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參數(shù)資料
| 型號： | THMC45DGNR |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 運(yùn)動控制電子 |
| 英文描述： | BRUSHLESS DC MOTOR CONTROLLER, PDSO8 |
| 封裝： | PLASTIC, MSOP-8 |
| 文件頁數(shù)： | 13/15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
7
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
PRINCIPLES OF OPERATION
H-bridge motor drive outputs (OUTA, OUTB) (continued)
Figures 2a and 2b show THMC45 H-bridge motor drive states with stator winding current being driven from
OUTA to OUTB and from OUTB to OUTA, respectively, based on the Hall sensor commutation state. As shown
during tON, PWM signal is high and the drive current is from VPWR through the activated switches and motor
to GND. PWM occurs on the low side, and the stator winding inductive current recirculates on the high side
during tOFF and PWM signal is low (see Figure 3 for motor current waveform). Recirculation of inductive current
through the high-side switches during tOFF, known as synchronous rectification, improves power conversion
efficiency by maintaining energy in the stator winding and results in a continuous dc current level.
Motor
OUTA
GND
PWM
OFF
ON
OUTB
OUTA
H
H+
H
L
OUTB
PWM
M1
M2
M3
M4
M1
M2
PWM
PWM tON
I(DRIVE)
Motor
OUTA
GND
PWM
OFF
ON
OUTB
M3
M4
PWM
I(RECIRCULATE)
PWM tOFF
a) A to B Current Direction
VPWR
Motor
OUTA
GND
PWM
OFF
ON
OUTB
OUTA
PWM
H+
L
H
OUTB
H
M1
M2
M3
M4
M1
M2
PWM tON
I(DRIVE)
Motor
OUTA
GND
PWM
OFF
ON
OUTB
M3
M4
PWM
I(RECIRCULATE)
PWM tOFF
PWM
b) B to A Current Direction
VPWR
Figure 2. H-Bridge PWM Drive With Synchronous Rectification
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