Power_electronics Features

Evaluating Three Key Pieces of a SiC Total System Solution - October 2020
Following a rapid expansion of SiC product options, the industry’s next challenge is simplifying the design-in process for end users. Power system developers need holistic solutions that address not...
More details...
Linear voltage regulators operate at automotive temperatures
Designed for high reliability, high temperature applications, the CMT-Antares is Cissoid's latest regulator.
More details...
Power Electronics Europe News
DAC has integrated buck/boost converter and simplifies power design

Claimed to combine industry-leading precision performance with simpler power-supply design, the DAC8775 operates from a single, wide 12 to 36V power rail. It leverages and an integrated buck/boost converter to generate all of the required internal power supplies, saving time, cost and board space, says the company.


The four-channel DAC addresses the trend to include more channels in a smaller space in factory automation and process control equipment. A major challenge to this is managing power dissipation in a small form factor. By combining a 4.0 to 20mA current and voltage driver with a precision reference and a buck/boost converter, the DAC8775 reduces total system footprint by up to 215 per cent, claims the company, compared with the nearest competing device.


An on-chip diagnostic features include smart alarms that monitor open load, short circuit, over-temperature, cyclic redundancy check (CRC), watchdog timer and compliance voltage. Designers can choose pre-set actions that help detect faults early to facilitate reliable system operation.


An auto-learn feature calculates the load impedance on the current loop and clamps the power supply for faster settling time, balancing efficiency with quicker system response.


A total unadjusted error of 0.1% full-scale range (FSR) over an extended industrial temperature range of -40 to 125°C enables designers to rate output modules for higher temperature ranges. According to the company, the high DC performance reduces the need for system calibration, saving manufacturing costs compared to a discrete solution.

For a thermally optimised design, the DAC8775 dynamically adjusts the generated supply based on the current load on the current loop. This creates an efficient system with well-controlled thermal performance, allowing more channels in a smaller space, says the company.

A four-channel analog output module reference design demonstrates the combination of the DAC8775 and the LM5166 high-efficiency synchronous buck converter, also from Texas Instruments, that dissipates less than 1.0W of power in factory-automation implementations.


The DAC8775 is available now in a 10 x 10mm QFN package.


View PDF
Go Back   
Newsletter sign up