Tag Archives: app note

App note: Measuring inrush current

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Inrush current evaluation from Aimtec. Link here

In AC/DC power converters beyond a few watts, during the initial application of power an excessive inrush current will flow when the input capacitors are suddenly charged. If unhindered the inrush current can easily exceed 50 A at the peak of the AC cycle and severely stress the converter’s fuse and input rectifiers, thereby significantly reducing the reliability and life expectancy of the modules. Universal power supplies (supplies which accept a wide range of input voltages) are particularly susceptible to high inrush current since their input capacitors must be large enough to handle line voltages as low as 110 VAC, as well as voltages as high as 305 VAC at start-up. In these environments, a power-supply failure or a tripped circuit breaker can be inconvenient at best, and expensive or dangerous at worst.

App note: Adding flexibility by using multiple footprints for I2C™ serial EEPROMs

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Save PCB space by utilizing EEPROM SOIC-8 area, here’s an application note from Microchip. Link here (PDF)

For many years, the 8-lead SOIC package has been the most popular package for serial EEPROMs, but now smaller packages are becoming more commonplace. This offers a number of benefits; the reductions in footprint size and component height are some of the more obvious ones. Smaller packages also generally offer a cost advantage over their larger counterparts.

App note: Writing to flash and EEPROM on the tinyAVR 1-series

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Update your tinyAVR code to access memories when using 1-series tinyAVRs. Link here (PDF)

On tinyAVR® 1-series devices, access to Flash memory and EEPROM has been changed from that on previous tinyAVR devices. This means that existing code for writing to Flash and EEPROM on older devices must be modified in order to function properly on tinyAVR 1-series devices. This application note describes what has changed and how to adapt code to these changes.

App note: PWM Basics

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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.

App note: Microphone specifications explained

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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 be applied in unfamiliar ways. This application note explains the specifications and terms found in MEMS microphone data sheets so that the microphone can be appropriately designed into a system.

App note: High-Power backup

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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 wide range of backup function that is from low power for long time to high power for short time. And you can design Murata’s supercapacitors into your slim devices because of the thin thicknesses. In addition, because supercapacitors have longer cycle life than batteries, they have potential for maintenance free.