The conceptually simple idea to determine current by measuring voltage across a known resistor shows the subtle nature of design tradeoffs. Part 1 of this article looked at one important aspect of the choice of resistor value in current-sensing applications, but it was only the electrical impact. However, the thermal impact related to resistor I2R […]
Power Electronic Tips
A tradeoff case study: Sizing the current-sense resistor, Part 1
The conceptually simple idea to determine current by measuring voltage across a known resistor shows the subtle nature of design tradeoffs. There’s probably no phrase that misrepresents the realities of engineering design other than “hey, that should be no big deal.” Even simple-looking design decisions are often not so simple. The reality is that a […]
20-W dc-dc converter sits in 1-in-sq metal can
TRACO POWER announces their new THN 20WIR series of 20-watt high-density DC/DC Converters in the industry-standard 1” x 1” footprint which has been qualified for railway and rugged industrial applications with EN 50155 and EN 61373 certifications and IEC /EN /UL 62368-1 approval. The THN 20WIR series of ruggedized 20 Watt DC/DC converters offer high-reliability […]
Basics of board-mounted dc/dc converter reliability
The reliability of board-mounted dc/dc converters is important to understand and quantify. It’s a measure of the frequency of system or device failures as a function of time. Reliability is the observed failure rate and is defined as either the time between two failures (in hours), called the Mean Time Between Failures (MTBF), or the […]
Low-cost non-isolated POL regulator modules provide up to 2 A
Introducing the SVR surface mount and VR through-hole, non-isolated DC-DC switching regulators. With efficiencies of up to 96% and operating temperatures of -40°C to +85°C, the Point of Load (PoL) devices are ideal as replacements for low-efficiency linear regulators. They operate from a wide input range of up to 36V and feature a low quiescent […]
EMC/EMI design and the use of board-mount dc/dc converters
Electromagnetic compatibility (EMC) and electromagnetic interference (EMI) are system-level considerations that have implications for power system design, especially when multiple board-mounted dc/dc converters are used in a distributed power architecture (DPA). EMC/EMI is a multidimensional consideration and includes differential- and common-mode noise on both the input and output of the converter radiated and conducted noise […]
450-W supplies offer class II safety protection
Traco Power launched its TPP 450 series two years ago, quickly recognized as one of the most reliable high-density 3×5 power supplies in the industry. The series now offers a major expansion with Protection Class II models (TPP 450BA-M Open-Frame Models and TPP 450B-M Enclosed with Fan Models). These products are ideal for non-stationary requirements […]
Convection cooled sealed supplies offer IP66/67/68 ingress protection
Bel Power Solutions today announced the ABS601 (industrial) and MBS601 (medical) Series of convection cooled sealed power supplies which are fully potted and offer IP66/67/68 ingress protection. The ABS601 Series delivers a steady 600 W (800 W peak for 10 s) of regulated DC power in single 24 and 48 VDC main output voltages and a […]
AEC-Q101-qualified p-channel MOSFET offers ON-resistence down to 30 mΩ
Vishay Intertechnology, Inc. today introduced a new AEC-Q101 qualified p-channel -100 V TrenchFETMOSFET designed to increase power density and efficiency in automotive applications. Not only is the Vishay Siliconix SQJ211ELP the industry’s first such device in the compact 5 mm by 6 mm PowerPAK SO-8L package with gullwing leads, but it also features best in […]
80 V RETs feature overhead to handle spikes and pulses
Nexperia announced the industry’s first 80 V RET (Resistor-Equipped Transistor) family. These new RETs or ‘digital transistors’ provide enough headroom for use in 48 V automotive board net (e.g. mild hybrid and EV cars) and other higher voltage circuits which are often subject to large spikes and pulses that previous 50 V parts cannot handle. […]
