FAN8423D3TF Fairchild Semiconductor, FAN8423D3TF Datasheet - Page 11

• Manufacturer Part Number: FAN8423D3TF
• Description: Motor / Motion / Ignition Controllers & Drivers BLDC Motor Driver 3Phase 5V Interface
• Manufacturer: Fairchild Semiconductor
• Type: 3 Phase BLDC Motor Driverr

Specifications of FAN8423D3TF

• Operating Temperature Classification: Commercial
• Package Type: SSOP
• Operating Supply Voltage (min): 4.5V
• Operating Supply Voltage (typ): 5V
• Operating Supply Voltage (max): 5.5V
• Operating Supply Voltage: 5 V
• Mounting Style: SMD/SMT
• Package / Case: SSOP-28
• Lead Free Status / Rohs Status: Compliant

Therefore, the output of the rotational direction detector is Low, when the spindle rotates forward, while HIGH as in the case
of the reverse rotation.
6. Reverse Rotation Prevention
1) When the output of the OR Gate, A is LOW, it steers all the output current of the current sense Amp to the Gain Controller
2) As in the state of the forward rotation, the D-F/F output, Q is HIGH and the motor rotates normally. At this state, if the
zero. The output current of the Driver becomes zero and the motor stops.
control input is changed such that EC>ECR, then the motor rotates slowly by the reverse commutation in the Driver. When
the motor rotates in reverse direction, the D-F/F output becomes Low and the OR Gate output, becomes LOW. This pre-
vents the motor from rotating in reverse direction. The operation principle is shown in the table and the flow chart.
ECR
H2+
H3+
H2-
H3-
EC
Rotation
Forward
Reverse
+
+
+
-
-
-
H1
H2
H3
H2
H
L
CK
D
D-F/F
Q
H L
H L
H3
A
Oct. 2000.
Rev. 1.0.1
Low Active
D-F/F
(Q)
H
L
Controller
Current
Sense
Amp
Gain
E
Forward
Reverse Rotation Preventer
C
<E
-
CR
(b) Forward rotation
Driver
Brake and Stop
E
C
>E
-
FAN8423D3
CR
M
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