Streamline switched-reluctance design with new Smart Power Modules

For a competitive edge in domestic-appliance design, the latest Smart Power Modules (SPM®) from Fairchild Semiconductor® are the first modules to solve the entire power-circuit requirements for Switched- Reluctance Motors (SRM).

Fairchild’s FCAS50SN60 SRM SPM integrates the high-voltage IC (HVIC), low-voltage IC (LVIC), high-side and low-side IGBTs, and fast recovery diodes to simplify integration, save up to 40% of board space, increase reliability and reduce manufacturing costs. With drive levels prematched to the low-loss IGBTs, as well as optimised circuit protection features, the FCAS50SN60 eliminates key design challenges associated with discrete SRM drivers. Voltage and current ratings of 600V and 50A assure high power-handling capability, as well as rugged and durable performance.

The integrated HVIC provides several advantages for designers, including eliminating the need for optocouplers in the IGBT gate circuits to minimise the footprint of the FCAS50SN60. It also allows a single-supply drive topology for the device, eliminating the requirement for negative bias.

Integrated protection features of the FCAS50SN60 further enhance system reliability, including under-voltage lock-out and shortcircuit protection. The module also contains a thermistor to enable over-temperature shutdown without requiring any external components.

As a smart module for motors rated up to 2kW, the FCAS50SN60 also benefits from thermally-efficient package construction including Direct-Bonded Copper (DBC) technology to minimise the thermal resistance to ambient levels. This delivers benefits including lower die temperature for higher reliability, as well as easier thermal management to save design complexity and reduce materials costs. DBC construction also helps to ensure a very low leakage current for high operating efficiency.

The FCAS50SN60 is available in a Mini-DIP package measuring 44mm x 26.8mm that satisfies basic creepage- and clearancespacing requirements.

 

FEATURES Switching frequency range: 2.2kHz to 8kHz 2500Vrms minimum isolation rating Active-high input signal logic Support for independent phase-current monitoring

APPLICATIONS Domestic vacuum cleaners Washing machines Industrial controls Machine tools

 

 

Fairchild Semiconductor / FCAS50SN60 SRM-SPM