Zetex plc (Chadderton, Oldham) presented its ZXBM1004 pre-driver IC for flexible, variable speed control of single-phase, brushless dc fans and blowers. Compared to fixed-speed alternatives, this integrated solution offers reductions in component count, audible noise and power consumption. Fully compatible with NTC thermistor, voltage and PWM input signals, the QSOP16-packaged ZXBM1004 provides thermal control of single-phase motors up to 100 W in PCs, mainframes and other applications dependent on forced-air cooling.
The ZXBM1004’s adjustable, minimum-speed setting prevents the fan from running too slowly or not being able to start. An external resistor protects the speed control circuit against supply voltage fluctuations, ensuring air flow is maintained at the target level. A built-in automatic restart function is set using a single capacitor.
Pricing for the ZXBM1004 is $0.88 in quantities of 1,000.
