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TC646B データシートの表示(PDF) - Microchip Technology
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TC646B
PWM Fan Speed Controllers With Auto-Shutdown, Fan Restart and FanSense™ Technology for Fault Detection
Microchip Technology
TC646B Datasheet PDF : 36 Pages
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TC646B/TC648B/TC649B
Power-Up
Power-on
Reset
OTF = 1
V
AS
= 0V
Yes
Minimum
Speed Mode
No
V
IN
< V
AS
?
No
Yes
Auto-
Shutdown
V
OUT
= 0
V
IN
>
No
(V
AS
+ V
HAS
)
Yes
Fire Start-up
Timer
(1 sec)
Normal
Operation
Minimum
Speed Mode
Yes
V
OUT
= 0
No
V
IN
> 1.20V
Power-Up
Yes
V
IN
= 0V
No
No
V
IN
> 1.20V
V
OUT
= 0
Yes
V
OUT
Proportional
to V
IN
Yes
V
IN
> V
OTF
?
No
OTF = 0
OTF = 1
Normal
Operation
V
OUT
Proportional
to V
IN
Yes
V
IN
> V
OTF
?
No
OTF = 0
OTF = 1
Auto
Yes
Shutdown
V
IN
< V
AS
?
V
OUT
= 0
No
FIGURE 4-10:
TC648B Behavioral Algorithm.
2003 Microchip Technology Inc.
DS21755B-page 17
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