參數(shù)資料
型號: KA3023D
廠商: FAIRCHILD SEMICONDUCTOR CORP
元件分類: 光電元器件
英文描述: 3-Phase BLDC Motor Driver(三相無刷直流電機(jī)驅(qū)動器)
中文描述: CD MOTOR DRIVER, PDSO28
封裝: 0.375 INCH, HSSOP-28
文件頁數(shù): 10/18頁
文件大小: 283K
代理商: KA3023D
FAN8423D (KA3023D); PRELIMINARY
10
4. TSD (THERMAL SHUTDOWN)
When the chip temperature rises up to about 175
°
C, the Q2 turns on so
that the output driver shuts down. When the chip temperature falls off to
about 150
°
C, then the Q2 turns off so that the driver is to operate nor-
mally. TSD has the temperature hysteresis of about 25
°
C.
5. ROTATIONAL DIRECTION DETECTION
1) The forward and the reverse rotations of the CD are detected by using the D-F/F and the truth table as shown above.
2) The rotational direction of the CD can be explained by the output waveform of the Hall sensors. Let the three outputs of
Hall sensors be H1, H2 and H3 respectively.
When the spindle rotates in reverse direction, the Hall sensor output waveform are shown in Fig.(a). Thus the phases are in
order H1
H2
H3 with a 120
°
phase difference.
On the other hand, if the spindle rotates in forward rotation, the phase relationship is H3
H2
H1 as shown in Fig.(b)
Gain
Controller
BIAS
Q2
20
+
-
+
-
Vcc
DIR
D-F/F
D
Q
CK
H2+
H3+
H3-
H2-
Rotation
DIR
20
Forward
Low
Reverse
High
(a) Reverse rotation
H1
H2
H3
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