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16 Dec 2014

LT8640

by Susan Nordyk @ edn.com:

Leveraging Linear Technology’s Silent Switcher architecture and spread- spectrum frequency modulation, the LT8640 synchronous step-down switching regulator reduces EMI/EMC emissions by more than 25 dB—even with switching frequencies in excess of 2 MHz—enabling the part to easily pass automotive CISPR25, Class 5 peak limits. Synchronous rectification achieves efficiency as high as 95% with a switching frequency of 2 MHz, while the part’s 3.4-V to 42-V input range makes it useful for both automotive and industrial applications.

Step-down switching regulator minimizes EMI/EMC - [Link]

9 Dec 2014

640px-LedStepUpCircuit

by hackerspace-ffm.de:

Build a cheap and simple full software controlled step-up (boost) converter to drive a LED string of 10 LEDs. LEDs are used as string to light up a acrylic engraved plate placed in a holder (also made out 5 layers of lasered black acrylic glas). Step up is from 5V to about 30V, current regulated to about 20mA.

LED step-up converter with ATtiny85 - [Link]

8 Dec 2014

4623

Linear Technology has squeezed a 3A voltage regulator into a package measuring just 6.25mm square and 1.8 mm high. The complete LTM4623 circuit only requires one input capacitor and one output capacitor, a resistor to set Vout and a small capacitor for Vout tracking and soft-start. At just 1.8mm height the regulator can be mounted on the PCB reverse side.

LTM4623 – Ultrathin 20VIN, 3A Step-Down DC/DC μModule Regulator - [Link]

4 Dec 2014

article-2014december-the-difference-between-fig7

By Steven Keeping @ digikey.com:

Switching DC-DC voltage converters (“switching regulators”) offer some key advantages over linear regulators. Chief among these are efficiency and flexibility; switching regulators can step-up (boost), step-down (buck), and invert voltages with ease. Contemporary modular chips are compact, reliable, and available from multiple suppliers (see the TechZone article “Understanding the Advantages and Disadvantages of Linear Regulators” for a full comparison between switching and linear regulators).

However, this flexibility comes at the expense of increased complexity. For an engineer familiar with the elegance of a linear regulator, designing a power supply based around a switching device can be a little daunting. The key to overcoming the challenge is an understanding of what is going on inside that little black chip.

The Difference Between Switching Regulator Continuous and Discontinuous Modes - [Link]


3 Dec 2014

32050

by linear.com:

The LT®8613 is a compact, high efficiency, high speed synchronous monolithic step-down switching regulator that consumes only 3μA of quiescent current. Top and bottom power switches are included with all necessary circuitry to minimize the need for external components. The built-in current sense amplifier with monitor and control pins allows accurate input or output current regulation and limiting. Low ripple Burst Mode operation enables high efficiency down to very low output currents while keeping the output ripple below 10mVP-P. A SYNC pin allows synchronization to an external clock.

LT8613 – 42V, 6A Synchronous Step-Down Regulator with Current Sense - [Link]

2 Dec 2014

3790

by Susan Nordyk @ edn.com

Based on a four-switch single-inductor architecture, the LT3790 synchronous buck-boost DC/DC controller from Linear Technology accommodates an input of 4.7 V to 60 V and delivers up to 250 W of continuous power for use in a variety of automotive and industrial applications. The device operates from input voltages above, below, or equal to the output voltage, making it well-suited for automotive designs where the input voltage can vary dramatically during stop/start, cold crank, and load dump.

LT3790 – 60V Synchronous 4-Switch Buck-Boost Controller - [Link]

2 Dec 2014

3807Col

by linear.com:

The LTC®3807 is a high performance step-down switching regulator DC/DC controller that drives an all N-channel synchronous power MOSFET stage. A constant frequency current mode architecture allows a phase-lockable frequency of up to 750kHz.

The 50μA no-load quiescent current extends operating run time in battery-powered systems. OPTI-LOOP® compensation allows the transient response to be optimized over a wide range of output capacitance and ESR values. The LTC3807 features a precision 0.8V reference and power good output indicator. A wide 4V to 38V input supply range encompasses a wide range of intermediate bus voltages and battery chemistries. The output voltage of the LTC3807 can be programmed between 0.8V to 24V.

LTC3807 – 38V Micropower Synchronous Buck Controller with VOUT to 24V - [Link]

21 Nov 2014

XCL219_220

by elektor.com:

This tiny step-down converter chip measuring just 2.5 x 2.0 x 1.0 mm contains an integrated coil and can handle an output current up to 1 A. The XCL210/XCL220 are a new family of step-down micro DC/DC converters which have been specifically designed to minimize unwanted EMI emissions. This makes them particularly suited for use in small-scale RF applications. The design shows good efficiency and stable output with a peak ripple voltage of less than 10 mV.

Tiny Torex DC/DC Converter - [Link]

18 Nov 2014

Figure 2x600

by Haifeng Fan @ edn.com:

Isolated DC/DC converters are required in a broad range of applications including power metering, industrial programmable logic controllers (PLCs), insulated-gate bipolar transistor (IGBT) driver power supplies, industrial fieldbus, and industrial automation. These converters often are used to provide galvanic isolation, improve safety, and enhance noise immunity. Moreover, they can be used to generate multiple output voltage rails including dual-polarity rails.

Understanding isolated DC/DC converter voltage regulation - [Link]

17 Nov 2014

od_3034_1_1415045541

by NXP:

The NXP Flyback SMPS Design Tool helps you design flyback power supplies using NXPs TEA1721, TEA1723, TEA1733 and TEA1738 family. The TEA1721(A, B, D, F) family, the TEA1723(A, B, D, F) family, the TEA1733(A, B, C, M, L) family and TEA1738(F, G, L) family are low cost Switched Mode Power Supply (SMPS) controller IC’s intended for flyback topologies.

The latest update of the tool combines the TEA172x family and the TEA173x family into one tool. It comes along with a new style and an improved flow. Now it is also possible to export all design parameters, results and graphs automatically into an Excel sheet for post-processing or presentation purposes. Furthermore the database of transformer cores is extended.

Flyback SMPS Design Tool - [Link]



 
 
 

 

 

 

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