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參數(shù)資料
| 型號： | TC647VOART |
| 元件分類： | 運動控制電子 |
| 英文描述： | BRUSHLESS DC MOTOR CONTROLLER, PDSO8 |
| 封裝： | SOIC-8 |
| 文件頁數(shù)： | 11/15頁 |
| 文件大?。?/td> | 117K |
| 代理商： | TC647VOART |
5
TC647-2
12/05/00
TC647
PWM Fan Speed Controller with FanSense*
2001 Microchip Technology Inc.
DS21447A
SYSTEM BEHAVIOR
The flowcharts describing the TC647’s behavioral algo-
rithm are shown in Figure 3. They can be summarized as
follows:
Power-Up
(1) Assuming the device is not being held in Shutdown
Mode (VMIN > VREL)…
(2) Turn VOUT 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
After this period elapses, the TC647 begins normal
operation.
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. VOUT duty-cycle goes to zero.
b. FAULT is disabled.
c. Exit the loop and wait for VMIN > VREL to
resume operation (indistinguishable from
Power-Up).
(3) Drive VOUT to a duty-cycle porportional to greater
of VIN and VMIN 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…
FAULT
SENSE
NTC
R1
R2
R3
R4
GND
FAN FAULT
SHUTDOWN
(OPTIONAL)
Note: *See Cautions Regarding Latch-up Considerations in the Applications Section.
Q1
+12V
+5V*
VDD
VIN
VMIN
VOUT
RBASE
RSENSE
CSENSE
CF
1
F
CF
TC647
FAN
1
F
CB
0.01
CB
0.01
CB
1
8
6
7
5
4
2
3
Figure 2. Typical Application Circuit
(7) Activate the 32-cycle Startup 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
Fan Fault
Fan Fault is essentially an infinite loop wherein the
TC647 is latched in Shutdown Mode. This mode can only be
released by a Reset, i.e., VMIN being brought below VSDHN,
then above VREL, or by power-cycling.
(1) While in this state, FAULT is latched on (low), and
the VOUT output is disabled.
(2) A Reset sequence applied to the VMIN pin will exit the
loop to Power Up.
(3) End
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| TC647VOATR | 功能描述:馬達(dá)/運動/點火控制器和驅(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 |
| TC647VPA | 功能描述:馬達(dá)/運動/點火控制器和驅(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 |
| TC647VUA | 功能描述:馬達(dá)/運動/點火控制器和驅(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 |
| TC647VUATR | 功能描述:馬達(dá)/運動/點火控制器和驅(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 |
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