Categories

Archive for the ‘app notes’ Category

App note: Blood pressure monitor fundamentals and design

Sunday, November 11th, 2018

Application note from NXP on blood pressure monitor fundamentals using their medical oriented MCUs. Link here (PDF) Arterial pressure is defined as the hydrostatic pressure exerted by the blood over the arteries as a result of the heart left ventricle contraction. Systolic arterial pressure is the higher blood pressure reached...

Tags: , ,
Posted in app notes | No Comments »

App note: How to eliminate over stress of MOSFET during start-up of flyback converter

Sunday, November 11th, 2018

App note from Richtek about their embedded soft-start function to eliminate MOSFET stress. Link here Switching Power Supply, compared to Linear Power Supply, is widely used due to its advantages, such as small size, light weight, high efficiency, etc. Flyback Converter, one of the switching power supply topologies, is most...

Tags: , ,
Posted in app notes | No Comments »

App note: Common mode filter inductor analysis

Sunday, November 4th, 2018

App note from Coilcraft on the design and construction of common mode filter inductor. Link here (PDF) Noise limits set by regulatory agencies make solutions to common mode EMI a necessary consideration in the manufacture and use of electronic equipment. Common mode filters are generally relied upon to suppress line...

Tags: , ,
Posted in app notes | No Comments »

App note: How current and power relates to losses and temperature rise on inductors and transformers

Sunday, November 4th, 2018

Coilcraft's app note on temperature rise due to losses on inductors and transformers. Link here (PDF) Core and winding losses in inductors and transformers cause a temperature rise whenever current flows through a winding. These losses are limited either by the allowed total loss for the application (power budget) or...

Tags: ,
Posted in app notes | No Comments »

App note: How to use LEDs with supervisory ICs for undervoltage and overvoltage fault indicators

Sunday, October 28th, 2018

Another app note from MAXIM Integrated utilizing supervisory chip and LEDs to indicate voltage faults. Link here Traditionally, supervisory ICs have been used to monitor voltage rails for undervoltage faults (UV). When a supply rail falls below a set threshold, the system is held in reset using the reset output...

Tags: , ,
Posted in app notes | No Comments »

App note: How a SIMO PMIC enhances power efficiency for wearable IoT designs

Sunday, October 28th, 2018

App note from MAXIM Integrated on very compact PMIC using only single inductor to drive three independent switching regulators. Link here Small form factor and minimal power loss are key criteria for internet of things (IoT) hardware, particularly wearables. Meeting these criteria typically involves some tradeoffs. For example, to meet...

Tags: , , ,
Posted in app notes | No Comments »

App note: HT66FB574 single colour independent light streamer USB keyboard

Sunday, October 21st, 2018

Another app note from Holtek this time about their HT66FB574, a USB keyboard device that can support single color LED streamer. Link here (PDF) The video gaming industry is seeing continual increasing demand for multi-feature keyboards. These can include features such as keys with an individual LED which can display...

Tags: , , ,
Posted in app notes | No Comments »

App note: HT66FB574/572 colour effect USB mouse

Sunday, October 21st, 2018

App note from Holtek on using their HT66FB574/572 to develop color effect mice. Link here (PDF) Demands from the video gaming industry for different types of gaming mouse continue to expand. Adding a large number of RGB LEDs to the mice can produce different colours and brightness changes creating a...

Tags: , , ,
Posted in app notes | No Comments »

App note: Power battery charger application guidelines

Sunday, October 14th, 2018

App note from Holtek on smart battery chargers. Link here (PDF) Battery chargers usually are products which transfer alternating currents to low voltage direct currents and which are widely applied in various rechargeable battery application fields. According to different applications, battery chargers can be divided into two types, namely digital...

Tags: , ,
Posted in app notes | No Comments »

App note: I/O emulated UART baud rate calibration

Sunday, October 14th, 2018

Software/bitbang method of baud rate calibration for micro without built-in UART, App note from Holtek. Link here (PDF) Not every HOLTEK MCU contains a Universal Asynchronous Receiver/Transmitter function, otherwise known as a UART. If this function is required, it can be emulated using software. However, the software accuracy will change...

Tags: , , ,
Posted in app notes | No Comments »

App note: Minimizing light flicker in LED lighting applications

Sunday, October 7th, 2018

Another application notes from Richtek this time on LED lamps flickering. Link here Applying LEDs in offline retrofit lamps seems straightforward, but should be done with care to achieve similar light quality as the conventional lamp that the user is trying to replace. Light flicker is one of the aspects...

Tags: , ,
Posted in app notes | No Comments »

App note: Li-ion battery and gauge introduction

Sunday, October 7th, 2018

Richtek app note for Li-ion battery definitions and gauge introduction. Link here SOC is defined as the status of available energy in the battery and usually expressed as percentages. Because the available energy change depends on different charging/discharging currents, temperatures and aging effects, the SOC could be defined more clearly...

Tags: , , ,
Posted in app notes | No Comments »

App note: Light guides

Sunday, September 30th, 2018

Light guide basics app note from OSRAM. Link here (PDF) Light Guides are used wherever the light of a light source should be distributed homogeneously over a particular area, when there is a spatial distance between light source and the area which is to be illuminated.

Tags: , , ,
Posted in app notes | 1 Comment »

App note: LED diagnosis in automotive applications

Sunday, September 30th, 2018

App note from OSRAM about different approaches on LED string diagnostic in automotive. Link here (PDF) One requirement especially in automotive applications is the diagnosis of failures in functions and systems. Therefore light functions realized with LEDs like break light, daytime running light, low and high beam may require a...

Tags: , , ,
Posted in app notes | No Comments »

App note: Challenge and Response with 1-Wire® SHA Devices

Sunday, September 23rd, 2018

Another app note from Maxim Integrated about challenge-response security on 1-wire devices. Link here (PDF) Challenge-response can be a secure way of protecting access to any privileged material if implemented correctly. In this document, many options for challenge-response access control are discussed but the most secure method given is presenting...

Tags: , , ,
Posted in app notes | No Comments »

App note: Extending I2C communication distance with the DS28E17

Sunday, September 23rd, 2018

App note from Maxim integrated about alternative method to extend I2C bus. Link here (PDF) Systems are increasingly requiring greater distances for I2C buses. This article explains how the DS28E17 can be used to extend the distance of I2C devices while decreasing cost.

Tags: , ,
Posted in app notes | No Comments »

App note: Recommendations to avoid short pulse width issues in HVIC gate driver applications

Sunday, September 16th, 2018

Application note from ON Semiconductors discussing possible abnormalities on High voltage gate driver when operating on short pulses. Link here (PDF) The High−Voltage Integrated Circuit (HVIC) gate driver family is designed to drive an N−channel MOSFET or IGBT up to 600 V. One of the most common methods to supply...

Tags: , ,
Posted in app notes | No Comments »

App note: High voltage inverting buck reduces complexity and board space

Sunday, September 16th, 2018

App note from ON semiconductors about repurposing a buck converter to produce negative voltages. Link here (PDF) Applications in the electronics industry ranging from sensor−based designs to power amplifiers are periodically faced with the requirement to generate a negative voltage rail. Although many transformer−based designs, charge pumps and other methods...

Tags: , ,
Posted in app notes | No Comments »

App note: The reduction of input voltage spike on power switches

Sunday, September 9th, 2018

Another app note from Richtek introducing solutions for reducing the input voltage spike on power switches. Link here The power switch is a low voltage, single N-Channel MOSFET high-side power switch, optimized for self-powered and bus- powered Universal Serial Bus (USB) applications. In worse operating condition, an input voltage spike...

Tags: , ,
Posted in app notes | No Comments »

App note: Analyzing VIN overstress in power ICs

Sunday, September 9th, 2018

Investigative app note from Richtek about the component failure point caused by EOS. Link here (PDF) Failures in power ICs are often the result of Electrical Over Stress (EOS) on the IC input supply pin. This report explains the structure of power IC input ESD protection and how ESD cells...

Tags: , ,
Posted in app notes | No Comments »

Next Page »

Recent Comments

  • Crawford: Biscuits!
  • hli: Sunday++
  • Jack: Hello! Any board relating to LC filter circuits?
  • Fabien: PCB is life, life is PCB.
  • Kurt: We sleep safely at night because rough men stand ready to visit violence on those who would harm us. (Rough women, too.)