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Next generation switch-mode power supplies

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article image Ideal for ac/dc converters.

MICROCHIP Technology , a leading provider of microcontrollers and analogue semiconductors, 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 pulse-width-modulator (PWM) and two million samples per second (MSPS), 10-bit analogue-to-digital (A/D) converter 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 uninterruptible power supplies (UPS).

Microchip is a leading supplier of microcontrollers and analog control products to the power conversion industry. The company'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 dsPIC30F1010 and dsPIC202X DSCs free designers to implement this type of complete digital control in their products.

The new DSCs enable full control of the power-conversion process via software running on the DSC and through its high performance integrated peripherals.

Examples of applications that can immediately see cost and performance benefits from the dsPIC DSC SMPS solution include power supplies with multiple outputs, coordinated load sharing, hot-swap capability, output coordination, integrated power factor correction or extensive fault-handling.

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 10-bit A/D converter has up to 12 input channels and samples at up to 2MSPS. Advanced sampling capabilities include individual triggers for each of four sample and holds, and precise, uniquely timed or simultaneous sampling.

The dsPIC30F1010 devices have 6kB of Flash and two PWM generators, and the dsPIC30F202X devices have 12kB of Flash and four PWM generators. All devices in this family operate between 3.0 and 5.5 volts.

Additional features include:

* Onboard high-speed analog comparators (2 or 4)

* 30 MIPS performance at 5.0 volts

* Small footprint QFN package (6 mm x 6 mm)

* Fast, deterministic response

* Extended temperature operation (-40° to 125°C).

* Optional PWM dither mode for electromagnetic interference (EMI) reduction.

Development support

The dsPIC30F1010 and dsPIC30F202X DSCs are supported by the MPLAB integrated development environment (IDE), MPLAB C30 C compiler, MPLAB SIM 30 software simulator, MPLAB ICD 2 in-circuit debugger and MPLAB visual device initialiser.

Additionally, Microchip expects to offer the dsPICDEM SMPS buck development board (Part # DM300023) which was designed to support development using the dsPIC30F1010 and dsPIC202X devices.

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