TC648B Microchip Technology Inc., TC648B Datasheet - Page 17

• Manufacturer Part Number: TC648B
• Description: Pwm Fan Speed Controllers With Auto-shutdown, Fan Restart And Fansense Technology For Fault Detection
• Manufacturer: Microchip Technology Inc.

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