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參數資料
| 型號： | THMC45 |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 運動控制電子 |
| 英文描述： | BRUSHLESS DC MOTOR CONTROLLER, 0.25 A, PDSO8 |
| 封裝： | PLASTIC, HTSSOP-8 |
| 文件頁數： | 5/14頁 |
| 文件大小： | 157K |
| 代理商： | THMC45 |
PRODUCT PREVIEW documents contain information on new
products in the definition Phase. Characteristic data and other
data specifications are subject to change without notice. This
document is to be used for discussion only and should not be
used as the basis for any design.
thmc45.doc
Copyright
2000 Texas Instruments
!TI Strictly Private !
13
THMC45
SINGLE-PHASE 5VDC BRUSHLESS FAN DRIVER WITH SINGLE WIRE CONTROL INTERFACE
Product Preview
Sleep/Run States Using PWM Input Pin (PWM)
The THMC45 will enter a low-current sleep state if a transition is not seen on the PWM input for 200s.
Once in sleep state, the OUTA and OUTB outputs will be in a high-impedance state, and the HBIAS
output will float to allow the hall sensor bias current to be switched off. This allows the entire fan
assembly to enter a low-current sleep state, and thus eliminates the need for an external FET to turn
the fan off when the cooling fan is not needed. The THMC45 will go from sleep state to run state on the
first rising edge on the PWM input pin. Figure 6 shows the timing relationships between the PWM
signal and sleep/run state.
Figure 6: PWM Input Signal, Sleep State, and Run State Timing
Hall Effect Sensor Biasing Switch Output (HBIAS)
The HBIAS output on the THMC45 works in conjunction with the sleep-state function to de-bias the hall
effect sensor in the fan assembly during sleep state. It is essentially an open-drain output that removes
ground from the hall sensor bias when THMC45 enters sleep state, and switches the hall sensor bias
circuit to ground when THMC45 is in run state.
When trying to minimize current draw in battery operated devices such as notebook PC’s, every
milliampere counts; therefore, the bias current of the hall effect sensor must be eliminated during sleep
state. Without the HBIAS function, the notebook PC manufacturer would have to use an external FET to
switch the fan off when its operation is not needed. The sleep state function and the HBIAS output switch
eliminates the need for this external FET, thus adding value to the fan.
This output will sink current when the THMC45 is in run state, and float when the THMC45 is in sleep
state. Figure 1 shows the typical application for HBIAS
Supply Voltage Input (VPWR)
This pin serves as the voltage supply pin to the THMC45. A 0.1F bypass capacitor should be placed
as close to this pin as layout permits. Additional bulk capacitance of 2.2F to 10F on this pin is highly
recommended in order to reduce current spikes on the supply line during motor commutation, thus
reducing radiated emissions from the fan.
PWM Input
OUTA, OUTB, H
BIAS
Enable Signal
t
sleep
t
sleep
t
pwm_de-glitch
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