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US891 Datasheet(PDF) 6 Page - Melexis Microelectronic Systems |
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US891 Datasheet(HTML) 6 Page - Melexis Microelectronic Systems |
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6 / 12 page  3901000890 Rev 003 According to the electrical specification • VDD < 5.5V, TON/TOFF time peri The periods increase with ope • VDD > 7V, TON/TOFF time periods The periods at high voltage ar • 5.5V < VDD < 7V, the switching A small hysteresis is implemen The typical mean threshold bet This facilitates driving heavier fans and increased or decreased depending on the The FG/RD output driver provides an while switched ON. It can occur if a too This protection reduces the risk of EO US890 / Two-Coil Fan Driver – High Ou Page 6 of 12 on table and the figure above, three behaviours can o iods are longer (from 0.53s / 3.2s typical at 5.5V) perating voltage to improve start-up at very low voltage ods are shorter (0.25s / 1.5s typical) re about twice as short as at low voltage ng event may slightly vary, but is kept within these lim mented to avoid oscillation around the threshold voltage. between the hysteresis is around 6.1V (TA=25°C). and motors with large inertia without any external compon on the fan supply voltage VDD). over current protection limiting the current flowing in too small pull-up resistor is used or if this resistor is sho OS damage on the FG/RD driver. 0 / US891 utput Current Data Sheet Apr/12 occur: e. mits. e. ponent (TON/TOFF is the FG/RD driver hort connected. |
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