor’s robust construc- tion, sealed enclosure, and high reli- ability make it a suitable choice for harsh military applications such as shelters, armored vehicles, avionics, naval and open air applications. The Raptor’s output voltage
range is now extended to provide DC outputs from 12 to 52.5VDC with power ratings from 1200W to 1800W. Parallel capability and other power levels are also available. Single and three-phase input ranges span from 88V to 265VAC or 125 to 400VDC. The power supplies specify high effi- ciency (85 percent nominal) and high power factor correction. The product meets MIL-STD- 810D for operating temperature con-
CUSTOMIZED MODULES CU M
“Raptor” military power supply.
ditions, vibration and shock and also meets other critical MIL-STD-461 ratings for EMI, navy MIL-STD-1399 and aircraft electrical power MIL- STD-704D, and environmental test methods. A variety of optional protection
39 Scenic View Drive • Deep River, CT 06517 Phone: 860-227-0683 Fax: 860-526-9296 Internet:
www.strunk.de www.strunk-connect.com
automated solutions, Inc. Email:
info@strunk.de
features include CARC, dark out switches, alarm/controls, auto tem- perature derating, overvoltage protec-
tion, and reverse polarity protection. Contact: Schaefer, Inc., 45
South Street, Hopkinton, MA 01748 % 508-435-6400 fax: 508-435-6401
E-mail
military@schaeferpower.com Web:
www.schaeferpower.com
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