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| 型号： | TC642BEOA713 |
| 元件分类： | 运动控制电子 |
| 英文描述： | BRUSHLESS DC MOTOR CONTROLLER, PDSO8 |
| 封装： | 0.150 INCH, PLASTIC, SOIC-8 |
| 文件页数： | 17/34页 |
| 文件大小： | 683K |
| 代理商： | TC642BEOA713 |
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TC642B/TC647B
DS21756B-page 24
2003 Microchip Technology Inc.
Using standard 1% resistor values yields the following
values:
-R3 = 32.4 k
-R4 = 17.8 k
Step 6: Selecting the Fan Drive Device (Q1).
Since the fan operating current is below 200 mA, a
transistor or MOSFET can be used as the fan drive
device. In order to reduce component count and cur-
rent draw, the drive device for this design is chosen to
be a N-channel MOSFET. Selecting from Table 5-2,
there are two MOSFETs that are good choices: the
MGSF1N02E and the SI2302. These devices have the
same pinout and are interchangeable for this design.
Step 7: Selecting the RSENSE and CSENSE Values.
The goal again for selecting these values is to ensure
that the signal at the SENSE pin is 90 mV in amplitude
under all operating conditions. This will ensure that the
pulses are detected by the TC642B/TC647B device
and that the fan operation is detected.
The fan current waveform is shown in Figure 5-8 and,
as discussed previously, with a waveform of this shape,
the current sense resistor values shown in Table 5-1 are
good reference values. Given that the average fan oper-
ating current was measured to be 120 mA, this falls
between two of the values listed in the table. For refer-
ence purposes, both values have been tested and
these results are shown in Figures 5-11 (4.7
) and 5-12
(3.0
). The selected CSENSE value is 0.1 F as this pro-
vides the appropriate coupling of the voltage to the
SENSE pin.
.
FIGURE 5-11:
SENSE pin voltage with
4.7
sense resistor.
.
FIGURE 5-12:
SENSE pin voltage with
3.0
sense resistor.
Since the 3.0
value of sense resistor provides the
proper voltage to the SENSE pin, it is the correct choice
for this solution as it will also provide the lowest power
dissipation and the most voltage to the fan. Using the
RMS fan current that was measured previously, the
power dissipation in the resistor during a fan fault con-
dition is 71 mW (Irms2 * RSENSE). This number will set
the wattage rating of the resistor that is selected. The
selected value will vary depending upon the derating
guidelines that are used.
Now that all the values have been selected, the sche-
matic representation of this design can be seen in
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| TC647EOATR | BRUSHLESS DC MOTOR CONTROLLER, PDSO8 |
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相关代理商/技术参数 |
参数描述 |
|---|---|
| TC642BEOAG | 制造商:Microchip Technology 功能描述:Fan Control Demo Board |
| TC642BEOATR | 制造商:MICROCHIP 制造商全称:Microchip Technology 功能描述:PWM Fan Speed Controllers With Minimum Fan Speed, Fan Restart and FanSense⑩ Technology for Fault Detection |
| TC642BEPA | 功能描述:马达/运动/点火控制器和驱动器 w/Rstrt & Flt 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 |
| TC642BEPA713 | 制造商:MICROCHIP 制造商全称:Microchip Technology 功能描述:PWM Fan Speed Controllers With Minimum Fan Speed, Fan Restart and FanSense⑩ Technology for Fault Detection |
| TC642BEPATR | 制造商:MICROCHIP 制造商全称:Microchip Technology 功能描述:PWM Fan Speed Controllers With Minimum Fan Speed, Fan Restart and FanSense⑩ Technology for Fault Detection |
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