參數(shù)資料
型號(hào)： TC665EUN
元件分類： 運(yùn)動(dòng)控制電子
英文描述： BRUSHLESS DC MOTOR CONTROLLER, PDSO10
封裝： PLASTIC, MSOP-10
文件頁(yè)數(shù)： 19/36頁(yè)
文件大?。?/td> 695K
代理商： TC665EUN
TC664/TC665
DS21737A-page 26
2002 Microchip Technology Inc.
FIGURE 7-8:
Clamp Diode For Fan Turn-
off.
7.6
Bias Supply Bypassing and Noise
Filtering
The bias supply (VDD) for the TC664/TC665 devices
should be bypassed with a 1 F ceramic capacitor. This
capacitor will help supply the peak currents that are
required to drive the base/gate of the external fan drive
devices.
As the VIN pin controls the duty cycle in a linear fashion,
any noise on this pin can cause duty cycle jittering. For
this reason, the VIN pin should be bypassed with a
0.01 F capacitor.
In order to keep fan noise off of the TC664/TC665
device ground, individual ground returns for the TC664/
TC665 and the low side of the fan current sense resis-
tor should be used.
7.7
Determining Current Pulses Per
Revolution of Fans
There are many different fan designs available in the
marketplace today. The motor designs can vary and,
along with it, the number of current pulses in one fan
revolution. In order to correctly measure and commu-
nicate the fan speed, the TC664/TC665 devices must
be programmed for the proper number of fan current
pulses per revolution. This is done by setting the FPPR
bit in the Configuration Register to the proper values
(see Section 6.3 for settings). A fan's current pulses
per revolution can be determined in the following
manner.
The first piece of information required is the fan's full
speed RPM rating. The fan RPM rating can then be
converted to give the time for one revolution using the
following equation:
EQUATION
The fan current can now be monitored over this time
period. The number of pulses occurring in this time
period is the fan's "Current Pulses per Rotation" rating
which is needed in order to accurately read fan RPM.
Example: The full speed fan RPM rating is 8200 RPM.
From this, the time for one fan revolution is calculated
to be 7.3 msec, using the previously discussed equa-
tion. Using a current probe, the fan current can be mon-
itored as the fan is operating at full speed. Figure 7-9
shows the fan current pulses for this example. The
7.44 msec window, marked by the cursors, is very near
the 7.3 msec calculated above and is within the toler-
ance of the fan ratings. Four current pulses occur within
this 7.44 msec time frame. Given this information,
FPPR (bits 2-1<01>) in the Configuration Register
should be set to '10' to indicate 4 current pulses per
revolution.
FIGURE 7-9:
Four Current Pulses Per
Revolution Fan.
7.8
How to Eliminate False Current
Pulse Sensing
During the PWM mode of operation, some fans will
generate an extra current pulse. This pulse occurs
when the external drive device is turned on and is, in
most cases, caused by the fan's electronics that control
the fan motor. This pulse does not represent true fan
current and needs to be blanked out. This is particularly
important for detecting a fan in a locked rotor condition.
Q1
GND
RSENSE
VOUT
Q1 - N-Channel MOSFET
FAN
Time for one revolution (msec.)
60 1000
×
Fan RPM
------------------------
=
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參數(shù)描述
TC665EUNTR 功能描述:馬達(dá)/運(yùn)動(dòng)/點(diǎn)火控制器和驅(qū)動(dòng)器 Single 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
TC67 功能描述:鋁質(zhì)電解電容器 - 帶引線 40uF 350V RoHS:否 制造商:Kemet 引線類型: 電容:220 uF 容差:20 % 電壓額定值:25 V 工作溫度范圍: 端接類型:Radial 外殼直徑:8 mm 外殼長(zhǎng)度:11 mm 引線間隔:5 mm 產(chǎn)品:General Purpose Electrolytic Capacitors 封裝:Bulk
TC670 制造商:MICROCHIP 制造商全稱:Microchip Technology 功能描述:Tiny Predictive Fan Failure Detector
TC670_03 制造商:MICROCHIP 制造商全稱:Microchip Technology 功能描述:Tiny Predictive Fan Failure Detector
TC670_13 制造商:MICROCHIP 制造商全稱:Microchip Technology 功能描述:Tiny Predictive Fan Failure Detector
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