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Archive for the ‘app notes’ Category

App note: Miniature, precision negative reference requires no precision resistors

Sunday, March 24th, 2019

App note from Maxim Integrated creating voltage negative reference from charge-pump inverter plus positive voltage reference combo. Link here (PDF) This application note discusses how to build a negative voltage reference without using external resistors or a negative supply by simply combining a simple charge-pump inverter and a positive output...

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App note: Simple test method for estimating the stability of linear regulators

Sunday, March 24th, 2019

Tips from ROHM Semiconductor to estimate the stability of linear regulator using simple step response method. Link here (PDF) Low drop-out (LDO) regulators developed back in the age when large-capacitance multi-layer ceramic capacitors (hereinafter, MLCCs) were uncommon cause a phase delay, leading to oscillation when connected to a low-ESR capacitor...

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App note: Understanding the safety certification of digital isolators

Saturday, March 23rd, 2019

This application note summarizes the international safety standards and certifications that apply to digital isolators. Link here Digital isolators provide signal isolation and the level shifting required for the correct operation of many circuits. Equally important, they insulate the user from electric shock. With basic human safety considerations so pertinent...

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App note: Reset and supervisor ICs – frequently asked questions

Sunday, March 17th, 2019

All about supervisor ICs FAQs from STMicroelectronics. Link here (PDF)

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App note: Receiving S/PDIF audio stream with the STM32F4/F7/H7 series

Sunday, March 17th, 2019

App note from STMicroelectronics about electrically connecting an external S/PDIF stream to an STM32 with an S/PDIFRX interface peripheral, Link here (PDF) The Sony/Philips Digital Interface Format (S/PDIF) is a point-to-point protocol for serial and uni-directional transmission of digital audio through a single transmission line for consumer and professional applications....

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App note: Addressing power supply challenges for after-market electronics and infrastructure

Saturday, March 16th, 2019

This application note discusses key market trends and customer needs that are presenting new challenges for power supply design for after-market technologies and transport infrastructure automation. This piece will also examine solutions to address these challenges, with a special emphasis on power architecture. Link here After-market automotive products have driven...

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App note: Bootstrap circuit in the buck converter

Sunday, March 10th, 2019

App note from ROHM Semiconductor about bootstrap capacitor used in switching regulator chip. Link here (PDF) This application note explains the step-up circuit using a bootstrap capacitor. In buck converters, this circuit is used when the highside switch is the N-ch MOSFET.

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App note: Linear regulator problem situations – Power supply does not start

Sunday, March 10th, 2019

App note from ROHM Semiconductor about various start up problem on 3 pins linear regulator. Link here (PDF) Although linear regulators can be used to easily configure power supplies, the linear regulators may cause startup problems depending on the type of loads. This application note introduces cases where the power...

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App note: Design considerations for a harsh industrial environment

Saturday, March 9th, 2019

This article discusses factors that influence the robustness of a circuit in a harsh environment, like you would find for industrial applications. The topics covered include ways to handle voltage transients and to protect against electrostatic discharge (ESD) and faults. Link here Semiconductor (IC) robustness—what is the operating temperature range? How...

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App note: MUX-friendly precision operational amplifiers

Sunday, March 3rd, 2019

Another App note from Texas Instruments on op-amp input safety from breakdown voltages during source switch-over. Link here (PDF) Multiplexing is a frequently used technique to perform data acquisition in multichannel systems with minimal signal-chain requirements. In this context, the role of the multiplexer (MUX) in an acquisition system is...

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App note: Precision current measurements on high-voltage powersupply rails

Sunday, March 3rd, 2019

Two methods for measuring current and what sense amplifier used are tackled in this app note from Texas Instruments. Link here (PDF) Current is a signal that can provide valuable insight into how a system is operating. Under defined conditions, the amount of current required to perform a task is...

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App note: IC temperature sensor accuracy compensation with a PIC microcontroller

Saturday, March 2nd, 2019

This application note is based on the analog output MCP9700/MCP9701 and serial output MCP9800 temperature sensors. Link (PDF)  here Microchip Technology Inc. provides a number of analog and serial output Integrated Circuit (IC) temperature sensors. Typically, these sensors are accurate at room temperature within one degree Celsius (±1°C). However, at hot...

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App note: Parallel crystal circuit input voltage control

Saturday, March 2nd, 2019

This application note is intended for use with all SMSC LAN products incorporating a parallel crystal circuit. The information contained in this application note provides one option to control the voltage across the input of the crystal circuitry. Link here The designer should incorporate the series resistor shown below in his...

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App note: Thermal consideration of flash LEDs

Sunday, February 24th, 2019

Pulsed LED application like flash LEDs requires adequate thermal management to counter the heavy heat caused by larger current, here's an app note from OSRAM discussing on thermal management of LEDs. Link here (PDF) This application note focuses on how to develop an adequate thermal management for LEDs in camera...

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App note: Dimming InGaN LEDs

Sunday, February 24th, 2019

App note from OSRAM on InGaN LEDs dimming method without penalty on its wavelength. Link here (PDF) While the InGaN technology produces the brightest light output across Blue, Deep blue, Verde, True green and White, it is important to understand that the wavelength of the light emitted depends on the...

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App note: Securing vibration motor leads and wires

Sunday, February 17th, 2019

App note from Precision Microdrives on how to properly connect wires on to vibration motors for reliability. Link here Vibration motors require electrical power, which must be delivered by wires or PCB tracks to the motor. Precision Microdrives vibrating motors are available in a range of connector forms. From stock,...

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App note: Vibration Motors – Voltage Vs Frequency Vs Amplitude

Sunday, February 17th, 2019

All about vibration motors and how its frequency and amplitude be controlled in this app note from Precision Microdrives. Link here We’re often asked how to adjust the vibration amplitude or frequency of our various vibration motors. In this article, we’ll look at how simple it is, why it can...

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App note: Ceramic resonators

Sunday, February 10th, 2019

All about ceramic resonators app note from Abracon. Link here (PDF) Why Ceramic Resonators? Ceramic resonators stand between quartz crystals and LC/RC oscillators in regard to accuracy. They offer low cost and high reliability timing devices with improved start-up time to quartz crystals.

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App note: MELF resistors – The world’s most reliable and predictable, high-performing film resistors

Sunday, February 10th, 2019

App note from Vishay on why MELF resistors are so successful and has no alternative in today's application. Link here (PDF) For more than 25 years, Vishay’s MELF resistors have successfully met the demanding requirements of the automotive industry. They offer superior SMD resistor performance in terms of accuracy, stability,...

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App note: Understanding the characteristics of Li-ion batteries and Richtek power management solutions

Sunday, February 3rd, 2019

App note from Richtek on how to work with Li-ion batteries properly. Link here Lithium-ion/polymer rechargeable batteries, which have been widely used today, have distinguished properties, but are very delicate and have to be used with extreme care. Improper use of Li-ion batteries will bring about catastrophic consequences. The incidences...

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