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參數資料
| 型號： | THMC40SOPD |
| 廠商： | Texas Instruments, Inc. |
| 元件分類： | 基準電壓源/電流源 |
| 英文描述： | VARIABLE SPEED 12-VDC BRUSHLESS FAN MOTOR DRIVERS |
| 中文描述： | 變速12伏直流無刷風扇電機驅動器 |
| 文件頁數： | 12/17頁 |
| 文件大小： | 238K |
| 代理商： | THMC40SOPD |
THMC40, THMC41
VARIABLE SPEED 12-VDC BRUSHLESS FAN MOTOR DRIVERS
SLIS097 – MARCH 2000
12
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
locked rotor protection
An internal digital timer monitors the output of the Hall sensor amplifier. When a change in commutation state
is not observed within one second (typical with 2200 pF C
OSC
), the V
OUT
, PHA, and PHB outputs are disabled
for eight seconds (typical with 2200 pF C
OSC
). After the outputs have been disabled for eight seconds (typical
with 2200 pF C
OSC
), the THMC40 and THMC41 re-enable the V
OUT
, PHA, and PHB outputs to automatically
restart the motor after a locked rotor condition. If the locked rotor condition still exists, the above process repeats
itself until the condition is removed, or the THMC40 and THMC41 are powered down (see Figure 9).
NOTE:
The locked rotor detection time and auto-retry time are proportional to the PWM frequency, and
therefore to the value of C
OSC
. With a C
OSC
value of 2200 pF, the PWM frequency is typically
22.7 kHz, locked rotor detection time is typically one second, and auto-retry time is typically
eight seconds.
1s
Hall Sensor
Comparator
Output
1s
8s
8s
VOUT, PHA and
PHB Output
Enable
RD Output
(THMC41)
Tach Output
(THMC40)
Figure 9. Typical Locked Rotor Protection Timing Waveforms
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