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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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App note: Using touch interface in harsh environments

Sunday, February 12th, 2017

Tough design and software reference from NXP of touch interface. Link here (PDF) The touch-sensing method is used to replace most of traditional tact switch inputs as a new type of human-machine interface used in home-appliance applications. However, using such kind of detection method in harsh environment is still a...

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App note: Water level monitoring

Sunday, February 12th, 2017

A reference design from NXP about water level detection using pressure sensor. Link here (PDF) Many washing machines currently in production use a mechanical sensor for water level detection. Mechanical sensors work with discrete trip points enabling water level detection only at those points. The purpose for this reference design...

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App note: Choose the right voltage regulator to extend battery life in wearables

Sunday, February 5th, 2017

App note from Maxim Integrated on wearable devices demanding reduced quiescent and shut down currents when in idle and in sleep mode in a voltage regulator. Link here Wearable devices have emerged as the next big market opportunity in the electronics industry. Smart watches are among the most popular wearable...

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App note: Voltage reference long-term stability reduces industrial process control calibration costs

Sunday, February 5th, 2017

Application note from Maxim Integrated about improved long term stability of their voltage references. Link here (PDF) Large industrial plants such as those in the oil, gas, electricity, pharmaceutical, and food and beverage industries rely on electronic instrumentation to provide accurate, stable measurements to control their processes. The stability of...

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App note: Designing reliable drones using proper circuit protection

Sunday, January 29th, 2017

Littelfuse's application note on drone circuitry protection, offering guard against overcharging its batteries, I/O and ESD protection. Link here (PDF) No doubt “pilot losing control” is behind many drone incidents and crashes. But what’s behind that “loss of control?” After all, even small recreational drones depend on a host of...

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App note: Magnetic sensors’ and reed switches’ capacitive Loads

Sunday, January 29th, 2017

An application note from Littelfuse on peak current considerations when reed switches and magnetic sensors are handling capacitive loads. Link here (PDF) When there is significant capacitance in a reed sensor, reed relay or reed switch circuit, the peak current and energy switched by the reed contacts should be considered....

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App note: Simple Switcher PCB layout guidelines

Sunday, January 29th, 2017

Simple Switcher PCB layout guidelines from Texas Instruments, app note here (PDF!) One problem with writing an application report on PCB layout is that the people who read it are usually not the ones who are going to use it. Even if the designer has struggled through electromagnetic fields, EMC,...

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App note: Testing inductors at application frequencies

Sunday, January 22nd, 2017

An app note from Coilcraft on inductance and Q parameters which are the important factors of an inductor and how these values are found. Link here (PDF) The accurate measurement of an inductor has always been more difficult than the measurement of other passive components. The primary difficulty with coil...

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