Power Management


receiver performance due to aggressor-victim crosstalk. Keeping the via and solder ball pad region consistent with Layout_2, Figure 5 shows two additional changes in the package layout with respect to the chip to package wire bond connections. Figure 6 shows the


Figure 4


differential TDR and return loss performance of the three layouts. The response for Layout_2 in blue is the same as shown before. Layout_4 has slightly better TDR performance due to the relatively smaller inductive discontinuity and its impact in frequency domain is unchanged. Layout_5 TDR response shows almost 2x the


Figure 5


inductive spike due to the wire bonds compared to the other two layouts. The direct impact of long wire bonds on return loss performance deterioration is also shown in Figure 6 below. In this article we have applied optimisation techniques to a relatively rigid package solution typically used for signal conditioning type products. We’ve identified the two major discontinuity regions in a wire bond package and looked at techniques in optimising the wire bond package layout for data rates in the 10Gbps range.


Integrated Device Technology | www.idt.com


Jitesh Shah is an Advanced Packaging Engineer at Integrated Device Technology


Figure 6


X-ES introduces 12-volt-centric VITA 62 power supply


Extreme Engineering Solutions (X-ES) is making available the XPm2120, a conduction-cooled, VITA 62, 3U VPX power supply that takes a MIL- STD-704 input voltage of 28 V-DC and provides up to 300W of power on the 3.3-volt, 5-volt, and 12-volt rails at 90% efficiency with 12-volt as the primary power distribution rail in the system. Designed for rugged, deployed military applications, the slim 0.8-inch pitch XPm2120 integrates MIL-STD-461E EMI filtering. The device can operate over a wide range of input voltages from 16 V to 50 V steady-state while maintaining up to 300 W of isolated output power. It provides up to 15 A of current on the 3.3-volt rail, 15 A on the 5-volt rail, and 25 A on the 12-volt rail in a compact, 3U VPX form factor. With support for current sharing, two devices can be connected in parallel to provide increased power output. Using 12 V, as opposed to 5 V, has several advantages for system designers. First, higher voltage distribution sources, such as 12 V, can


utilize smaller copper power planes within the backplane and modules because of lower steady state currents and the resulting decreased distribution losses. Secondly, susceptibility to current transients is greatly reduced when using 12V as the distribution power rail because there is much less current draw, and 12 V can dip much further than 5 V before being out of tolerance. Finally, because higher voltage distribution


sources (such as 12 V) allow for smaller copper power planes, the board’s layer count, its complexity, and its cost can be decreased. The XPm2120 has been designed to the VITA 62 draft standard.


Extreme Engineering Solutions | www.xes-inc.com


TDK-Lambda’s NV700 modular power supplies meet latest medical approvals


TDK-Lambda UK has attained 3rd Edition IEC/EN 60601-1, ANSI/AAMI ES60601-1 and CAN/CSA- C22.2 No 60601-1-08 medical safety approvals for its NV700 modular AC-DC power supplies – this is in addition to the current approval to the 2nd Edition, ensuring full safety approval for medical equipment is maintained during the transition period from 2nd to 3rd Editions. Typical medical applications for the NV700 include clinical diagnostic systems, medical


36 March 2012


imaging equipment, dialysis systems and medical lasers. The NV700 is also well-suited to meeting the ever increasing demands of the broadcast and instrumentation markets, as well as other applications, such as ATE, automation, routers, servers and security networks. TDK-Lambda has actively participated in the Underwriters Laboratories (UL) ‘Clients Test Data Program’ (CTDP) and the IECEE CB Scheme SMT (Supervised Manufacturer’s Test) Program,


Components in Electronics


Powersolve unveils PP3 equivalent primary and rechargeable lithium batteries


Power supply specialist Powersolve has launched two new series of Lithium batteries designed to replace 9V PP3 batteries in applications that require long life, a stable operating voltage and a very low self-discharge rate. The G600 Series are rechargeable Lithium Polymer batteries while the CP9V Series are Lithium Manganese Dioxide primary batteries. G600 Series batteries are reusable


alternatives to standard PP3 format alkaline batteries. They have a rated capacity of 600mAh and feature a standard charge cycle of four hours. These G600 batteries do not suffer from memory effect and come with a protective circuit module (PCM) which protects against over-charging, over-discharging and over current. They are fully safety tested for impact, crushing, short circuit and piercing and operate between -20 and +60ºC. Powersolve can also supply chargers. With a nominal capacity of 1200mAh, CP9V batteries feature a maximum continuous current of 400mA, a maximum pulse current of


which is now also under the supervision of UL, for over 16 years. Being on these programs has allowed TDK-Lambda to use its own testing facilities to generate UL and CB safety reports and test data, reducing time and the accompanying costs for the safety approvals of its own AC-DC power supplies and DC-DC converters.


In addition to 60601-1 3rd Edition, products in the NV700 range meet Class B conducted and radiated EMC EN55011 and EN55022 and are approved to EN/IEC/UL/CSA 60950-1 for general purpose applications and EN/IEC 61010-1 for laboratory and process control applications. In addition, all NV700 units carry the CE mark,


according to the LV Directive, and come with a three-year warranty.


TDK-Lambda | www.uk.tdk-lambda.com www.cieonline.co.uk


800mA and a self-discharge rate of less than 2% per annum @ 30ºC. Housed in an ABS case weighing just 33 grams, these batteries operate at temperatures up to +60ºC.


Powersolve Electronics | www.powersolve.co.uk


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