Anti-electromagnetic Interference PWM Fan Controller Circuit

Published:2011/8/4 2:39:00 Author:May | Keyword: Anti-electromagnetic Interference, PWM Fan Controller | From:SeekIC

Microchip Tech-nology ( Microchip) company provides a type of fan refrigeration speed control system series product working on PWM mode, they are used for DC brushless cooling fans ( literature cite one) . We can use outside NTC(negative temperature coefficient) thermistor or a kind of PIC microcontroller from Microchip Tech-nology and SMBus serial data bus to utilize PWM waveform's dutyfactor to control fan speed.Figure 1 shows one kind of typical application ( literature cite two) description of TC664 and TC665 controller data information. It uses 1mF frequency control capacitor CF and fan controller IC1 to generatre a PWM pulse series, its nominal frequency is 30Hz,and thedutyfactor change range rely on temperatureis 30%-100%.



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