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AH280A-SPLA Datasheet(PDF) 4 Page - Anachip Corp |
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AH280A-SPLA Datasheet(HTML) 4 Page - Anachip Corp |
4 / 7 page AH280 Hall-Effect Smart Fan Driver Anachip Corp. www.anachip.com.tw Rev. 0.7 Apr 16, 2004 4/7 Rotation detection The automatic restart circuit detects a motor lock condition and automatically turns off the output current. When the lock condition is cleared, the IC automatically restarts and allows the motor to run. In the AH280, automatic restart is performed in the following manner. A motor lock condition is detected when the Hall signal stops switching. The output is ON when CT pin is being charged, and OFF when CT pin is being discharged. OFF ON CT clamp voltage CT comparator voltage T off* T on* CT Motor locked Motor locked detected Motor output Hall input Motor locked cleared Reverts to normal operation Output ON time (Ton) and OFF time (Toff) Determined by the CT pin capacitor Where Ton= CHG I ) CP V CL (V C − × (sec) Toff= DHG I ) CP V CL (V C − × (sec) C is the capacitance of the CT pin external capacitor VCL is the CT pin clamp voltage VCP is the CT pin comparator voltage ICHG is the CT pin charge current IDHG is the CT pin discharge current |
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