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App note: PWM Basics

Sunday, January 14th, 2018

PWM basics and PWM drivers app note from APEX Microtechnology. Link here (PDF) PWM circuits are taking the same general course of development traveled by op amps and many other electronic functions. Concepts were brought to life using discrete components and were followed by modules, hybrids and then monolithics.

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App note: Microphone specifications explained

Sunday, January 14th, 2018

All about MEMS microphone from TDK Invensense. Link here (PDF) A MEMS microphone IC is unique among InvenSense, Inc., products in that its input is an acoustic pressure wave. For this reason, some specifications included in the data sheets for these parts may not be familiar, or familiar specifications may...

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App note: High-Power backup

Sunday, January 7th, 2018

App note from Murata on application of Electrical double layer capacitors (EDLCs). Link here (PDF) When you consider backup function in your product, Murata’s supercapacitors (also known as EDLCs, Supercaps) are suitable for backup energy device. Murata’s supercapacitors can discharge in high power up to 10A. Therefore they can cover...

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App note: Lithium Ion Capacitors: An Effective EDLC Replacement

Sunday, January 7th, 2018

Hybrid capacitor of EDLC and LIB, Lithium Ion capacitors from TAIYO YUDEN offers solution to conventional EDLC lesser characteristics. Link here (PDF) EDLCs were first created in Japan in the 1970s and began appearing in various home appliances in the 1990s. Since the 2000s, they have been used in mobile...

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App note: Capacitor selection guidelines on LDOs

Sunday, December 31st, 2017

They are different kind of capacitors, selection for one capacitor varies depending on application. A good read app note from Analog Devices. Link here (PDF) Capacitors are underrated. They do not have transistor counts in the billions nor do they use the latest submicron fabrication technology. In the minds of...

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App note: Linear regulators reverse voltage protection

Sunday, December 31st, 2017

Various input and output reverse voltage protection method for linear regulators discussed in this app note from ROHM. Link here (PDF) A linear regulator integrated circuit (IC) is a DC-to-DC buck converter system that reduces a DC supply from higher voltage level to a lower voltage level, thus it requires...

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App note: Power source ON/OFF characteristics for linear regulator

Sunday, December 24th, 2017

A good read app note from ROHM on linear regulator On and Off characteristic. Link here (PDF) When a linear regulator IC is turned ON, the electric charge is stored in the output capacitor and the output voltage increases up to the specified value. At this time, an inrush current...

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App note: Application of SiC MOSFETs

Sunday, December 17th, 2017

App note from ON Semiconductors about Silicon Carbide MOSFETs, their difference and gains over Silicon MOSFETs. Link here (PDF) Among the Wide Band Gap materials silicon carbide (SiC) is by far the most mature one. The raw wafer quality has greatly improved over the last years with significant reduction of...

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App note: Workflow for an IoT product

Sunday, December 17th, 2017

ON semiconductor's IoT device development process. Link here (PDF) In this application note a complete list of process steps is described in order to develop a specific system in the IoT environment. In order to make the description more practical the PIR sensor alarm example is used.

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App note: Choose the right power supply for your FPGA

Sunday, December 10th, 2017

Designing a power supply for FPGA includes multiple voltage, ripple management and power sequencing, here's an app note from Maxim Integrated. Link here (PDF) Field-programmable gate arrays (FPGAs) and complex programmable logic devices (CPLDs) require 3 to 15, or even more, voltage rails. The logic fabric is usually at the...

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App note: Current-sense amplifier doubles as a high common mode instrumentation amplifier

Sunday, December 10th, 2017

Application note from Maxim intergrated on utilizing a boost converter and a current-sense amplifier to form a regulator that derives +5V from -48V without isolation. Link here (PDF) Instrumentation amplifiers (IAs) are used where gain accuracy and dc precision are important, such as in measurement and test equipment. The downside...

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App note: Current sensing in metering applications using a pulse current sensor and ST metering devices

Sunday, December 3rd, 2017

App note from STMicroelectronics about current sensing using Rogowski coil together with STPMxx metering device. Link here (PDF) This application note describes the benefits of a current sensing system for metering applications using STPMxx metering devices and a current sensor developed by Pulse Engineering Inc. (hereafter referred to as “Pulse...

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App note: Watt-hour meter based on the STM32F101 microcontroller

Sunday, December 3rd, 2017

ARM Microcontroller based watt-hour meter implementation from STMicroelectronics. Link here (PDF) This document describes, in detail, the hardware and software implementation of a watthour meter using the STM32F101 microcontroller. This cost effective watt-hour meter uses shunt with an operational amplifier as a current sensor, an embedded 12-bit ADC for current...

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App note: Thermal design calculations for integrated stepper motor driver solutions

Sunday, November 26th, 2017

Another technical note from STMicroelectronics on fine tuning motor drivers for optimal thermal design. Link here (PDF) One constant trend in the automotive world is the tendency to reduce the size of electronic components and the ECUs (Electronic Control Unit). While this development has many benefits for the car manufacturer...

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App note: Pop & click in audio amplifiers

Sunday, November 26th, 2017

Technical note from STMicroelectronics about popping noise usually heard on audio amplifiers and how to minimize it. Link here (PDF) Pop and click, or rather, the absence of it, is a characteristic that makes a lot of impact in the world of audio amplifiers. This is especially true for those...

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App note: Characteristics and applications of fast recovery epitaxial diodes (FRED)

Sunday, November 19th, 2017

All about ultrafast diodes app note from IXYS. Link here (PDF) During the last 10 years, power supply topology has undergone a basic change. Power supplies of all kinds are now constructed so that heavy and bulky 50/60 Hz mains transformers are no longer necessary. These transformers represented the major...

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App note: Optimized diodes for switching applications

Sunday, November 19th, 2017

An app note from IXYS about choosing the right diode for efficiency and cost. Link here (PDF) Great efforts have been made to improve power switches – MOSFETs and IGBTs – to decrease forward voltage drop and as well as to decrease turn-off energy. In switching inductive loads, the turn-on...

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App note: Adjustable gain with a current sensing

Sunday, November 12th, 2017

Application note from STMicroelectronics for fine tuning gain on current sensing amplifier. Link here (PDF) This application note explains how to use current sensing amplifiers with series resistors on the sense inputs. This approach is especially useful for applications where the gain must be adjusted.

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App note: Intelligent power switches for 48 V battery applications

Sunday, November 12th, 2017

Application note on controling Intelligent Power Switches (IPS) from STMicroelectronics. Link here (PDF) For the last 15-20 years, the automotive electronics market has been moving from electromechanical relays to solid state components for driving all kind of loads. It is obvious why: solid state components are smaller in size, lighter,...

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App note: Position sensing technologies in automotive applications

Sunday, November 5th, 2017

An Autopad(TM) sensor from TT Electronics provides a new non contact position sensing. Link here (PDF) Automotive design engineers are continuously seeking components that offer performance and flexibility beyond those of conventional position sensing technologies. Further still are the requirements that these devices be versatile and adaptable to a wide...

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