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参数资料
| 型号： | THMC40DR |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 运动控制电子 |
| 英文描述： | BRUSHLESS DC MOTOR CONTROLLER, 1.5 A, PDSO14 |
| 封装： | PLASTIC, SOP-14 |
| 文件页数： | 2/19页 |
| 文件大小： | 300K |
| 代理商： | THMC40DR |
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 (VPWM) – dc control voltage input
The voltage at the VPWM terminal determines the PWM duty cycle of the output (VOUT) to control drive power
to the fan motor, and thus control fan speed (see Figures 3 and 6). The VPWM voltage is internally compared
against the 0.5-V to 2.3-V triangle waveform generated on the COSC terminal. The PWM signal output from this
comparator has a duty cycle proportional to the voltage at VPWM, as shown in Figure 6. The output of this
comparator is used as the PWM input to the VOUT 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
–
Duty
Cycle
–
%
V
OUT
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 VOUT Duty Cycle, VSTART, and VSLEEP vs VPWM Input Voltage
PWM duty cycle control voltage (VPWM) – 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-F RC filter between the speed control wire and the VPWM
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
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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相关代理商/技术参数 |
参数描述 |
|---|---|
| THMC40SOPD | 制造商:TI 制造商全称:Texas Instruments 功能描述:VARIABLE SPEED 12-VDC BRUSHLESS FAN MOTOR DRIVERS |
| THMC41 | 制造商:TI 制造商全称:Texas Instruments 功能描述:VARIABLE SPEED 12-VDC BRUSHLESS FAN MOTOR DRIVERS |
| THMC41SOPD | 制造商:TI 制造商全称:Texas Instruments 功能描述:VARIABLE SPEED 12-VDC BRUSHLESS FAN MOTOR DRIVERS |
| THMC45 | 制造商:TI 制造商全称:Texas Instruments 功能描述:5-V AND 3.3-V DC BRUSHLESS FAN MOTOR DRIVER WITH SINGLE WIRE CONTOL |
| THMC50 | 制造商:TI 制造商全称:Texas Instruments 功能描述:REMOTE/LOCAL TEMPERATURE MONITOR AND FAN CONTROLLER WITH SMBus INTERFACE |
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