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| TC646BEPA Datasheet, PDF (17/36 Pages) Microchip Technology – PWM Fan Speed Controllers With Auto-Shutdown | |||
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TC646B/TC648B/TC649B
Power-Up
Power-on
Reset
OTF = 1
VAS = 0V
Yes
Minimum
Speed Mode
No
VIN < VAS?
No
Yes Auto-
Shutdown
VOUT = 0
VIN >
No
(VAS+ VHAS)
Yes
Fire Start-up
Timer
(1 sec)
Normal
Operation
Minimum
Speed Mode
Yes
VOUT = 0
No
VIN > 1.20V
Power-Up
Yes
VIN = 0V
No
No
VIN > 1.20V
VOUT = 0
Yes
VOUT
Proportional
to VIN
Yes
VIN > VOTF?
No
OTF = 0
OTF = 1
Normal
Operation
VOUT
Proportional
to VIN
Yes
VIN > VOTF?
No
OTF = 0
OTF = 1
Auto
Yes
Shutdown
VIN < VAS?
VOUT = 0
No
FIGURE 4-10:
TC648B Behavioral Algorithm.
 2003 Microchip Technology Inc.
DS21755B-page 17
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