Thermal performance: Resistor offers three ways to dissipate heat
-- Control Engineering, 11/21/2006
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| BHP75 Series power resistor from TT electronics' BI Technologies SMT Div. features an insulated tapered venturi bonded to the substrate for maximum heat dissipation |
Design is said to provide three methods of heat dissipation. Explains Jim Rieley, sales director, "The chimney-shaped tapered venturi is attached to the ceramic substrate and convection forces hot air up the neck of the chimney and away from the resistor face of the component." The resistor uses all three methods for dissipating heat, he adds, including conduction through the heat sink tab, radiation from the resistor surface, and convection through the venturi element.
Applications include higher wattage switchmode power supply circuits, motor control and drive circuits, inverters, and industrial power equipment. Products are rated for 75 W power dissipation at tab temperature maintained at 25 °C or less than 75 W. Resistance ranges from 1O to 100KO with tolerances of ±1% and ±5%. TCR (temperature coefficient of resistance) ranges less than 100 ppm/°C with maximum dc operating voltage of 250 V and dielectric-withstanding voltage of 1 kV. Thermal resistance is 1.3 °C/W from the resistor's hot spot to the package's metal flange. Operating temperature range is -55 to 155 °C.
Click here for more information or to obtain an engineering evaluation sample.
—Control Engineering Daily News Desk
Jeanine Katzel, senior editor
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