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参数资料
| 型号： | THMC41DR |
| 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： | 3/19页 |
| 文件大小： | 300K |
| 代理商： | THMC41DR |
THMC40, THMC41
VARIABLE SPEED 12-VDC BRUSHLESS FAN MOTOR DRIVERS
SLIS097 – MARCH 2000
11
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
PWM duty cycle control voltage (VPWM) – digital PWM control input (continued)
Figure 8 illustrates the relationship between VOUT output duty-cycle and a 0–3.3-V digital PWM input control
signal.
–
Duty
Cycle
–
%
V
OUT
3.3-V Duty Cycle Input to RC Filter
50
40
20
10
0
90
30
0
10
2030
405060
70
60
80
100
70
80
90
100
RUN STATE
SLEEP
STATE
VOUT % =((3.3 V ×
(Input%
÷100)-0.5)÷1.8) × 100
VSLEEP=21%
VSTART = 24%
Must be exceeded to
enter run state
Figure 8. Relationship of VOUT Duty Cycle, VSLEEP, VSTART vs 0–3.3 V PWM Input Duty Cycle
sleep/run state
Sleep-state and run-state modes are provided, as illustrated in Figures 6 and 8. The sleep state is intended to
minimize VPWR (fan) supply current requirements (300 A typical) when cooling fan operation is not required.
This feature is especially beneficial for PC OEMs needing to meet the
instantly available PC requirements
without the use of additional external circuitry.
The sleep state is engaged when the VPWM input voltage is below the VSLEEP threshold (0.7 V typical, 11.1%
duty cycle). During the sleep state, all output drivers are turned off and any unused circuits are powered down
to minimize current drain. Once sleep state is engaged, VPWM must exceed the VSTART threshold (0.8 V typical,
17% duty cycle) to disable the sleep state and enter the run state, allowing the motor to be driven. Once the
run state is engaged, outputs VOUT, PHA, and PHB are active and the VPWM voltage can be decreased to obtain
minimum fan speed down to the VSLEEP threshold. This procedure allows the user to overcome initial motor
stiction with a PWM duty cycle of 17% to avoid the possibility of false locked rotor detection during initial start-up.
See Figure 6 for the VPWM input voltage relationship to sleep mode and VOUT duty cycle.
A control device with a voltage range of 0 V to 2.5 V is recommended to provide the adjustable VPWM reference
voltage to the THMC40 and THMC41. A 2.5-V DAC is an optimal choice as the controlling circuitry, whether as
a stand-alone device, or as an integrated function in a multiple-function device. Using a control device without
a minimum 0.5-V to 2.3-V range reduces the RPM control range of the fan motor and may not allow duty-cycle
settings of 0% and/or 100%.
thermal shutdown
The THMC40 and THMC41 provide protection against excessive device temperature with a thermal sensor that
monitors the die temperature. Should some operating or abnormal condition cause the die temperature to
exceed TTSD, the thermal shutdown threshold (165°C typical), all output drivers are turned off. Once TTSD has
been exceeded, the die temperature must fall below a hysteresis temperature (typical TTSD –15°C) before the
output drivers are re-enabled.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| 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 |
| THMC50DBQR | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| THMC50SSOPDBQ | 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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