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參數(shù)資料
| 型號： | TC646EUA |
| 元件分類： | 運動控制電子 |
| 英文描述： | BRUSHLESS DC MOTOR CONTROLLER, PDSO8 |
| 封裝： | PLASTIC, MSOP-8 |
| 文件頁數(shù)： | 6/28頁 |
| 文件大?。?/td> | 473K |
| 代理商： | TC646EUA |
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TC646
DS21446C-page 14
2002 Microchip Technology Inc.
A base-current limiting resistor is required with bipolar
transistors. This is shown in Figure 5-6.
FIGURE 5-6:
Circuit For Determining
RBASE.
The correct value for this resistor can be determined as
follows:
VOH
= VRSENSE + VBE(SAT) + VRBASE
VRSENSE = IFAN x RSENSE
VRBASE
= RBASE x IBASE
IBASE
= IFAN / hFE
“Electrical Characteristics”; VBE(SAT) is given in the
chosen transistor data sheet. It is now possible to solve
for RBASE.
EQUATION
Some applications benefit from the fan being powered
from a negative supply to keep motor noise out of the
positive supply rails. This can be accomplished as
power supply voltage, holding transistor Q1 off when
VOUT is low. When VOUT is high, the voltage at the
anode of D1 increases by VOUT, causing Q1 to turn on.
Operation is otherwise the same as in the case of fan
operation from +12V.
FIGURE 5-7:
Output Drive Transistor Circuit Topologies.
Q1
GND
VDD
RSENSE
RBASE
VOH = 80% VDD
+ V
RBASE
–
VBE
(SAT)
–
+
VR
SENSE
–
Fan
+
RBASE =
VOH - VBE(SAT) - VRSENSE
IBASE
Q1
Q2
GND
VDD
RSENSE
RBASE
VOUT
Fan
a) Single Bipolar Transistor
Q1
GND
VDD
RSENSE
VOUT
c) N-Channel MOSFET
GND
VDD
RSENSE
RBASE
Fan
b) Darlington Transistor Pair
Fan
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| TC646EUA713 | 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(fēng)格:SMD/SMT 封裝 / 箱體:HTSSOP-28 封裝:Tube |
| TC646VOA | 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(fēng)格:SMD/SMT 封裝 / 箱體:HTSSOP-28 封裝:Tube |
| TC646VOA713 | 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(fēng)格:SMD/SMT 封裝 / 箱體:HTSSOP-28 封裝:Tube |
| TC646VPA | 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(fēng)格:SMD/SMT 封裝 / 箱體:HTSSOP-28 封裝:Tube |
| TC646VUA | 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(fēng)格:SMD/SMT 封裝 / 箱體:HTSSOP-28 封裝:Tube |
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