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Digital signal controllers target power supply apps

Posted: 14 May 2015 ?? ?Print Version ?Bookmark and Share

Keywords:Microchip Technology? power supply? DSC? algorithm?

Microchip Technology Inc. has rolled out a 14-member dsPIC33EP "GS" family of digital signal controllers (DSCs) that promises to provide the performance needed to implement more sophisticated non-linear, predictive and adaptive control algorithms at higher switching frequencies. According to the company, the advanced algorithms enable power supply designs that are more energy efficient and have better power supply specifications.

Higher switching frequencies enable the development of physically smaller power supplies that offer higher densities and lower costs. Compared with the previous generation of DSCs, the dsPIC33EP "GS" devices provide less than half the latency, when used in a three-pole three-zero compensator, and consume up to 80 per cent less power in any application, indicated the company.


This dsPIC33EP "GS" family includes advanced features such as Live Update Flash capability, which is especially helpful for high-availability or "always-on" systems. Live Update can be used to change the firmware of an operating power supply, including the active compensator calculation code, while maintaining continuous regulation. Variants from this digital-power-optimised DSC family are available 4mm x 4mm UQFN package for space-constrained designs.

Other key features of this family include up to five 12bit ADCs with as many as 22 ADC inputs, providing total throughput of 16Msps with a 300ns ADC latency. The dsPIC33EP "GS" devices include 12bit DACs for each of the four analogue comparators, for higher-precision designs. The two on-chip programmable gain amplifiers can be used for current sensing and other precision measurements. Including these advanced analogue amplifiers on the device reduces the number of external components required, thereby saving cost and board space. These features, combined with the overall high performance of the dsPIC33EP "GS" family, make it well suited for a range of applications including the following examples: computer & telecom (e.g., AC/DC and DC/DC power supplies), industrial (e.g., solar inverters, LED lighting, HID lighting, battery chargers, projectors and welders) and automotive (e.g., LED and HID headlights, DC/DC converters), among others.

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