App note: Automatic AC line voltage selector

Implementation of automatic AC line voltage selector, App note from Littelfuse. Link here (PDF) In some cases, appliances and equipment are able to operate when supplies by two different levels of AC line voltage to their main terminals (10V or 240V). This is why, it is very common that appliances and equipment have mechanical selectors […]

App note: P-channel power MOSFETs and applications

Another app note from IXYS on P-Channel power MOSFET application. Link here (PDF) IXYS P-Channel Power MOSFETs retain all the features of comparable N-Channel Power MOSFETs such as very fast switching, voltage control, ease of paralleling and excellent temperature stability. These are designed for applications that require the convenience of reverse polarity operation. They have […]

App note: Parallel operation of IGBT discrete devices

Guidelines for parallel operation of IGBT devices discuss in this app note from IXYS. Link here (PDF) As applications for IGBT components have continued to expand rapidly, semiconductor manufacturers have responded by providing IGBTs in both discrete and modular packages to meet the needs of their customers. Discrete IGBTs span the voltage range of 250V […]

App note: Probing oscillator output

This application note from SiTime gives practical guidelines for the effective probing of oscillator output, shows common mistakes and explains how to identify and avoid potential probing issues. Link here (PDF) Electrical engineers often use oscilloscopes for purposes ranging from checking simple, lowspeed digital signals to accurate waveform and jitter measurements. They need to use […]

App note: Definitions of VCXO specifications

App note from SiTime about Voltage controled crystal oscillator (VCXO) specification, Link here (PDF) VCXO are frequency control devices that allow change of output frequency as their input voltage varies. In selecting a VCXO for any application, a number of device performance specifications must be considered. This application note attempts to clarify the key VCXOspecific […]

App note: Integrated supercapacitor charger

Application circuit of supercapacitor ENYCAP(TM) power management from Vishay. Link here (PDF) The MAL219699001E3 demonstration circuit is a fully transparent power management solution with a regulated 2 W output and integrated power backup. It provides a DC/DC regulator with a wide power input range from 4.0 V to 20 V and adjustable regulated output between […]

App note: Design of a 100W active clamp forward DC-DC converter for telecom systems using the NCP1562

Another DC-DC converter design using ON Semiconductor’s NCP1562 PWM Controller. Link here (PDF) The NCP1562 PWM controller contains all the features and flexibility needed to implement an active clamp forward dc−dc converter. This IC operates from an input supply up to 150 V, thus covering the input voltages usually found in telecom, datacom and 42 […]

App note: Power-handling capabilities of inductors

App note from Coilcraft on how to calculate the power dissipation of an inductor. Link here (PDF) Inductors are not typically rated by power, however an approximation of the power-handling capability of an air core or ceramic core chip inductor can be estimated using the data sheet specifications for current and resistance.

App note: Driving multiple loads with 32 kHz Nano-Power MEMS oscillators

Accomodating multiple loads from a single oscillator output discussed in this app note from SiTime. Link here (PDF) Optimizing board space and managing power consumption of wearable devices is critical in sustaining competitiveness within this fast growing consumer segment. With less power consumed, battery life is extended or provides the option to reduce the battery […]

App note: Tilt-Sensing with Kionix MEMS accelerometers

Kionix low-g acceloreometers used as tilt-sensor. Link here (PDF) Accelerometers have countless potential tilt-sense applications in today’s motion-enabled world. Tilt-sensing opportunities exist in a variety of industries, such as automotive, consumer electronics and military/aerospace, and include: • Vehicle stability systems • Inclinometers • Cell phone/PDA screen navigation • Motion-enabled game play • Tilt-enabled computer mouse/pointer […]

App note: Addressing floating inputs in digital systems (Bus Hold)

White paper from Nexperia about their bus hold tech. Link here (PDF) In the normal operations of a digital system, the input to any digital device within is clearly defined – it is either one or zero. There are however interface cases where outputs may be disabled that can result in floating inputs.

App note: PoE Powered Device (PD) rectifier bridge circuits

App note from ON Semiconductors regarding different bridge rectifier topologies and how to reduce power losses in these stages. Link here (PDF) Power over Ethernet (PoE) is a technology which allows power sourcing equipment (PSE) to safely transfer power to a powered device (PD) through an Ethernet cable. The majority of the power transferred to […]

App note: Stepper motor module solution kit for LV8702V motor driver

Easily develop a motor conptrol application using this kit from ON Semiconductors without special knowledge of motor driver specs. Link here (PDF) This kit provides an API function library for motor driver control designed to control the ON Semiconductor motor driver product (LV8702V) via the Arduino Micro microcomputer. It also provides a dedicated GUI for […]

App note: 18pF crystals may not oscillate with energy saving MCUs

App note from Abracon about problems due on large crystal capacitive loading on smaller sized MCUs. Link here (PDF) The 18pF plated Quartz Crystals may no longer be the ideal choice for a typical clocking circuit using an off-the- shelf MCU. As silicon geometries have shrunk over the last decade, the Pierce oscillator loop embedded […]

App note: PCB trace vs. chip antenna design considerations

Abracon lists the requirement which antenna type best fit to your application. Link here (PDF) The modern urban environment poses a challenge to high-speed designs involving Cellular, GNSS, WiFi/Bluetooth/BLE/ZigBee and LPWA protocols: the reflection, refraction, scattering, diffraction, polarization and absorption of signals necessitates highly efficient RF chains. Of all components in the chain, the antenna […]

App note: Cable compensation of a primary-side-regulation power supply

Another tech note from Richtek on power supply regulation with cable compensation. Link here Cable compensation has been used to compensate the voltage drop due to cable impedance for providing a regulated charging voltage in battery charger applications. This application note uses a novel cable compensation method, which called cable minus compensation, as an example […]

App note: Analysis of buck converter efficiency

Tech note from Richtek on buck converter profiling. Link here The synchronous buck circuit is wildly used to provide non-isolated power for low voltage and high current supply to system chip. To realize the power loss of synchronous buck converter and to improve efficiency is important for power designer. The application note introduces the analysis […]

App note: Nonideality of ground

Ground in PCB design, another app note about grounds from Renesas. Link here (PDF) Ground is supposed to be ideal. It should be a black hole for stray currents where the voltage is always zero. Unfortunately, those stray currents travel through some non-superconducting material, so small voltages arise. You may not notice small changes in […]