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TC649EPA Datasheet(PDF) 8 Page - Microchip Technology |
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TC649EPA Datasheet(HTML) 8 Page - Microchip Technology |
8 / 28 page TC649 DS21449C-page 8 2002 Microchip Technology Inc. FIGURE 4-1: TC649 Behavioral Algorithm Flowchart. FAULT = 0, VOUT = 0 Auto-Shutdown FAULT = 1, VOUT = 0 Cycling Power VIN < VSHDN? Yes Yes Yes No No No No Yes Power-Up VIN > (VAS + VHAS)? VIN > VREL? 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 YES 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 Fan Fault Clear Missing Pulse Detector VOUT Proportional to VIN VIN < VSHDN? VIN < VAS? 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 Fire Diagnostic Timer (100msec) Fan Pulse Detected? Fan Pulse Detected? Fire Start-up Timer (1 Sec) Yes No |
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