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TC646B Datasheet(PDF) 16 Page - Microchip Technology |
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TC646B Datasheet(HTML) 16 Page - Microchip Technology |
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16 / 36 page  TC646B/TC648B/TC649B DS21755B-page 16 2003 Microchip Technology Inc. FIGURE 4-9: TC646B/TC649B Behavioral Algorithm. Fire Start-up Timer (1 sec) Fan Pulse Detected? Fan Pulse Detected? VIN < VSHDN? VIN < VAS? Shutdown VOUT = 0 Auto- Shutdown VOUT = 0 Yes No No No No Yes Yes Yes Power-Up Normal Operation Fan Fault Power-on Reset FAULT = 1 VIN > VREL? No VIN> (VAS+ VHAS) Yes Yes No Hot Start Fire Start-up Timer (1 sec) Fire Start-up Timer (1 sec) VIN > VREL? Yes Fan Fault Clear Missing Pulse Detector VOUT Proportional to VIN VIN < VSHDN? VIN < VAS? VIN > VOTF? M.P.D. Expired? Fan Pulse Detected? Shutdown VOUT = 0 Auto Shutdown VOUT = 0 No No No No No No Yes Yes Yes Yes Normal Operation Power-Up VIN > (VAS + VHAS) No Yes Hot Start Yes No FAULT = 0 Yes Fire Diagnostic Timer (100 msec) Fan Pulse Detected? Fan Pulse Detected? Yes No FAULT = Low, VOUT = High 16 Pulses Detected? No Yes Power-Up VIN< VSHDN? VIN > VREL? Fan Fault Yes Normal Operation Shutdown VOUT = 0 Yes No No TC646B Only |
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