App note: Driving brushless long-life vibration motors

App note from Precision Microdrives on new brushless motor design and how to drive them efficiently. Link here For a long time, all motors driven by DC supplies relied on using metal or carbon brushes to provide electrical power to the motor’s internal components. Meanwhile, in larger motor designs it has also been possible for […]

App note: Using SPICE To model DC motors

App note from Precision Microdrives helping you model DC motors in SPICE. Link here SPICE (Simulation Program with Integrated Circuit Emphasis) is an open-source program for simulating electrical circuits. It enables engineers to model the behaviour of their circuits in software, which reduces prototyping costs and time. As DC motors have mechanical properties – i.e. […]

App note: High-side current sensing for applications using high common-mode voltage

App note from STMicroelectronics. Link here (PDF) This application note explains how to extend the common input voltage range of a standard operational amplifier (op amp) to realize a high-side current sensing.

App note: Introduction to comparators, their parameters and basic applications

App note from STMicroelectronics about comparators and their limitations, also info on substitution depending on the application. Link here (PDF) After operational amplifiers (op amps), comparators are the most generally used analog, simple integrated circuits. Operational amplifiers are well described in many publications and a lot of information can be found regarding the design and […]

App note: Power inductors 101

App note from Vishay about how modern power inductors are made and their performance. Link here (PDF) Power inductors are typically used for energy storage in DC/DC converters or high current noise filter applications, including motor speed control, adjustable lighting, DC power conditioning, and more. Power inductors can be divided further into two groups – […]

App note: Inductors as RF chokes

App note from Coilcraft on how inductors where used for solving RF isolation issues. Link here (PDF) Many consumer products communicate with each other over broadband networks. From television to fiber transmission networks, the bandwidth of data communication is increasing, and the integrity of RF signals has become a major design concern. This paper provides […]

App note: Measuring self resonant frequency

App note from Coilcraft on determining the self resonant of an inductor and how to compare them to other identical inductors. Link here (PDF) When comparing published electrical values, engineers require a common basis for comparison. Ideally, a 100 nH inductor with a self resonant frequency (SRF) of 1 GHz from one manufacturer is equivalent […]

App note: Utilizing the power shutdown capabilities of the Kionix tri-axis accelerometers

Conserve power on using accelerometers with the help of this app note from Kionix by shutting it down on specific operating duty cycle. Link here (PDF) Kionix tri-axis accelerometers feature a power shutdown capability. Even with their typically low current draw, there are still applications that may require even less power consumption. For these applications, […]

App note: Multiplexing Tri-Axis accelerometer outputs

App note from Kionix on reading multiple accelerometer by a single ADC using off the shelf chip or accelerometer built-in multiplexer. Link here (PDF) A Kionix tri-axis accelerometer with analog outputs provides three output voltages (Xout,Yout, Zout) which are proportional to the respective accelerations in those directions. However, with three analog outputs to digitize, it […]

App note: Smart battery charger by LPC845 with SMBus interface

Battery charger using NXP’s LPC845 through SMBus communication. Link here (PDF) Batteries are used everywhere, such as smart phones, notebook computers, wearable devices, handheld electronic products, smart small appliances, etc. Users always want to know the battery temperature, voltage, current, capacity, how long it can be fully charged, and how long the battery will be […]

App note: Low-Power Real-Time algorithm for metering applications

Tested algorithm library from NXP Semiconductors on power metering. Link here (PDF) High accuracy metering is an essential feature of an electronic power meter application because inaccurate metering can result in substantial amounts of lost revenue. Moreover, inaccurate metering can also undesirably result in overcharging to customers. The common sources of metering inaccuracies, or error […]

App note: Loudspeaker characterization and compensation

Using DSP and ST’s Tune software to compensate for a flatter response on speakers discussed in this app note from ST Microelectronics. Link here (PDF) The application note describes how to measure and analyze the performance of a loudspeaker and how to compensate the frequency response using the ST Speaker Tune software, a tool available […]

App note: Pre-amplifying the analog output of a MEMS microphone

Designing pre-amp for MEMS microphone found in this app note from ST Microelectronics. Link here (PDF) This application notes describes the key parameters related to pre-amplification of the output signal of an analog MEMS microphone (MP23AB02B). A solution is proposed based on the TS971 op amp. For a differential output configuration, we can consider using […]

App note: The importance of compensation capacitors on the eFuse power line

Inductive spike on voltage rails causes eFuse to shutdown, here’s an app note from ON Semiconductors on how they solve this problem from happening. Link here (PDF) ON Semiconductor produces a wide variety of silicon based protection products including current limiting devices such as Electronic Fuses (eFuses). During an over−current stress, eFuses can limit the […]

App note: eFuse reverse voltage protection

App note from ON Semiconductors about eFuses’ ability to block reverse voltage. Link here (PDF) One area in which they (eFuses) differ in performance is reverse polarity protection. While a TVS device and polyfuse will protect against reverse voltages, the nature of an integrated semiconductor device does not inherently allow for this type of protection. […]

App note: Implementation of error code correction in EEPROMs

App note from ON Semiconductors about their EEPROM error correction. Link here (PDF) Some of ON’s automotive EEPROMs, like the Grade 0 NV25xxx family (SPI, 1 – 64 Kb) and the Grade 1 CAV24Cxx / CAV25xxx (Grade 1, 128 Kb and higher) implement an Error Code Correction scheme. What this means is that for each […]

App note: Revolutionizing analog to digital conversion

App note from ON Semiconductors introducing their nano power ADC NCD9801x. Link here (PDF) The NCD9801x ADC is a differential 12−bit resolution successive approximation register analog−to−digital converter unlike any other SAR ADC available on the market. It uses an innovative design to keep a low input capacitance of 2 pF, easily besting the typical SAR […]

App note: Applications of current DACs

App note from Maxim Integrated about current DACs and their uses. Link here The worldwide use of the electronic devices creates high demands for DACs to connect digital systems to the analog world such as the fiber optical communication networks, to bias photo diodes or to digitally control analog devices such as power supplies to […]

App note: Design and application guide of bootstrap circuit for high-voltage gate-drive IC

A deeper dive into controlling gates of MOSFETs with boostrap circuits talked in this app note from ON Semiconductors. Link here (PDF) The purpose of this paper is to demonstrate a systematic approach to design high−performance bootstrap gate drive circuits for high−frequency, high−power, and high−efficiency switching applications using a power MOSFET and IGBT. It should […]

App note: Understanding eFuse input voltage transients from hot plug events

App note from ON Semiconductors about things to look for when hot plugging eFuses. Link here (PDF) System designers must account for voltage surges that occur when supplies or loads are connected. eFuses are integrated circuits with many features to protect loads from these surges. However, it is important to ensure that the eFuse itself […]