FAN8725 Fairchild Semiconductor, FAN8725 Datasheet - Page 14

• Manufacturer Part Number: FAN8725
• Description: Motor / Motion / Ignition Controllers & Drivers BTL Motor Drive IC 3Phase BLDCM+5CH
• Manufacturer: Fairchild Semiconductor
• Type: Spindle Motorr

Specifications of FAN8725

• Operating Temperature Classification: Commercial
• Package Type: QFPH
• Operating Supply Voltage (min): 4.5V
• Operating Supply Voltage (max): 13.2V
• Operating Supply Voltage: 15 V
• Supply Current: 0.6 A
• Mounting Style: SMD/SMT
• Package / Case: QFPH-48
• Operating Temperature: - 35 C to + 85 C
• Lead Free Status / RoHS Status: Compliant

FAN8725 (KA3025)
On the other hand, if the spindle rotates in forward rotation, the phase relationship is H3->H2->H1 as shown in Fig.(b)
The direction output ,detector is Low, when the spindle rotates forward, and HIGH in the reverse direction.
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
+
+
+
-
-
-
H1
H2
H3
D
CK
D-F/F
Q
A
Low Active
14
Controller
Current
Sense
Amp
Gain
(b) Forward rotation
Driver
M