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參數(shù)資料
| 型號(hào)： | THMC40SOPD |
| 廠商： | Texas Instruments, Inc. |
| 元件分類(lèi)： | 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(wú)刷風(fēng)扇電機(jī)驅(qū)動(dòng)器 |
| 文件頁(yè)數(shù)： | 11/17頁(yè) |
| 文件大?。?/td> | 238K |
| 代理商： | THMC40SOPD |
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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 (V
PWM
) – digital PWM control input (continued)
Figure 8 illustrates the relationship between V
OUT
output duty-cycle and a 0–3.3-V digital PWM input control
signal.
–
V
3.3-V Duty Cycle Input to RC Filter
50
40
20
10
0
90
30
0
10
20
30
40
50
60
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 V
OUT
Duty Cycle, V
SLEEP
, V
START
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 V
PWR
(fan) supply current requirements (300
μ
A typical) when cooling fan operation is not required.
This feature is especially beneficial for PC OEMs needing to meet the instantly availablePC requirements
without the use of additional external circuitry.
The sleep state is engaged when the V
PWM
input voltage is below the V
SLEEP
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, V
PWM
must exceed the V
START
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 V
OUT
, PHA, and PHB are active and the V
PWM
voltage can be decreased to obtain
minimum fan speed down to the V
SLEEP
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 V
PWM
input voltage relationship to sleep mode and V
OUT
duty cycle.
A control device with a voltage range of 0 V to 2.5 V is recommended to provide the adjustable V
PWM
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 T
TSD
, the thermal shutdown threshold (165
°
C typical), all output drivers are turned off. Once T
TSD
has
been exceeded, the die temperature must fall below a hysteresis temperature (typical T
TSD
–15
°
C) before the
output drivers are re-enabled.
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相關(guān)代理商/技術(shù)參數(shù) |
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|---|---|
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| THMC50 | 制造商:TI 制造商全稱(chēng):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 |
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