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DSCs feature ultra-fast PWM, onboard ADC

Posted: 25 Jul 2006     Print Version  Bookmark and Share

Keywords:Microchip  dsPIC30F1010  dsPIC30F2020/2023  digital signal controller  DSC 

Microchip Technology Inc. has announced a family of 16-bit dsPIC Digital Signal Controllers (DSCs) for common, multi-loop switch-mode power supplies (SMPSs) and other power-conversion applications. The dsPIC30F1010 and dsPIC30F2020/2023 (dsPIC30F202X) DSCs have a high-speed, 1ns resolution PWM and 2MSps, 10bit ADC onboard for low latency and high-resolution control. The devices are ideal for AC/DC converters, isolated DC/DC power-converters and other power-conversion applications, such as embedded power-supply controllers, power inverters and UPSs.

Microchip's microcontrollers have long been used in intelligent power supplies for communications, power-sequencing, soft-start and topology control. However, until now, lack of effective solutions has hampered the development of supplies using digital control of the complete power-conversion loop. The company said its new DSCs free designers to implement this type of complete digital control in their products.

"Power-supplies with higher power or complexity are now poised at a price threshold that is amenable to digital control," said Sumit Mitra, VP of Microchip's Digital Signal Controller Division. "Our dsPIC SMPS families were developed with input from leading power-supply manufacturers to tip the scale in favour of a digital approach. These devices accelerate innovation by giving early adopters flexibility to create new topologies that were formerly impractical for analogue approaches. Early adopters expect to achieve superior levels of customisation, resulting in power supplies that are more competitive in their markets."

The new DSCs promise full control of the power-conversion process via software running on the DSC and through its high-performance integrated peripherals. According to Microchip, designers are no longer limited by analogue-control design techniques. Components no longer need to be "oversized" to account for component variation. There is no need to worry about component drift and temperature compensation. Manual tuning at the end of the manufacturing line will be a thing of the past. Fewer product platforms are required to serve a wider range of applications, as they are differentiated through software rather than hardware. Additionally, new digital topologies will provide designers with a higher degree of freedom to develop supplies with improved power density and improved cost effectiveness, the company said.

The PWM onboard the dsPIC30F1010 and dsPIC30F202X devices offers 1ns duty cycle resolution and seven modes of operation, including standard, complementary, push-pull and variable-phase. The 10bit ADC has up to 12 input channels and samples at up to 2MSps.

The dsPIC30F1010 devices have 6Kbytes of Flash and two PWM generators, and the dsPIC30F202X have 12Kbytes of Flash and four PWM generators. All devices in this family operate at between 3V and 5.5V.

The dsPIC30F1010 is available in 28-pin SOIC, SPDIP and QFN packages, the dsPIC30F2020 in 28-pin SOIC, SPDIP and QFN packages and the dsPIC30F2023 in 44-pin TQFP and QFN packages. General sampling has begun this month and volume production is expected in August.

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