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TC646BEOATR Datasheet(PDF) 17 Page - Microchip Technology

Part # TC646BEOATR
Description  PWM Fan Speed Controllers With Auto-Shutdown, Fan Restart and FanSense??Technology for Fault Detection
PDF  36 Pages
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Manufacturer  MICROCHIP [Microchip Technology]
Direct Link  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

TC646BEOATR Datasheet(HTML) 17 Page - Microchip Technology

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 2003 Microchip Technology Inc.
DS21755B-page 17
TC646B/TC648B/TC649B
FIGURE 4-10:
TC648B Behavioral Algorithm.
VAS = 0V
VIN < VAS?
Auto-
Shutdown
VOUT = 0
Yes
No
No
Yes
Power-Up
Power-on
Reset
OTF = 1
VIN >
(VAS+ VHAS)
Yes
No
Fire Start-up
Timer
(1 sec)
VIN > 1.20V
VOUT
Proportional
to VIN
VIN > VOTF?
Auto
Shutdown
VOUT = 0
No
No
Yes
Normal
Operation
VOUT = 0
No
Yes
Yes
Minimum
Speed Mode
Normal
Operation
OTF = 1
OTF = 0
VIN < VAS?
Minimum
Speed Mode
VIN = 0V
Power-Up
VIN > 1.20V
VOUT
Proportional
to VIN
VIN > VOTF?
No
Yes
OTF = 1
OTF = 0
VOUT = 0
Yes
No
No
Yes



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