参数资料
| 型号： | TC642EV |
| 厂商： | Microchip Technology |
| 文件页数： | 12/16页 |
| 文件大小： | 0K |
| 描述： | KIT EVALUATION FOR TC642 |
| 标准包装： | 1 |
| 其它名称： | Q698359 |
TC64X/TC64XB Fan Control Evaluation Board User’s Guide
2.3
OPERATION IN THE ADJUSTABLE OUTPUT VOLTAGE MODE
2.3.1
Output Driver
Transistors such as 2N2222A are recommended for use as the output driver. These
transistors are low cost, multiple sourced and have a high enough Beta for BDC fan
applications of 200 mA or less operating current. If a single transistor is used, care
must be taken to select a transistor having a minimum h FE of 50 to ensure that the
minimum output current specification (5 mA) of the TC64X and TC64XB devices are
not exceeded. For large BDC fans, a logic level MOSFET is a good choice for the drive
device. All component selections should be made based on information in the
“Applications” section of the TC64X and TC64XB data sheets.
applications. The values in Table 2-2 assume the use of low-cost, bipolar transistors
(such as the 2N2222A).
Substituting a logic level MOSFET, such as a BS170, for Q 2 , results in lower system
voltage losses and significantly reduces output loading on the TC64X and TC64XB
devices. The low R DSON of the MOSFET (1 ? in the case of the BS170) enables it to be
used in place of the Darlington in high current fan applications (See the TC64X and
TC64XB individual data sheets’ “Applications” section for details). The pinout of many
logic level MOSFETs is reversed from that of bipolar junction transistors, so care must
be taken to properly orient the MOSFET.
TABLE 2-2:
OUTPUT DRIVE DEVICE CONFIGURATIONS
Full Speed Fan
Motor Current
50 mA
100 mA
150 mA
200 mA
200 mA
250 mA
300 mA
350 mA
400 mA
450 mA
Darlington
Pair/MOSFET*
—
—
—
—
X
X
X
X
X
X
Single
Transistor
X
X
X
X
—
—
—
—
—
—
R 2
( ? )
2.4 k
1.1 k
750
620
5.6 k
4.7 k
3.9 k
3.3 k
3.0 k
2.4 k
R 3
( ? )
9.1
4.7
3.0
2.4
2.4
2.0
1.8
1.5
1.3
1.2
* R 2 is not necessary when using a MOSFET as the drive device.
2.3.2
Sensor Interface Circuit
The TC64X and TC64XB data sheets provide detailed information relating to the
design of a temperature sensor based on a low cost thermistor.
DS21403C-page 8
? 2003 Microchip Technology Inc.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| TC642EV | 制造商:Microchip Technology Inc 功能描述:Tools Development kit For Use |
| TC642VOA | 功能描述:马达/运动/点火控制器和驱动器 w/Fault Dtct RoHS:否 制造商:STMicroelectronics 产品:Stepper Motor Controllers / Drivers 类型:2 Phase Stepper Motor Driver 工作电源电压:8 V to 45 V 电源电流:0.5 mA 工作温度:- 25 C to + 125 C 安装风格:SMD/SMT 封装 / 箱体:HTSSOP-28 封装:Tube |
| TC642VOA713 | 功能描述:马达/运动/点火控制器和驱动器 w/Fault Dtct RoHS:否 制造商:STMicroelectronics 产品:Stepper Motor Controllers / Drivers 类型:2 Phase Stepper Motor Driver 工作电源电压:8 V to 45 V 电源电流:0.5 mA 工作温度:- 25 C to + 125 C 安装风格:SMD/SMT 封装 / 箱体:HTSSOP-28 封装:Tube |
| TC642VPA | 功能描述:马达/运动/点火控制器和驱动器 w/Fault Dtct RoHS:否 制造商:STMicroelectronics 产品:Stepper Motor Controllers / Drivers 类型:2 Phase Stepper Motor Driver 工作电源电压:8 V to 45 V 电源电流:0.5 mA 工作温度:- 25 C to + 125 C 安装风格:SMD/SMT 封装 / 箱体:HTSSOP-28 封装:Tube |
| TC642VUA | 功能描述:马达/运动/点火控制器和驱动器 w/Fault Dtct RoHS:否 制造商:STMicroelectronics 产品:Stepper Motor Controllers / Drivers 类型:2 Phase Stepper Motor Driver 工作电源电压:8 V to 45 V 电源电流:0.5 mA 工作温度:- 25 C to + 125 C 安装风格:SMD/SMT 封装 / 箱体:HTSSOP-28 封装:Tube |
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