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參數(shù)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(shù)： | 14/14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 !
9
THMC45
SINGLE-PHASE 5VDC BRUSHLESS FAN DRIVER WITH SINGLE WIRE CONTROL INTERFACE
Product Preview
H-Bridge Outputs (OUTA, OUTB)
The THMC45 PWM controlled H-bridge topology driving a bipolar-wound single-phase brushless motor
provides several advantages for small, 5V brushless DC fans over the unipolar-wound motor driven by
two commutated low-side switches typically used. The H-bridge topology requires only two IC drive
pins and the bipolar-wound motor also needs only two drive connections, reducing the number of traces
on the fan PCB. A bipolar wound stator has a single-wire winding which is simpler to manufacture, and
thus increases reliability and reduces manufacturing time.
All factors combine to allow a smaller
diameter fan center hub, and thus higher blade area / airflow for a given fan frame size. Generally, an
H-bridge drive method with bipolar wound stator increases fan motor torque density over the typical
unipolar drive method. The H-bridge drive method also eliminates the need for snubbing inductive
energy at commutation transitions.
Figures 2a and 2b show the THMC45 H-Bridge motor drive states with stator winding current being
driven from OUTA to OUTB and from OUTB to OUTA, respectively. As shown, the motor winding is
pulse-width-modulated (PWM’d) from the low-side, with inductive current re-circulating on the high-side
during tOFF. Re-circulation of current through the high-side switches during tOFF, known as synchronous
rectification, improves power conversion efficiency by maintaining the inductive energy in the stator
winding.
Figure 2a: H-Bridge PWM Drive with Synchronous Rectification
Figure 2b: H-Bridge PWM Drive with Synchronous Rectification
A to B Current Direction
I
RECIRCULATE
Motor
OUTA
VPWR
GND
PWM
OFF
ON
I
DRIVE
PWM
OUTB
Motor
OUTA
VPWR
GND
PWM
OFF
ON
PWM
OUTB
PWM
t
ON
PWM
t
OFF
OUTA
H
H+
H
H-
L
OUTB
PWM
B to A Current Direction
I
RECIRCULATE
OUTA
VPWR
GND
I
DRIVE
OUTB
OUTA
VPWR
OUTB
PWM
t
ON
PWM
t
OFF
PWM
OFF
ON
PWM
Motor
GND
PWM
OFF
ON
PWM
Motor
OUTA
H
H+
L
H-
H
OUTB
PWM
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