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參數(shù)資料
| 型號(hào)： | THMC41SOPD |
| 廠商： | Texas Instruments, Inc. |
| 元件分類： | 基準(zhǔn)電壓源/電流源 |
| 英文描述： | VARIABLE SPEED 12-VDC BRUSHLESS FAN MOTOR DRIVERS |
| 中文描述： | 變速12伏直流無刷風(fēng)扇電機(jī)驅(qū)動(dòng)器 |
| 文件頁數(shù)： | 10/17頁 |
| 文件大?。?/td> | 238K |
| 代理商： | THMC41SOPD |
THMC40, THMC41
VARIABLE SPEED 12-VDC BRUSHLESS FAN MOTOR DRIVERS
SLIS097 – MARCH 2000
10
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
PWM duty cycle control voltage (V
PWM
) – dc control voltage input
The voltage at the V
PWM
terminal determines the PWM duty cycle of the output (V
OUT
) to control drive power
to the fan motor, and thus control fan speed (see Figures 3 and
6). The V
PWM
voltage is internally compared
against the 0.5-V to 2.3-V triangle waveform generated on the C
OSC
terminal. The PWM signal output from this
comparator has a duty cycle proportional to the voltage at V
PWM
, as shown in Figure 6. The output of this
comparator is used as the PWM input to the V
OUT
drive stage.
50
40
20
10
0
90
30
0
0.2
0.4
0.6
0.8
1
1.2
70
60
80
100
1.4
1.6
1.8
2.4
–
V
2
2.2
VPWM – Input Voltage – V
RUN STATE
SLEEP
STATE
VSLEEP=0.7 V
VSTART= 0.8 V
Must be exceeded
to enter run state
VOUT Duty Cycle =
(VPWM - 0.5)/1.8
×
100
Figure 6. Relationship of V
OUT
Duty Cycle, V
START
, and V
SLEEP
vs V
PWM
Input Voltage
PWM duty cycle control voltage (V
PWM
) – digital PWM control input
To allow control of the THMC40 and THMC41 by either a PWM or a dc input control signal, it is recommended
that the fan manufacturer includes a 100-k
, 0.1-
μ
F RC filter between the speed control wire and the V
PWM
terminal (see Figure 7). This method allows the end user to control the fan speed with either a PWM signal or
a dc control voltage. Many PC Super I/O ICs and hardware monitoring ICs provide one of the two fan speed
control outputs. Therefore, fans with THMC40 and THMC41 ICs can be used with a wide variety of control
schemes to provide variable fan speed without an external fan drive power stage.
C = 0.1
μ
F
VPWM
PWM Generator
(Super I/O or
HW Monitor)
PC Motherboard
Inside Cooling Fan
R = 100 k
THMC40
and
THMC41
Full Speed Option
VFAN
Speed
Control
1 – 10 M
1 – 10 M
Sleep State Option
Optional resistors control fan operation with open speed control input.
Figure 7. PWM Input Control With RC Filter Inside the Cooling Fan
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