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參數(shù)資料
| 型號： | TC649EPA |
| 廠商： | Microchip Technology Inc. |
| 英文描述： | PWM Fan Speed Controller with Auto-Shutdown and FanSense⑩ Technology |
| 中文描述： | PWM風扇帶自動調(diào)速器關(guān)斷和FanSense⑩技術(shù) |
| 文件頁數(shù)： | 6/28頁 |
| 文件大?。?/td> | 478K |
| 代理商： | TC649EPA |
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TC649
DS21449C-page 6
2002 Microchip Technology Inc.
FIGURE 3-1:
TC649 Nominal Operation.
3.7
Shutdown Mode (RESET)
If an unconditional shutdown and/or device reset is
desired, the TC649 may be placed in shutdown mode
by forcing V
IN
to a logic low (i.e., V
IN
< V
SHDN
) (see
Figure 3-1). In this mode, all functions cease and the
FAULT output is unconditionally inactive. The TC649
should not be shut down unless all heat producing activ-
ity in the system is at a negligible level. The TC649 exits
shutdown mode when V
IN
becomes greater than V
REL
,
the release voltage.
Entering shutdown mode also performs a complete
device reset. Shutdown mode resets the TC649 into its
power-up state. The Start-up and Fault Timers and any
current faults are cleared. FAULT is unconditionally
inactive in shutdown mode. Upon exiting shutdown
mode (V
IN
> V
REL
), the Start-up Timer will be triggered
and normal operation will resume, assuming no fault
conditions exist and V
IN
> (V
AS
+ V
HAS
).
If a fan fault has occurred and the device has latched
itself into shutdown mode, performing a reset will not
clear the fault unless V
IN
> (V
AS
+ V
HAS
). If V
IN
is not
greater than V
AS
+ V
HAS
upon exiting shutdown mode,
the fan will not be restarted, and there will be no way to
establish that the fan fault has been cleared. To ensure
that a complete reset takes place, the user’s circuitry
must ensure that V
IN
> (V
AS
+ V
HAS
) when the device
is released from shutdown mode. A recommended
algorithm for management of the TC649 by a host
microcontroller or other external circuitry is given in
Section 5.0, “Typical Applications”. A small amount of
hysteresis, typically one percent of V
DD
(50mV at V
DD
= 5.0V), is designed into the V
SHDN
/V
REL
threshold.
The levels specified for V
SHDN
and V
REL
in Section 1.0,
“Electrical Characteristics”, include this hysteresis plus
adequate margin to account for normal variations in the
absolute value of the threshold and hysteresis.
2.6V
V
AS
+ V
HAS
V
IN
t
RESET
V
REL
V
SHDN
V
AS
1.2V
TC649
Status
Normal
Operation
Auto-Shutdown
Mode
Normal
Operation
Shut-
Down
Normal
Operation
GND
TIME
TEMP.
HI
LO
Note:
If V
IN
< V
AS
when the device exits shut-
down mode, the fan will not restart, but will
be in auto-shutdown mode.
CAUTION:
The fan will remain off as long as the V
IN
pin is being held low or V
IN
< V
AS
+ V
HAS
.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| TC649EUA | 功能描述:馬達/運動/點火控制器和驅(qū)動器 Shtdn & Fault Dtct RoHS:否 制造商:STMicroelectronics 產(chǎn)品:Stepper Motor Controllers / Drivers 類型:2 Phase Stepper Motor Driver 工作電源電壓:8 V to 45 V 電源電流:0.5 mA 工作溫度:- 25 C to + 125 C 安裝風格:SMD/SMT 封裝 / 箱體:HTSSOP-28 封裝:Tube |
| TC649EUATR | 功能描述:馬達/運動/點火控制器和驅(qū)動器 Shtdn & Fault Dtct RoHS:否 制造商:STMicroelectronics 產(chǎn)品:Stepper Motor Controllers / Drivers 類型:2 Phase Stepper Motor Driver 工作電源電壓:8 V to 45 V 電源電流:0.5 mA 工作溫度:- 25 C to + 125 C 安裝風格:SMD/SMT 封裝 / 箱體:HTSSOP-28 封裝:Tube |
| TC649VOA | 功能描述:馬達/運動/點火控制器和驅(qū)動器 Shtdn & Fault Dtct RoHS:否 制造商:STMicroelectronics 產(chǎn)品:Stepper Motor Controllers / Drivers 類型:2 Phase Stepper Motor Driver 工作電源電壓:8 V to 45 V 電源電流:0.5 mA 工作溫度:- 25 C to + 125 C 安裝風格:SMD/SMT 封裝 / 箱體:HTSSOP-28 封裝:Tube |
| TC649VOATR | 功能描述:馬達/運動/點火控制器和驅(qū)動器 Shtdn & Fault Dtct RoHS:否 制造商:STMicroelectronics 產(chǎn)品:Stepper Motor Controllers / Drivers 類型:2 Phase Stepper Motor Driver 工作電源電壓:8 V to 45 V 電源電流:0.5 mA 工作溫度:- 25 C to + 125 C 安裝風格:SMD/SMT 封裝 / 箱體:HTSSOP-28 封裝:Tube |
| TC649VPA | 功能描述:馬達/運動/點火控制器和驅(qū)動器 Shtdn & Fault Dtct RoHS:否 制造商:STMicroelectronics 產(chǎn)品:Stepper Motor Controllers / Drivers 類型:2 Phase Stepper Motor Driver 工作電源電壓:8 V to 45 V 電源電流:0.5 mA 工作溫度:- 25 C to + 125 C 安裝風格:SMD/SMT 封裝 / 箱體:HTSSOP-28 封裝:Tube |
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