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參數資料
| 型號： | THMC45DGNR |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 運動控制電子 |
| 英文描述： | BRUSHLESS DC MOTOR CONTROLLER, PDSO8 |
| 封裝： | PLASTIC, MSOP-8 |
| 文件頁數： | 11/15頁 |
| 文件大?。?/td> | 255K |
| 代理商： | THMC45DGNR |
THMC45
5V AND 3.3V DC BRUSHLESS FAN MOTOR DRIVER
WITH SINGLE WIRE CONTROL
SLIS101A MAY 2001
5
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
ac electrical characteristics, VPWR = 5 V, TA = 30°C to 80°C (unless otherwise noted)
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNIT
fPWM
PWM input frequency
18
30
50
kHz
t(SLEEP)
Time to enter sleep state after no transitions on PWM
terminal
See Figure 5
2
ms
t(PW)
Tachometer signal pulse width
See Figure 4
1
s
td
Delay after rising edge of PWM input for TACH signal
See Figure 4
1
s
tRD
Locked rotor detect delay time
See Figure 6
1
s
tRETRY
Auto-restart delay time
See Figure 6
8
s
t(de-glitch)
Hall transition valid time for commutation to occur
See Figures 1 and 4
25
s
t(PWM_de-glitch)
De-glitch time for PWM input to prevent TACH current
pulses from falsely triggering PWM
See Figure 5
25
s
tf(OUT)
OUTA, OUTB output fall time
See Note 5
200
ns
tr(OUT)
OUTA, OUTB output rise time
See Note 5
200
ns
NOTE 5: Design target only. Not tested in production.
thermal resistance
PARAMETER
TEST CONDITIONS
MIN
MAX
UNIT
RθJ(SYS) Thermal resistance, in system
2 oz. copper traces, JEDEC low K board, 0 LFPM airflow
58.4
°C/W
RθJC
Thermal resistance, junction-to-case
Exposed back-side die mount
4.7
°C/W
PRINCIPLES OF OPERATION
general overview
The THMC45 is a dc BLM driver and control device designed for use with low-voltage (5 V or 3.3 V) dc cooling
fans having two-phase motors with a single winding, bipolar-wound stator. The device is intended primarily for
low-voltage cooling fan applications requiring speed control with a tachometer feedback signal to ensure normal
fan operation. The output drive PWM duty cycle and frequency are dependent on the input signal on the PWM
terminal. The device has an internal Hall sensor amplifier and signal conditioning with drive commutation logic,
a low power sleep-state mode, and locked rotor protection with automatic restart after a locked rotor condition.
The PWM terminal is used to input PWM frequency and duty cycle, to output a tachometer current pulse
feedback signal, and to provide a means for entering sleep and run states. The THMC45 provides a more
effective drive solution to fan RPM control than either external linear voltage regulation or external PWM drive.
The device is offered in an MSOP-8 miniature surface-mount package to meet the critical space constraints of
PCB designs of small low-voltage fans typically found in notebook PCs.
supply voltage input (VPWR)
The VPWR terminal serves as the voltage supply input to the THMC45. A 0.1-F bypass capacitor should be
placed as close to this terminal as layout permits.
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