參數(shù)資料
型號(hào)： SZA1015TT
元件分類： TVS-瞬態(tài)抑制二極管
英文描述： Transient Voltage Suppressor Diodes
中文描述： 電機(jī)控制器
文件頁(yè)數(shù)： 9/20頁(yè)
文件大?。?/td> 97K
代理商： SZA1015TT
2001 Jul 11
9
Philips Semiconductors
Product specification
Brushless Motor Controller (BMC12)
SZA1015
handbook, full pagewidth
MGT196
12 V
(1)
(3)
(4)
(2)
UP-UN
WP-WN
VP-VN
0 V
U
12 V
0 V
V
12 V
0 V
W
Fig.8 Phase condition of Hall input and output voltage (motor running with E
C
> E
CR
).
(1) In this example, a PWM output signal with a 25% duty cycle is drawn as a thin line. The average motor voltage (drawn with a thicker line width) is
25%
×
V
, i.e. 3.0 V. At the opposite side of the coil (in this drawing pin W) the duty cycle is 75%, so the average voltage on pin W is 9.0 V. The
differential voltage over the motor pins then is: 9
3 = 6 V.
(2) There is still a current flowing from pin U into the motor. The lower flyback diode starts conducting, and causes a flyback voltage of around 0.7 V
below GND, until the current is zero.
(3) There is still a current flowing from the motor into pin U. The upper flyback diode starts conducting, and causes a flyback voltage of around 0.7 V
above V
DDM
, until the current is zero.
(4) During this phase, the driver output is 3-state. Because there is no current flowing through pin U, the back-EMF of the motor is seen.
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