FAN8725 Fairchild Semiconductor, FAN8725 Datasheet - Page 11

• 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

Application Information
1. TORQUE CONTROL & OUTPUT CURRENT CONTROL
1) By amplifying the voltage difference between Ec and Ecr from Servo IC, the Torque Sense AMP produces the input volt-
2) The output current (I
3) The signals, E
4) The range of the torque voltage is as shown below.
Current
[mA]
700
age(V
By the negative feedback loop, the sensed output voltage, VCS is equal to the input V
early controlled by the input V
6
The input range of E
AMP
-1.0 V
) for the Current Sense AMP.
Ecr
Reverse
C
and E
Torque AMP
+
-50mV
Ec
-
O
CR
) is converted into the voltage (V
Ecoff-
can control the velocity of the Motor by controlling the output current (I
CR,
AMP
0
Ecoff+
E
C
.
is 0.2 V ~ 4.0 V ( R
50mV
ECR-EC
Forward
V
AMP
+
-
1.0 V
V
M
+
CS
-
CS
11
) through the sense resistor (R
Current Sense AMP
E
= 0.5[ ] )
CR
-E
C
TSD
E
E
CR
CR
Controller
> Ec
< Ec
Gain
AMP
CS
Vcs
) and compared with the V
. The output current (I
Driver
Rotation
Forward rotation
Stop after detecting re-
verse rotation
+
V
-
M
Io
Rcs
O
) of the Driver.
M
FAN8725 (KA3025)
O
) is lin-
AMP
.