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參數(shù)資料
| 型號： | TC655EUNTR |
| 元件分類： | 運動控制電子 |
| 英文描述： | BRUSHLESS DC MOTOR CONTROLLER, PDSO10 |
| 封裝： | PLASTIC, MSOP-10 |
| 文件頁數(shù)： | 19/36頁 |
| 文件大?。?/td> | 706K |
| 代理商： | TC655EUNTR |
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TC654/TC655
DS21734A-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 TC654/TC655 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 TC654/TC655
device ground, individual ground returns for the TC654/
TC655 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 TC654/TC655 must be pro-
grammed for the proper number of fan current pulses
per revolution. This is done by setting the F2PPR and
F1PPR bits 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,
F2PPR (bits 4-3<01>) and F1PPR (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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