參數(shù)資料
型號(hào)： TC648BEOA
元件分類： 運(yùn)動(dòng)控制電子
英文描述： BRUSHLESS DC MOTOR CONTROLLER, PDSO8
封裝： 0.150 INCH, PLASTIC, SOIC-8
文件頁(yè)數(shù)： 17/36頁(yè)
文件大小： 704K
代理商： TC648BEOA
TC646B/TC648B/TC649B
DS21755B-page 24
2003 Microchip Technology Inc.
Step 2: Selecting the Fan Controller.
The requirements for the fan controller are that it have
auto-shutdown capability at 20C and also indicate a
fan fault condition. No over-temperature indication is
necessary. From these specifications, the proper
selection is the TC649B device.
Step 3: Setting the PWM Frequency.
The fan is rated at 4200 RPM with a 12V input. The
goal is to run to a 40% duty cycle (roughly 40% fan
speed), which equates to approximately 1700 RPM. At
1700 RPM, one full fan revolution occurs every
35 msec. The fan being used is a four-pole fan that
gives four current pulses per revolution. With this infor-
mation, and viewing test results at 40% duty cycle, two
fan current pulses were always seen during the PWM
on time with a PWM frequency of 30 Hz. For this rea-
son, the CF value is selected to be 1.0 F.
Step 4: Setting the VIN Voltage.
From the design criteria, the desired duty cycle at 20C
is 40% and full fan speed should be reached at 40C.
Based on a VIN voltage range of 1.20V to 2.60V, which
represents 0% to 100% duty cycle, the 40% duty cycle
voltage can be found using the following equation:
EQUATION
Using the above equation, the VIN values are
calculated to be:
-VIN (40%) = 1.76V
-VIN (100%) = 2.60V
Using these values along with the thermistor resistance
values calculated earlier, the R1 and R2 resistor values
can now be calculated using the following equation:
EQUATION
RTEMP is the parallel combination of R1 and the ther-
mistor. V(T1) represents the VIN voltage at 20C and
V(T2) represents the VIN voltage at 40C. Solving the
equations simultaneously yields the following values
(VDD = 5V):
-R1 = 238,455
-R2 = 45,161
Using standard 1% resistor values, the selected R1 and
R2 values are:
-R1 = 237 k
-R2 = 45.3 k
A graph of the VIN voltage, thermistor resistance and
RTEMP resistance versus temperature for this
configuration is shown in Figure 5-10.
FIGURE 5-10:
Thermistor Resistance, VIN
and RTEMP vs. Temperature
Step 5: Setting the Auto-Shutdown Voltage (VAS).
Setting the voltage for the auto-shutdown is done using
a simple resistor voltage divider. The criteria for the
voltage divider in this design is that it draw no more
than 100 A of current. The required auto-shutdown
voltage was determined earlier in the selection of the
VIN voltage at 40% duty cycle, since this was also set
at the temperature that auto-shutdown is to occur
(20C).
-VAS = 1.76V
Given this desired setpoint and knowing the desired
divider current, the following equations can be used to
solve for the resistor values for R3 and R4:
EQUATION
Using the equations above, the resistor values for R3
and R4 are found to be:
-R3 = 32.4 k
-R4 = 17.6 k
Using standard 1% resistor values yields the following
values:
-R3 = 32.4 k
-R4 = 17.8 k
VIN = (DC * 1.4V) + 1.20V
DC = Desired Duty Cycle
VT1
()
VDD R2
×
RTEMP T1
() R2
+
------------------------------------------
=
VT2
()
VDD R2
×
RTEMP T2
() R2
+
------------------------------------------
=
0
50
100
150
200
250
300
350
400
0
1020
3040
5060
7080
90
Temperature (C)
Network
Resistance
(k
)
0.00
0.50
1.00
1.50
2.00
2.50
3.00
3.50
4.00
4.50
5.00
V
IN
(V)
VIN
NTC Thermistor
100 k @ 25C
RTEMP
IDIV =
5V
R3 + R4
VAS =
5V * R4
R3 + R4
相關(guān)PDF資料
PDF描述
TC649BEUATR BRUSHLESS DC MOTOR CONTROLLER, PDSO8
TC646BEOA713 BRUSHLESS DC MOTOR CONTROLLER, PDSO8
TC649VOART BRUSHLESS DC MOTOR CONTROLLER, PDSO8
TC649VUATR BRUSHLESS DC MOTOR CONTROLLER, PDSO8
TC649VOATR BRUSHLESS DC MOTOR CONTROLLER, PDSO8
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
TC648BEOA713 功能描述:馬達(dá)/運(yùn)動(dòng)/點(diǎn)火控制器和驅(qū)動(dòng)器 Shtdn & Over-T Alert 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
TC648BEOAG 制造商:Microchip Technology 功能描述:PWM Fan Motor Speed Controller 8-Pin SOIC N Tube
TC648BEOATR 制造商:MICROCHIP 制造商全稱:Microchip Technology 功能描述:PWM Fan Speed Controllers With Auto-Shutdown, Fan Restart and FanSense⑩ Technology for Fault Detection
TC648BEPA 功能描述:馬達(dá)/運(yùn)動(dòng)/點(diǎn)火控制器和驅(qū)動(dòng)器 Shtdn & Over-T Alert 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
TC648BEPA713 制造商:MICROCHIP 制造商全稱:Microchip Technology 功能描述:PWM Fan Speed Controllers With Auto-Shutdown, Fan Restart and FanSense⑩ Technology for Fault Detection
發(fā)布緊急采購(gòu)，3分鐘左右您將得到回復(fù)。

采購(gòu)需求

(若只采購(gòu)一條型號(hào)，填寫(xiě)一行即可)

發(fā)布成功！您可以繼續(xù)發(fā)布采購(gòu)。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

發(fā)布成功！您可以繼續(xù)發(fā)布采購(gòu)。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

*型號(hào) *數(shù)量 廠商 批號(hào) 封裝
添加更多采購(gòu)

我的聯(lián)系方式

*
*
*