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參數(shù)資料
| 型號(hào)： | TC647VOART |
| 元件分類： | 運(yùn)動(dòng)控制電子 |
| 英文描述： | BRUSHLESS DC MOTOR CONTROLLER, PDSO8 |
| 封裝： | SOIC-8 |
| 文件頁數(shù)： | 3/15頁 |
| 文件大?。?/td> | 117K |
| 代理商： | TC647VOART |
11
TC647-2
12/05/00
TC647
PWM Fan Speed Controller with FanSense*
2001 Microchip Technology Inc.
DS21447A
Figure 10. Powering Fan From –12V Supply
GND
+5V
Q1
VDD
V
OUT
TC647
FAN
R2
2.2k
R3
2.2
R4
10k
D2
12.0V
Zener
– 12V
VOH = VSENSE + VBE(SAT) + VRBASE
VRSENSE = IFAN x RSENSE
VRBASE = RBASE x IBASE
IBASE= IFAN / hFE
Equation 7.
VOH is specified as 80% of VDD in the Electrical
Characteristics table; VBE(SAT) is given in the transistor
datasheet. It is now possible to solve for RBASE.
RBASE = VOH – VBE(SAT) – VRSENSE
IRBASE
Equation 8.
Some applications require the fan to be powered from
the negative 12V supply to keep motor noise out of the
positive voltage power supplies. As shown in Figure 10,
Zener diode D2 offsets the –12V power supply voltage
holding transistor Q1 OFF when VOUT is LOW. When VOUT
is HIGH, the voltage at the anode of D2 increases by VOH,
causing Q1 to turn ON. Operation is otherwise the same as
the case of fan operation +12V.
Latch-up Considerations
As with any CMOS IC, the potential exists for latch-up if
signals are applied to the device which are outside the power
supply range. This is of particular concern during power-up
if the external circuitry, such as the sensor network, VMIN
divider, shutdown circuit, or fan, are powered by a supply
different from that of the TC647. Care should be taken to
ensure that the TC647’s VDD supply powers-up first. If
possible, the networks attached to VIN and VMIN should
connect to the VDD supply at the same physical location as
the IC itself. Even if the IC and any external networks are
powered by the same supply, physical separation of the
connecting points can result in enough parasitic capaci-
tance and/or inductance in the power supply connections to
delay one power supply “routing” versus another.
Power Supply Routing and Bypassing
Noise present on the VIN and VMIN inputs may cause
erroneous operation of the FAULT output. As a result, these
inputs should be bypassed with a 0.01
F capacitor mounted
as close to the package as possible. This is particularly true
of VIN, which usually is driven from a high impedance source
(such as a thermistor). In addition, the VDD input should be
bypassed with a 1
F capacitor. Grounds should be kept as
short as possible. To keep fan noise off the TC647 ground
pin, individual ground returns for the TC647 and the low side
of the fan current sense resistor should be used.
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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(dòng)/點(diǎn)火控制器和驅(qū)動(dòng)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(dòng)/點(diǎn)火控制器和驅(qū)動(dòng)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(dòng)/點(diǎn)火控制器和驅(qū)動(dòng)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(dòng)/點(diǎn)火控制器和驅(qū)動(dòng)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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