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App note: iCoupler® Isolation in CAN bus applications

Sunday, April 23rd, 2017

Application note from Analog Devices on CAN bus system isolation. Link here (PDF) The intention of this application note is to give the user a brief overview of the CAN bus protocol, focusing on the system physical layer, as well as an understanding of why isolation is so important to...

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App note: Safety considerations and layout recommendations for digital isolators

Sunday, April 23rd, 2017

Application note from Silicon Labs about end user safety against high voltage shock that are designed together with digital isolators. Link here (PDF) This application note details the creepage and clearance requirements of an isolator type component, such as a digital isolator, used to provide protection from electric shock. It...

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App note: Understanding undervoltage lockout in display power devices

Sunday, April 16th, 2017

Texas Instrument's application note about how undervoltage lockout (UVLO) protect devices from undefined behavior. Link here (PDF) Many integrated circuits include an undervoltage lockout (UVLO) function to disable the device at low supply voltages. Below the minimum supply voltage the function and performance of a device may be undefined, making...

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App note: Driving of OLEDs

Sunday, April 16th, 2017

Application note from OSRAM on driving OLEDs with constant current for longer operation. Link here The operation of OLEDs with electronic drivers is similar to anorganic LEDs for the most part. In a majority of applications, standard LED drivers may be used also for OLEDs. Nevertheless, there are some important...

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App note: Current sensing power MOSFETs

Sunday, April 9th, 2017

SENSEFET App note from ON Semiconductors incorporate a current sense inside a power MOSFET, these devices are straight forward calculating for sense resistance and voltage but have trade-offs for smaller current sensing. Link here (PDF) Current sensing power MOSFETs provide a highly effective way of measuring load current in power...

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App note: Load switches: What are they, why do you need them and how do you choose the right one?

Sunday, April 9th, 2017

Application report from Texas Instruments on load switches to simplify power supply design. Link here (PDF) Integrated load switches are electronic relays that can be used to turn on and turn off power supply rails in systems. Load switches offer many other benefits to the system and can include protection...

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App note: How to select the Triac, ACS, or ACST that fits your application

Sunday, April 2nd, 2017

Choosing the right AC switch for your application based on specification like current rating, voltage rating and triggering quadrant. Here's an app note from STMicroelectronics to guide you on selecting the right part. Link here (PDF) This document gives basic guidelines to select the AC switch device according to the...

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App note: A logic-level transient-voltage protected AC switch

Sunday, April 2nd, 2017

STMicroelectronics' AC switch directly controlled by microcontroller. Link here (PDF) Home appliances such as washing machines, refrigerators and dishwashers employ a lot of low power loads such as valves, door lock systems, dispensers or drain pumps. Since these loads are powered by the mains in ON / OFF mode, they...

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App note: Low-power battery temperature monitoring

Sunday, March 26th, 2017

Low current consumption temperature battery monitoring TMP303 from Texas Instruments. Link here (PDF) Charging a battery cannot be independent of temperature. In fact, most batteries specify a range of temperatures where charging is permitted. Charging outside these bounds risks damage, failure or worse. To prevent charging when the temperature is...

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App note: Stopping reverse current flow in standard hot swap applications

Sunday, March 26th, 2017

Application report from Texas Instruments about a simple circuit that blocks reverse currents. Link here (PDF) The proposed circuit uses an inexpensive operational amplifier to sense the condition of the output voltage exceeding the input voltage, and subsequently disable the hot swap controller, stopping the flow of reverse current (current...

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App note: Fast Rail-to-Rail operational amplifiers ease design constraints in low voltage high speed systems

Sunday, March 19th, 2017

Migration to lower rail voltages considerations on operational amplifier designs an Application note from Analog Devices. Link here (PDF) Movement towards lower power supply voltages is driven by the demand that systems consume less and less power coupled with the desire to reduce the number of power supply voltages in...

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App note: Resolution enhancements of digital potentiometers with multiple devices

Sunday, March 19th, 2017

An old application note from Analog Devices about configuring multiple digital potentiometers to improve resolution, accuracy and programming complexity might add-up to the mix though. Link here (PDF) Digital potentiometers usually come with standard resistance values of 10k, 100k, and 1MW at a given number of adjustable steps. If an...

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App note: Selecting coupled inductors for SEPIC applications

Sunday, March 12th, 2017

Application example from Coilcraft on how coupled inductors gain advantage over separately wound inductors, calculations included. Link here (PDF) The SEPIC (Single-Ended Primary Inductance Converter) topology is used in applications that require characteristics of both a buck and a boost regulator, specifically the ability to step up and step down...

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App note: Choosing inductors for energy efficient power applications

Sunday, March 12th, 2017

Designing efficient power converters guide from Coilcraft. Link here (PDF) In high frequency DC-DC converters, inductors filter out the AC ripple current superimposed on the DC output. Whether the converter steps the voltage down – buck – or steps the voltage up – boost – or both up and down...

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App note: ASIC fixes for noisy analog “Oops”

Sunday, March 5th, 2017

App note from Maxim Integrated about simple fixes that can solve most issues when designing with ASICs. Link here (PDF) Noise is a common problem in mixed-signal ASICs, degrading performance and jeopardizing the completion of products. This application note gives hints and tips for adding external circuits that make many...

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App note: Multiplex boosted class-D without additional external circuitry

Sunday, March 5th, 2017

An analog switch MAX14689 from MAXIM Integrated let signals that are higher than rail voltage pass. Link here (PDF) Boosted class-D amplifiers drive speakers with voltages greater than the supply voltage. These amplifiers are becoming more common because they allow higher performance audio from a single lithium ion battery. Most...

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App note: HT45F3420 LED flashlight application

Sunday, February 26th, 2017

Holtek's HT45F3420 MCU provide LED flashlight application all in with minimal external components. Link here (PDF) In traditional LED flashlight application circuits, the battery is used to directly drive the LED which will cause uneven brightness levels and the possibility of damaged LEDs due to changing battery conditions. Using the...

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App note: BH45F0031 Earphone jack communication

Sunday, February 26th, 2017

Holtek's App note about their audio to digital signal converter chip BH45F0031 that together with an phone app, communication via audio phone jack is possible. Link here (PDF) The BH45F0031 is a Flash type 8-bit high performance RISC architecture microcontroller, which is designed for smart phone headset interface applications that...

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App note: Charging batteries using USB power

Sunday, February 19th, 2017

Fairly old application note from MAXIM Integrated about getting out power from USB ports. Link here (PDF) Many devices with rechargeable batteries use USB power to recharge the batteries while they are connected. This application note describes the power available from USB and how it can be used to charge...

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App note: Improve flicker performance of direct AC driven LED fixtures with self valley fill

Sunday, February 19th, 2017

Application note from ON Semiconductors on LED lighting flicker caused by its own AC supply by adding an improved self valley fill circuit. Link here (PDF) To provide power to LED loads from AC input, SwitchMode Power Supplies (SMPS) are generally used since LED need to be driven by regulated...

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Recent Comments

  • hli: Sunday++
  • Max: Jolly good stuff, although the "include 100 W resistors in series with the inputs and outputs" part is quite hilarious until one realizes* they meant...
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