App note: Virtually increasing the number of serial communication peripherals in STM32 applications

App note from STMicroelectronics on possible alternate switching of channels to cater multiple communication routes. Link here (PDF) Application engineers often face the problem of limited number of serial communication peripherals of a microcontroller that, on the other hand fulfills all the other application requirements thanks to its features and performance. Sometimes they obviate by […]

App note: Power transistor safe operating area – special considerations for switching power supplies

App note from ON Semiconductors about less common transistors stresses when used on switching power supplies. Link here (PDF) The power transistor, in today’s switching power supply, exists in an environment which is quite hostile to semiconductors. Large currents, large voltages, high temperature, high frequency, and low impedance sources add up to something close to […]

App note: Bring a “CAN-DO” attitude to your industrial drone design

Tech note from Maxim Integrated on using the proven robustness of CAN Bus to drone’s internal parts communication. Link here (PDF) Providing predictable and error-free communications, CAN bus networks have been the workhorse of the automobile industry for over thirty years. However, they have recently found a new lease on life in other industrial applications, […]

App note: Automotive infotainment gesture control for the rest of us

Gesture recognition discussed in this tech note from Maxim Integrated. Link here (PDF) Infotainment gesture control enhances driver experience and safety by helping avoid distractions caused by fiddling with touchscreens and poorly located dials. Gesture recognition can complement touchscreens, voice, and knobs so that the driver can focus on the road. Time-of flight cameras, although […]

App note: High current LED capacitive drop drive

Fairly old app note from ON Semiconductors on using capacitors to drive LEDs off AC mains. Link here (PDF) This application note describes the basics for powering high current light emitting diodes (LEDs) utilizing a capacitive divider circuit off the AC mains. A linear regulator is used to control the LED current in order to […]

App note: A guide to choosing the right ultra low Iq low dropout linear voltage regulators

App note from ON Semiconductors that discuss tradeoffs between achivieng low quiescent current and good dynamic performance when choosing an LDO. Link here (PDF) One of the most important challenges today in designing electronic applications is to minimize the power consumption of the system. To accomplish this, most systems utilize various low power modes which […]

App note: Snubber design for noise reduction in switching circuits

Minimize noise by properly designing a snubber circuit in switching converters, app note from Alpha & Omega Semiconductor. Link here (PDF) In high frequency switching converters the designers face a common challenge of dealing with switching noise. In particular when the high side Mosfet turns on, the body diode of the low side FET, which […]

App note: Power MOSFET continuous drain current rating and bonding wire limitation

App note from Alpha & Omega Semiconductor about current limitations on MOSFETs with exposed pads. Link here (PDF) Power MOSFET datasheets will usually show maximum values for continuous drain current Id, on the first page of datasheets. For bottom exposed part such as DPAK, TO220, D2PAK, there is always a note besides Id rating saying […]

App note: Wireless gamepad solution based on LPC5528 and NxH3670

Application note from NXP Semiconductors introduces a wireless gamepad solution based on LPC5528 and NxH3670. Link here (PDF) LPC5528 is a Cortex®-M33 based microcontroller for embedded applications. It has two USB device controllers which are key peripherals for the gamepad solution: Full-speed USB and High-speed USB device controllers. All of these features make LPC5528 very […]

App note: Wi-Fi Alliance derivative certification process

App note from NXP giving you an overview of Wi-Fi Alliance certification program and step-by-step procedure of the Wi-Fi derivative certification process. Link here (PDF) Wi-Fi CERTIFIED™ is an internationally recognized logo of approval for products indicating that they meet the industry agreed standard for interoperability, security, quality and a range of application specific protocols. […]

App note: Proper resistance measurement test method for Bourns metal current sense

How to Measure low resistance accurately talked through in this white paper from Bourns. Link here (PDF) Resistance value measurement tests typically use standard multimeters with two measuring wires. This measurement method is suitable for resistance values higher than 10 ohms, but is more prone to inaccurate results when measuring lower resistance values. This is […]

App note: Advantages of sulfur-resistant film resistors

Special type of SMD resistors from Bourns that are resistant to most environmental pollution. Link here (PDF) In recent years, the long term reliability of film chip resistors in a high sulfur environment plays an increasingly important role in a wide range of market segments such as industrial electronics, IT systems and telecommunications. Sulfurous environments […]

App note: Precautions when measuring the rear of the package with a thermocouple on power devices

App note from ROHM Semiconductors when measuring thermals along exposed pads on power devices. Link here (PDF) When measuring the rear of the package with a thermocouple, to measure accurately, the thermocouple must be in close contact with the package. A thermal pad for heat dissipation is exposed on the rear side and this thermal […]

App note: LED electrostatic breakdown

Very brief reminder from ROHM semiconductors about LED electrostatic destruction. Link here (PDF) LED products are classified as having a lower electrostatic breakage resistance than other semiconductor products. InGaN devices used in blue and white LEDs are more vulnerable to static electricity than other InGaAlP and GaP (red to yellow-green) devices.

Lab power supply build using old power bricks

Building a lab power supply from old computer power bricks: Over the years, I have accumulated many used computer power bricks. Although I could just use them by themselves to power other electronics with similar voltage and current requirements, I thought I would combine a few of them together as the input to a linear […]

Reverse-engineering a low-power LED flasher chip

Ken writes, “How do you make an LED blink? A vintage way is the LM3909, a chip from 1975 that can flash an LED for a year from a single flashlight battery. This chip has some surprising features, such as a charge pump that lets you power a 2-volt LED from a 1.5-volt battery. This […]

App note: MOSFETs withstand stress of linear-mode operation

App note from IXYS talking about MOSFET operating in linear region in application like electronic load. Link here (PDF) Power MOSFETs are most often used in switchedmode applications where they function as on-off switches. But in applications like electronic loads, linear regulators or Class A amplifiers, power MOSFETs must operate in their linear region. In […]