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參數(shù)資料
| 型號： | TC647VUA |
| 廠商： | Microchip Technology Inc. |
| 英文描述： | PWM Fan Speed Controller with FanSense Technology |
| 中文描述： | 與FanSense PWM風(fēng)扇速度控制器技術(shù) |
| 文件頁數(shù)： | 7/28頁 |
| 文件大?。?/td> | 478K |
| 代理商： | TC647VUA |
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2002 Microchip Technology Inc.
DS21447C-page 7
TC647
4.0
SYSTEM BEHAVIOR
The flowcharts describing the TC647’s behavioral
algorithm are shown in Figure 4-1. They can be
summarized as follows:
4.1
Power-Up
(1) Assuming the device is not being held in shutdown
mode (V
MIN
> V
REL
)…
(2) Turn V
OUT
output on for 32 cycles of the PWM
clock. This ensures that the fan will start from a
dead stop.
(3) During this Start-up Timer, if a fan pulse is
detected, branch to Normal Operation; if none are
received…
(4) Activate the 32-cycle Start-up Timer one more time
and look for fan pulse; if a fan pulse is detected,
proceed to Normal Operation; if none are
received…
(5) Proceed to Fan Fault.
(6) End.
4.2
Normal Operation
Normal Operation is an endless loop which may only
be exited by entering shutdown mode or Fan Fault. The
loop can be thought of as executing at the frequency of
the oscillator and PWM.
(1) Reset the missing pulse detector.
(2) Is TC647 in shutdown If so…
a. V
OUT
duty cycle goes to zero.
b. FAULT is disabled.
c. Exit the loop and wait for V
MIN
> V
REL
to resume
operation (indistinguishable from Power-up).
(3) Drive V
OUT
to a duty cycle proportional to greater
of V
IN
and V
MIN
on a cycle by cycle basis.
(4) If a fan pulse is detected, branch back to the start
of the loop (1).
(5) If the missing pulse detector times out …
(6) Activate the 3-cycle Diagnostic Timer and look for
pulses; if a fan pulse is detected, branch back to
the start of the loop (1); if none are received…
(7) Activate the 32-cycle Start-up Timer and look for
pulses; if a fan pulse is detected, branch back to
the start of the loop (1); if none are received…
(8) Quit Normal Operation and go to Fan Fault.
(9) End.
4.3
Fan Fault
Fan Fault is an infinite loop wherein the TC647 is
latched in shutdown mode. This mode can only be
released by a reset (i.e., V
MIN
being brought below
V
SHDN
, then above V
REL
, or by power cycling).
(1) While in this state, FAULT is latched on (low) and
the
V
OUT
output is disabled.
(2) A reset sequence applied to the V
MIN
pin will exit
the loop to Power-up.
(3) End.
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| TC647 | PWM Fan Speed Controller with FanSense Technology |
| TC647EPA | PWM Fan Speed Controller with FanSense Technology |
| TC647EUA | PWM Fan Speed Controller with FanSense Technology |
| TC648VOA | Fan Speed Controller with Auto-Shutdown and Over-Temperature Alert |
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| TC647VUATR | 功能描述:馬達(dá)/運(yùn)動/點(diǎn)火控制器和驅(qū)動器 w/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(fēng)格:SMD/SMT 封裝 / 箱體:HTSSOP-28 封裝:Tube |
| TC648 | 制造商:MICROCHIP 制造商全稱:Microchip Technology 功能描述:Fan Speed Controller with Auto-Shutdown and Over-Temperature Alert |
| TC648_13 | 制造商:MICROCHIP 制造商全稱:Microchip Technology 功能描述:Fan Speed Controller with Auto-Shutdown and Over-Temperature Alert |
| TC648B | 制造商:MICROCHIP 制造商全稱:Microchip Technology 功能描述:PWM Fan Speed Controllers With Auto-Shutdown, Fan Restart and FanSense⑩ Technology for Fault Detection |
| TC648BEOA | 功能描述:馬達(dá)/運(yùn)動/點(diǎn)火控制器和驅(qū)動器 Shtdn & Over-T Alert 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(fēng)格:SMD/SMT 封裝 / 箱體:HTSSOP-28 封裝:Tube |
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