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| 2.5-A Step-Down Regulator Keeps EMC/EMI Emissions Low Analog Devices has announced the LTM8065, a µModule (power module) step-down regulator with up to 40 V input voltage (42 V abs max), which can safely operate from unregulated or fluctuating 12 V to 36 V input supplies in noisy environments such as industrial robotics, test and measurement, medical, factory automation, and avionic systems. The Silent Switcher architecture minimizes EMC/EMI emissions, enabling the LTM8065 to pass CISPR 22 class B for use in noise-sensitive signal processing applications including imaging and RF systems.  The LTM8065's small 6.25 mm x 6.25 mm x 2.32 mm BGA package includes a switching regulator controller, power switches, inductor and other supporting components. With only two 0805 sized capacitors and two 0603 sized resistors, the LTM8065's solution occupies approximately 100mm², about half the size of equivalent power level module solutions. Murata Expands Switching Regulator DC/DC Converter Family Murata has added a 12 V model to its OKI-78SR series of non-isolated switching regulator DC/DC power converters for embedded applications. The fixed single output converter offers both tight regulation and high efficiency directly at the power usage site and is a direct plug-in replacement for TO-220 package 78xx series linear regulators. Rated at 12V/1A, when powered from a 24 V source, the OKI-78SR-12/1.0-W36-C converter's efficiency is a very high 95%, eliminating the need for a heatsink that adds cost and increases complexity in the design and manufacturing processes. Cleverly packaged in the form of a three-terminal 78xx linear regulator, the converter operates from a source voltage of 15 V to 36 V and is available in both vertical and horizontal mounting options. The package size is just 10.4 x 7.62 x 16.5mm (0.41 x 0.3 x 0.65 inches). |
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Texas Instruments has introduced a 16-V input, 40-A synchronous DC/DC buck converter with an internally compensated advanced-current-mode (ACM) control topology supporting frequency  synchronization. TI's TPS543C20 SWIFT converter provides enhanced efficiency by integrating its latest generation of low resistance high- and low-side MOSFETs into a thermally efficient small-footprint package. Designers can stack two converters side by side to drive loads up to 80 A for processors in space-constrained and power-dense applications in various markets, including wired and wireless communications, enterprise and cloud computing, and data storage systems. The internally compensated ACM control topology with fast transient response maintains stability over a wide range of input and output voltages. What makes ACM different is that it is an emulated peak-current-mode control topology that internally generates a ramp with the ability to dynamically adjust for stability over a wide range of operating switching frequencies. This provides the best of both traditional fixed frequency for low noise operation and constant on-time (COT) control for fast transient without external compensation. CONTINUE READING
Win a Free Book: ADuC841 Microcontroller Design Manual!  This week's newsletter raffle is for a fantastic and informative book: ADuC841 Microcontroller Design Manual by Shlomo Engelberg, Normally $35, it delivers a comprehensive guide to designing and programming with Analog Devices' ADuC841 microcontroller and other microcontrollers in the 8051 family. Drawing ends at midnight this Friday. And congratulations to last week's raffle winner, Brian M., who won a a 2016 archive CD of Circuit Cellar. Thanks to all who participated! |
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For nearly 30 years, Circuit Cellar has built a reputation as the leading technical resource for professional engineers. Today the magazine has a new Editor-in-Chief (Jeff Child), a fresh look and expanded coverage  putting today's key technologies in context. We'll delve into critical trends in technologies such as microcontrollers, analog ICs, and embedded boards, but also feature in-depth stories exploring how other like-minded engineers applied those technologies to their product designs. Today we're making the October 2017 issue of Circuit Cellar available as a sample issue. In it, you'll find a rich variety of the kinds of articles and information that exemplify a typical issue of the current magazine. Don't miss out on upcoming issues of Circuit Cellar. Click Here and subscribe today! TDK has announced the KAS series AC-DC power supplies, rated at 2 W and 4 W. Accepting a very wide 90 Vac to 305 Vac, 47 Hz - 440 Hz input, these board mounted converters will operate from 115 V, 230 V, and 277 V nominal inputs. Target applications include security systems, building automation, professional household appliances, portable equipment, and products requiring a separate standby  voltage. The series has a double insulated Class II construction, requiring no earth ground connection and has a 3,000 Vac primary to secondary isolation. Available output voltages are 3.3 V, 5 V, 8 V, 9 V, 12 V, 14 V, 15 V, and 24 V and have a no-load power consumption of less than 300 mW. The KAS units are encapsulated in a plastic resin fiberglass case, providing additional protection against shock and vibration. The 2W KAS2 measures 28.5 x 25.8 x 17.0 mm and the 4W KAS4 is 37.0 x 27.5 x 17.5 mm.
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