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参数资料
| 型号： | FAN8423DTF |
| 厂商： | FAIRCHILD SEMICONDUCTOR CORP |
| 元件分类： | 运动控制电子 |
| 英文描述： | BRUSHLESS DC MOTOR CONTROLLER, 1.3 A, PDSO28 |
| 封装： | 0.375 INCH, HEAT SINK, SSOP-28 |
| 文件页数： | 2/18页 |
| 文件大小： | 283K |
| 代理商： | FAN8423DTF |
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
Forward
Low
Reverse
High
20
(a) Reverse rotation
H1
H2
H3
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