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 […]

App note: DC-to-DC design guide

DC-DC converter design guide from Vishay. Link here (PDF) Manufacturers of electronic systems that require power conversion are faced with the need for higher-density dc-to-dc converters that perform more efficiently, within a smaller footprint, and at lower cost despite increasing output loads. To meet these demands, Siliconix has combined advanced TrenchFET and PWM-optimized process technologies, […]

App note: Torque recommendations for TO-220 devices

App note from Vishay on the impact of torque on thermal resistance of TO-220 devices. Link here (PDF) When the TO-220 was first introduced, most applications required something less than the full power handling capabilities of this package. Hence, the TO-220 is almost taken for granted in terms of its excellent power handling capacity and […]

App note: USB hardware and PCB guidelines using STM32 MCUs

Peripheral USB on STM32 MCUs app note from STMicroelectronics. Link here (PDF) STM32 microcontrollers include a group of products embedding a USB (Universal Serial Bus) peripheral. Full-speed and high-speed operations are provided through embedded and/or external PHYs (physical layers of the open system interconnection model). This application note gives an overview of the USB peripherals […]

App note: USB Type-C™ power delivery using STM32xx series MCUs and STM32xxx series MPUs

Guideline from STMicroelectronics on the basics of the two new USB Type-C™ and USB Power-Delivery standards. Link here (PDF) This new reversible USB Type-C™ connector makes plug insertion more user friendly. The technology offers a single platform connector carrying all the necessary data. Using the power delivery protocol, it allows negotiation of up to 100 […]

App note: Low ESR tantalum capacitors make a difference in circuit designs

App note from Vishay about how ESR in tatalum capacitors affect circuit performance. Link here (PDF) When choosing a capacitor for any application, there are a few key characteristics that must be understood in order to analyze its suitability for the circuit. In a simple capacitor equivalent circuit model, there are three key characteristics that […]

App note: The benefit of using a three sense pin design on battery

App note from Vishay about correcting error when reading current on small valued shunt resistor using third pin. Link here (PDF) The low values of battery shunts being produced today necessitate the use of precision analog to digital converters (ADCs) to interpret the voltage drop across the shunt’s element. Many of these precision ADCs require […]

App note: Bad block information introduction

App note from Macronix all about NAND flash bad blocks management. Link here (PDF) Today, NAND flash is used in many fields, such as consumer, industrial, and automotive. Compared with NOR flash, NAND flash has the advantage of availability at higher densities and lower cost per bit. However, NAND flash has the disadvantage of requiring […]

App note: Enhancing system security with Macronix(TM) flash

Technical note from Macronix about built-in and hardware security strategies on their flash memories. Link here (PDF) Attacks on a system typically alter or copy the content of the Flash image for three primary reasons, which are to: operate the system in an unauthorized manner with the purpose of committing fraud against the user or […]

App note: A sensible 30A energy meter

Technical paper from Analog Devices about wide range energy meter LTC2947 that eliminates the need for unique and expensive sense resistor values. Link here (PDF) Monitoring energy has similar benefits in many applications, not just solar. Handheld, rack-mounted and in-line energy meters are widely available and can be used by people such as facility managers […]

App note: Achieving a stable power supply with fast transient response through digital control

Technical white paper from Renesas on using digital control loop to achieve more stable power supply. Link here (PDF) New trends and changing requirements in the power management industry influence how we design power supplies. Some, like the need for telemetry and system information, are more recent due to advancements in technology. Others, like the […]

App note: Monitoring additional supplies with the ADM1062–ADM1069 super sequencers

App note from Analog Devices about ways to extend capabilities of their ADM106x supply supervisor and sequencer chip. Link here (PDF) The ADM1062–ADM1069 Super Sequencers accurately monitor a number of input rails. The ADM1062–ADM1067 have 10 input pins dedicated to monitoring (VH, VP1 to VP4, VX1 to VX5) and the ADM1068 and ADM1069 have eight […]