Saturday, May 07, 2016

Nordic Semiconductor - Wireless Microchip

A semiconductor company specializing in design solutions at the microchip level in the areas of wireless communication and multimedia. Nordic Semiconductor ASA is a world leader in high-speed data converters and short-range radio communication.

Nordic Semiconductor - Wireless Microchip

ANT is a proven, ultra low power, flexible and easy-to-use network protocol for 2.4GHz ISM band communication. ANT provides multivendor interoperability via the ANT+ managed network and the member companies of the open ANT+ Alliance.

Useful for ultra low power wireless sensor network applications including wireless sensors and hubs.

ANT - Single chip ICs/solutions

ANT is perfectly suited for any kind of low data rate sensor network topologies in personal area networks (PANs) and practical wireless sensor networks

Nordic nRF51 SoC Eval Kit

"Nordic Semiconductor has released a matchbox-sized, low cost, battery-powered eval kit for its latest nRF51 Series of SoCs that allows engineers to perform real-world environmental testing of ANT+, Bluetooth low energy (including Bluetooth Smart), and proprietary 2.4GHz ultra low power wireless sensors and accessories 'in the field'"

Nordic Semiconductor ASA
Otto Nielsens veg 12 Trondheim, 7052 Norway

Friday, May 06, 2016

LM2575 - Buck Adjustable Switching Regulator

"The buck-boost regulator circuit delivers -5V output. I hoped this would a nice way to generate a negative voltage for e.g. an LCD-display. However this circuit requires component values that are similar to the buck regulator at high load."

Experiments with the LM2575

Here is a nice way of using this regulator, this can be used for CMOS opamps as you have a -5V too. That means a portable instrument may find this design useful.

The TI Datasheet Layout Guidelines

LM2575 Switching Regulator
LM2575 - Step-Down Adjustable Voltage Switching Regulator with Output Enable

The LM2575 represents a superior alternative to  popular three-terminal linear regulators. Due to its
high efficiency, it significantly reduces the size of the heat sink.

The device also offers internal frequency compensation, a fixed-frequency oscillator, cycle-by-cycle current limiting, and thermal shutdown.

Sunday, May 01, 2016

LED Drive using TPS61042 from TI

This Chip from TI is simple to integrate into your designs and this solution is good for production of lighting gadgets, here a consistent quality and predictable performance is easily obtained.

TPS61042 30-V, 500-mA Switch Boost Converter in QFN-8 for White LED Applications

LED-driver application that drives four LEDs with 20 mA of forward current and operates from an input voltage range of 1.8 to 6.0 V.

LED Drive using TPS61042 from TI

The entire circuit consists of the control IC, two small ceramic caps, an inductor, a diode, and a current sense resistor. The primary power-supply functions and the secondary features such as load disconnect, overvoltage protection, and PWM dimming have been implemented with a control IC and five small surface-mount passive components.

LED-driver considerations By Michael Day