參數(shù)資料
型號(hào)： TC648VOA
元件分類(lèi)： 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)： 3/28頁(yè)
文件大?。?/td> 602K
代理商： TC648VOA
2002 Microchip Technology Inc.
DS21448C-page 11
TC648
mistor resistance at TMIN. R2 is then calculated to
deliver the desired speed at TMIN. The values for R1, R2
and RT1 are then checked at TMAX for 2.65V nominal.
It may be necessary to adjust the values of R1 and R2
after the initial calculation to obtain the desired results.
The design equations are:
EQUATION
Because the thermistor characteristics are fixed, it may
not be possible, in certain applications, to obtain the
desired values of VMIN and VMAX using the above
equations. In this case, the circuit in Figure 5-4 can be
used. Diode D1 clamps VIN to the voltage required to
sustain minimum speed. The calculations of R1 and
R2 for the temperature sensor are identical to the
equation on the previous page.
FIGURE 5-4:
Minimum Fan Speed Circuit.
5.3
Auto-Shutdown Temperature
Design
A voltage divider on VAS sets the temperature at which
the part is automatically shut down if the sensed
temperature at VIN drops below the set temperature at
VAS (i.e. VIN < VAS).
As with the VIN input, 1.25V to 2.65V corresponds to
the temperature range of interest from T1 to T2,
respectively. Assuming that the temperature sensor
network designed previously is linearly related to
temperature, the shutdown temperature TAS is related
to T2 and T1 by:
EQUATION
For example, if 1.25V and 2.65V at VIN corresponds to
a temperature range of T1 = 0°C to T2 = 125°C, and the
auto-shutdown temperature desired is 25°C, then the
VAS voltage is:
EQUATION
The VAS voltage may be set using a simple resistor
divider, as shown in Figure 5-5.
FIGURE 5-5:
VAS Circuit.
R1 = (0.1)(RT1MIN)
Where: RT1 = Thermistor resistance at TMIN
R2 =
(RT1MIN)(R1)(VMIN)
(RT1MIN + R1)(VDD - VMIN)
Where VMIN = the value of VIN required for
minimum fan speed. VDD = Power Supply Voltage
VMAX =
(RT1MIN)(R1)(VMIN)
R2 (R1 + RT1MAX )(VDD)
Where RT1MAX = thermistor resistance at TMAX,
VMAX = the value of VIN required for maximum
fan speed.
R1
R2
R3
R4
D1
RT1
VDD
VIN
2.65 - 1.25V
T2 - T1
=
VAS - 1.25
TAS - T1
VAS =
1.4V
T2 - T1
(TAS - T1) + 1.25
(
)
1.4V
(125 - 0)
VAS =
(25 - 0) + 1.25 = 1.53V
R2
R1
GND
VDD
VAS
IDIV
IIN
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
TC648VOA 制造商:Microchip Technology Inc 功能描述:Fan Management Controller IC Package/Cas
TC648VOA713 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(lèi)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
TC648VPA 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(lèi)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
TC648VPA 制造商:Microchip Technology Inc 功能描述:Fan Management Controller IC
TC648VUA 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(lèi)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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