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MIC502 Datasheet(PDF) 5 Page - Micrel Semiconductor |
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MIC502 Datasheet(HTML) 5 Page - Micrel Semiconductor |
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5 / 15 page  Micrel, Inc. MIC502 November 2006 5 M9999-112206 VOH VOL 40% 60% 30% 0% 100% tSTARTUP tPWM Output Duty Cycle HI JK M N L 0.7VDD 0.3VDD 0.3VDD VT1 VT2 VSLP 100% 0% 20% 60% 40% 30% PWM Range VOT VIH VIL 0V VOH VOL VOUT VOTF O 100% VDD 0V VDD 0V 0V Figure 2. MIC502 Typical Power-Up System Behavior Note H. At power-on, the startup timer forces OUT on for 64 PWM cycles of the internal timebase (tPWM). This insures that the fan will start from a dead stop. Note I. The PWM duty-cycle follows the higher of VT1 and VT2, in the case, VT1. Note J. The PWM duty-cycle follows VT1 as it increases. Note K. PWM duty-cycle is 100% (OUT constantly on) anytime VT1 > VPWM(max). Note L. /OTF is asserted anytime VT1 > VOT. (The fan continues to run at 100% duty-cycle). Note M. /OTF is deasserted when VT1 falls below VOT; duty-cycle once again follows VT1. Note N. Duty-cycle follows VT1 until VT1 < VT2, at which time VT2 becomes the controlling input signal. Note that VT1 is below VSLP but above VIH; so normal operation continues. (Both VT1 and VT2 must be below VSLP to active sleep mode). Note O. All functions cease when VT1 < VIL; this occurs regardless of the state of VT2. |
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