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參數(shù)資料
| 型號： | TC647VOART |
| 元件分類： | 運(yùn)動控制電子 |
| 英文描述： | BRUSHLESS DC MOTOR CONTROLLER, PDSO8 |
| 封裝： | SOIC-8 |
| 文件頁數(shù)： | 10/15頁 |
| 文件大小： | 117K |
| 代理商： | TC647VOART |
4
TC647-2 12/05/00
TC647
PWM Fan Speed Controller with FanSense*
2001 Microchip Technology Inc.
DS21447A
missing pulse detector.
If consecutive pulses are not
detected for 32 PWM cycles (
≈1 Sec if CF = 1F), the
Diagnostic Timer is activated, and VOUT is driven continu-
ously for three PWM cycles (
≈100msec if CF = 1F). If a
pulse is not detected within this window, the Start-up Timer
is triggered (see above). This should clear a transient fault
condition. If the Missing Pulse Detector times out again, the
PWM is stopped, and FAULT goes low.
When FAULT is activated due to this condition, the
device is latched in Shutdown Mode and will remain off
indefinitely. Important: At this point, action
must be
taken to restart the fan by momentarily pulling VMIN
below VSHDN; or cycling system power. In either case,
the fan
cannot remain disabled due to a fault condition
as severe system damage could result. If the fan cannot
be restarted, the system should be shut down. The
TC647 may be configured to continuously attempt fan
restarts if so desired.
Continuous restart mode is enabled by connecting the
FAULT output to VMIN through a 0.1
F capacitor as shown
in Figure 1. When so connected, the TC647 automatically
attempts to restart the fan whenever a fault condition occurs.
When the fault output is driven low, the VMIN input is
momentarily pulled below VSHDN, initiating a reset and
clearing the fault condition, and normal fan startup is then
attempted as previously described. The FAULT output may
be connected to external logic (or the interrupt input of a
microcontroller) to shut the TC647 down if multiple fault
pulses are detected at approximately one second intervals.
Start-Up Timer
Whenever the fan is started from the off state, the Start-
up Timer turns the VOUT output on for 32 PWM cycles to
ensure reliable fan start-up.
This occurs at power-up and
when coming out of Shutdown Mode. If the PWM frequency
is 30Hz (CF = 1
F), the resulting start-up time will be about
one second. If a fault is detected (see below), the Diagnostic
Timer is triggered once, followed by the Start-up Timer. If the
fault persists, the device is shut down. See
FAULT Output
below.
Shutdown Control (Optional)
If VMIN, Pin 3, is pulled below VSHDN, the TC647 will go
into Shutdown Mode. This can be accomplished by driving
VMIN with an open drain logic signal or using an external
transistor as shown in Figure 1. All functions are suspended
until the voltage on VMIN becomes higher than VREL (0.85V
@ VDD = 5.0V). Pulling VMIN below VSHDN will always result
in complete device shutdown and reset. The FAULT output
is unconditionally inactive in Shutdown Mode.
A small amount of hysteresis, typically one percent of
VDD, (50mV at VDD = 5.0V) is designed into the VSHDN/VREL
threshold. The levels specified for VSHDN and VREL in the
Electrical Characteristics section include this hysteresis
plus adequate margin to account for normal variations in the
absolute value of the threshold and hysteresis.
CAUTION: Shutdown Mode is unconditional. That is,
the fan will not be activated regardless of the voltage on VIN.
The fan should not be shut down until all heat-producing
activity in the system is at a negligible level.
SENSE Input (FanSenseTM)
The SENSE input, Pin 5, is connected to a low-value
current sensing resistor in the ground return leg of the fan
circuit. During normal fan operation, commutation occurs as
each pole of the fan is energized. This causes brief interrup-
tions in the fan current, seen as pulses across the sense
resistor. If the device is not in Shutdown Mode and pulses
are not appearing at the SENSE input, a fault exists.
The short, rapid change in fan current (high dI/dt)
causes a corresponding dV/dt across the sense resistor,
RSENSE. The waveform on RSENSE is differentiated and
converted to a logic-level pulse-train by CSENSE and the
internal signal processing circuitry. The presence and fre-
quency of this pulse-train is a direct indication of fan opera-
tion. See the Applications section for more details.
FAULT Output
Pulses appearing at SENSE due to the PWM turning on
are blanked and the remaining pulses are filtered by a
Figure 1.
FAULT
SENSE
R3
R1
R4
GND
From
System
Shutdown
Controller
(OPTIONAL)
*The parallel combination of R3 and R4 must be >10K.
Q1
+12V
+5V
VDD
VIN
VMIN
VOUT
RBASE
RSENSE
CSENSE
CF
1
F
CF
TC647
FAN
0.01
CB
1
8
0.01
F
6
7
5
4
2
3
From
Temp
Sensor
+5V
1
0
TC647
Reset
Fault
Detected
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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(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 |
| TC647VPA | 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 |
| TC647VUA | 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 |
| 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 |
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