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App note: Interfacing to analog switches: Driving the control input of an analog switch with 1.8 V or lower − Is it safe?

Sunday, May 21st, 2017

ON Semiconductor's analog switches let you drive with an input control voltage lower than Vcc. Link here (PDF) Analog switches are everywhere today. Due to their small size and low current consumption, they are popular in portable devices where they are effective in a variety of subsystems including audio and...

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App note: Consideration of self-pollution reduction for electronic systems

Sunday, May 21st, 2017

App note from ON Semiconductors discussing how locally generated EMI affects its own system and how to prevent it. Link here (PDF) This application note will address the problem of Electro Magnetic Interference (EMI) self pollution in which one part of an electrical systems such as cell phones and consumer...

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App note: Active capacitor discharge circuit considerations for FPGAs

Sunday, May 14th, 2017

Power down sequencing and discharging on FPGAs app note from Diodes Incorporated. Link here (PDF) FPGA’s need the different power rails to be powered up and down in a defined sequence. For power down, each sequenced rail needs to be fully off before the next rail is turned off. With...

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App note: Power supply rejection for low-jitter clocks

Sunday, May 14th, 2017

Method of rejecting noises from power supply, an app note from Silicon Labs. Link here (PDF) Hardware designers are routinely challenged to increase functional density while shrinking the overall PCB footprint of each new design. One significant challenge is minimizing clock jitter through careful board design while meeting the design's...

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App note: Nonvolatile STANDBY/ON Switch

Sunday, May 7th, 2017

Power status recovery in this application note from Maxim Integrated. Link here (PDF) Using an electronically programmable voltage reference (DS4305) as a single-bit nonvolatile memory cell, this circuit remembers the state of a STANDBY/ON switch that changes state with no operator present.

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App note: Single-pushbutton ON/OFF power control

Sunday, May 7th, 2017

With the help of an MAX6816 debouncer from Maxim Integrated to form a single push button power switch. Link here (PDF) This application note presents a single-pushbutton power-control circuit. The design consists of an ON/OFF control circuit comprised of a push button, debouncer, and flip-flop. This circuit toggles the power...

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App note: Automotive reverse battery protection diode

Sunday, April 30th, 2017

Super Barrier Rectifier™ (SBR) from Diodes Incorporated offers good power efficiency compared to normal PN junction diode and design simplicity compared to MOSFETs reverse protection. Link here (PDF) This application note compares the performance of Diodes Inc. Super Barrier Rectifier™ (SBR) as an automotive reverse battery protection diode with other...

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App note: A closer look at LVDS technology

Sunday, April 30th, 2017

A general overview of Low Voltage Differential Signaling (LVDS) from Diodes incorporated. Link here (PDF) With the increase in demand for high throughputs, current technologies are becoming less efficient. Data transmission devices like RS-422, RS-485, SCSI and other devices are limited in data rate and power dissipation. With LVDS, data...

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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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