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PDF FAN8725 Data sheet ( Hoja de datos )
| Número de pieza | FAN8725 | |
| Descripción | Spindle Motor and 5-Channel Motor Driver | |
| Fabricantes | Fairchild Semiconductor | |
| Logotipo |  |
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FAN8725 (KA3025)
Spindle Motor and 5-Channel Motor Driver
Features
Common
• Built-in thermal shutdown circuit (TSD)
• Built-in power save circuit
• 3 Independent voltage source
• Corresponds to 3.3V or 5V DSP
Spindle
• Built-in hall bias
• Built-in FG signal output circuit
• Built-in rotational direction detecting circuit
• Built-in protection circuit for reverse rotation
• Built-in short brake circuit
BTL (5-channel)
• Built-in 5-CH balanced transformerless (BTL) driver
• Built-in Level shift circuit
• Independent voltage sources
• VM2 = CH1,CH2 / VM3 = CH3, CH4 ,CH5
Description
The FAN8725 is a monolithic IC suitable for a 3-phase
BLDC spindle motor driver and 5-ch motor drivers which
drives the focus actuator, tracking actuator, loading motor,
stepping motor driver of the CD-media systems.
48-QFPH-1414
Typical Applications
• Compact disk ROM (CD-ROM)
• Compact disk RW (CD-RW)
• Digital video disk ROM (DVD-ROM)
• Digital video disk RAM (DVD-RAM)
• Digital video disk Player (DVDP)
• Other compact disk media
Ordering Information
Device
Package
FAN8725 48-QFPH-1414
Operating Temp.
−35°C ~ +85°C
©2000 Fairchild Semiconductor International
1
Rev. 1.0.1
March. 2000.
1 page  
Internal Block Diagram
FAN8725 (KA3025)
H1+ 1
48 47 46 45 44 43
Hall
Bias
H1 - 2
H2+ 3
H2 - 4
H3+ 5
Absolute Values
Current
Sense Amp
Output
Current Limit
H3 - 6
FIN(GND)
Detection
Logic
FG 7
DIR 8
SVCC1 9
VM1 10
Reverse
Rotation
Short
Brake
Distributor
CS1 11
PGND1 12
Driver
13 14 15 16 17 18
42 41 40 39 38 37
R
VM3
R
VM3
R
VM2
R
VM2
CH5
X8
36 DO5 -
35 DO5+
CH4
X8
34 DO4 -
33 DO4+
CH3
X8
32 DO3 -
31 DO3+
VM3
FIN(GND)
CH2
X5
CH1
X5
VM2
30 PGND2
29 DO2 -
28 DO2+
27 DO1 -
26 DO1+
25 OUT1
19 20 21 22 23 24
5
5 Page 
Application Information
1. TORQUE CONTROL & OUTPUT CURRENT CONTROL
FAN8725 (KA3025)
Torque AMP
Ecr +
-
Ec
VM
+
VAMP
-
ECR-EC
Current Sense AMP
-
+
TSD
Gain
Controller
VM
+
Vcs
-
Rcs
Io
Driver
M
1) By amplifying the voltage difference between Ec and Ecr from Servo IC, the Torque Sense AMP produces the input volt-
age(VAMP) for the Current Sense AMP.
2) The output current (IO) is converted into the voltage (VCS) through the sense resistor (RCS) and compared with the VAMP.
By the negative feedback loop, the sensed output voltage, VCS is equal to the input VAMP. The output current (IO) is lin-
early controlled by the input VAMP.
3) The signals, EC and ECR can control the velocity of the Motor by controlling the output current (IO) of the Driver.
4) The range of the torque voltage is as shown below.
Current
[mA]
700
Reverse
Forward
Ecoff- Ecoff+
ECR > Ec
ECR < Ec
6
-1.0 V -50mV 0
50mV
1.0 V
ECR -EC
The input range of ECR, EC is 0.2 V ~ 4.0 V ( RCS = 0.5[Ω] )
Rotation
Forward rotation
Stop after detecting re-
verse rotation
11
11 Page | ||
| Páginas | Total 20 Páginas | |
| PDF Descargar | [ Datasheet FAN8725.PDF ] | |
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