Infineon Technologies announced further members of its CoolSET F2 family at the recent PCIM 2002 show. The new products in TO220 package are designed for output power ratings up to 240 W, enabling switched-mode power supply (SMPS) manufacturers to rapidly develop efficient, low-cost and high-quality power supplies conforming to the new EU minimum heat generation guidelines. The CoolSET F2 family boasts the lowest drain-source on-state resistance in the industry, around 40% less than that of current products on the market, according to the manufacturer.
Typical applications include primarily adapter power supplies, as well as integrated power supply solutions featuring high power density eg for flat-panel LCD monitors, set-top boxes or compact, general-purpose auxiliary power supply units.
The CoolSET F2 products combine a power MOSFET implemented in the company's CoolMOS (metal oxide semiconductor) technology with a fixed-frequency PWM (pulse width modulation) control IC. The very low switching and conduction losses lead to a marked reduction in heat generation. The new 240 W products in insulated TO220 package provide optimum heat dissipation, with thermal resistance (Rth = 2,5 K/W) improved by more than 50% compared with Fullpack versions. Heatsinking has been reduced to an absolute minimum.
Both TO220 versions, the CoolSET ICE2A765P and the ICE2B765P, integrate a CoolMOS with a drain-source on-state resistance (RDSon) of only 0,5[ohm] and a drain-source breakdown voltage (Vds) of 650 V. Conventional industry-standard TO220 power ICs exhibit on-state resistances of around 0,8[ohm] and above. If necessary, Infineon can integrate a CoolMOS with an RDSon of max. 0,35[ohm] and Vds of 650 V in a TO220 CoolSET.
Monitoring, protection and energy-saving
The new CoolSET F2 versions feature an array of built-in monitoring, protection and energy-saving functions. They minimise the amount of external wiring needed and allow a more compact SMPS design at a lower overall cost. Highlights include the current mode control function with integrated overshoot minimisation, MOSFET temperature sensing for instantaneous shutdown, as well as an under voltage lockout (UVL) function to prevent destruction of the CoolMOS as a result of incorrect drive voltage levels.
A user-defined softstart function increases the life of vital SMPS components; an extended pulse duty factor of the CoolMOS drive signal permits operation in either discontinuous or continuous current mode. The CoolSET's leading-edge blanking function ensures safe turn-on behaviour, both in standard situations and at auto restart.
Overcurrent, overvoltage and open-loop protection functions are also integrated. Under no-load, ie at 0 W output power, the standby power is stepped back to less than 500 mW (in 80 W applications). This energy-saving concept has been implemented without an additional connection pin, and with no external wiring.
Infineon has available a CoolSET F2 evaluation package, which includes samples, application notes, data sheet, demo board and demo board description, Excel-based PC calculation software, and PSpice models.
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