FAN8024CD - uri=media.digikey

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FAN8024CD
4-Channel Motor Driver
Features
Description
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•
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•
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The FAN8024CD is a monolithic IC, suitable for 2-ch BTL
DC motor drivers and 2-ch motor drivers with current
feedback which drive the focus and tracking actuators of a
CD- media system.
2-Channel BTL driver with current feedback
2-Channel BTL DC motor driver
Built-in thermal shutdown circuit
Built-in mute circuit
Operating supply voltage: 4.5~13.2V
28-SSOPH-375
Typical Applications
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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
Operating Temp.
FAN8024CD
28-SSOPH-375
-25 °C ~ 85 °C
FAN8024CDTF 28-SSOPH-375
-25 °C ~ 85 °C
Rev. 1.0.0
©2003 Fairchild Semiconductor Corporation
2
1
2
3
4
5
6
7
IN1
CAP1.1
CAP1.2
IN2.1
IN2.2
OUT2
FB1
STBY
REF
IN4
CAP4.1
CAP4.2
IN3
VCCGND
28
27
26
25
24
23
22
FB4
PGND2
DO3−
DO3+
DO4−
DO4+
20
19
18
17
16
15
8
9
10
11
12
13
14
PGND1
DO2−
DO2+
DO1−
DO1+
FIN
(GND)
21
PVCC1
FAN8024CD
PVCC2
(GND)
FIN
VCC
FAN8024CD
Pin Assignments
FAN8024CD
Pin Definitions
Pin Number
Pin Name
I/O
Pin Function Description
1
IN1
I
CH1 input
2
CAP1.1
-
Connection with capacitor
3
CAP1.2
-
for CH1
4
IN2.1
I
OP-AMP CH2 input(+)
5
IN2.2
I
OP-AMP CH2 input(-)
6
OUT2
O
OP-AMP CH2 output
7
FB1
I
Feedback for CH1
8
VCC
-
Signal Vcc
9
PVCC1
-
Power Supply 1
10
PGND1
-
Power Ground 1
11
DO2−
O
Drive2 Output (-)
12
DO2+
O
Drive2 Output (+)
13
DO1−
O
Drive1 Output (-)
14
DO1+
O
Drive1 Output (+)
15
DO4+
O
Drive4 Output (+)
16
DO4−
O
Drive4 Output (-)
17
DO3+
O
Drive3 Output (+)
18
DO3−
O
Drive3 Output (-)
19
PGND2
-
Power Ground 2
20
FB4
-
Feedback for CH4
21
PVCC2
-
Power Supply 2
22
VCCGND
-
Vcc ground
23
IN3
I
CH3 input
24
CAP4.2
-
Connection with capacitor
25
CAP4.1
-
for CH4
26
IN4
I
CH4 input
27
REF
I
Bias voltage input
28
STBY
I
Stand-by input
3
FAN8024CD
21
20
19
18
17
16
15
7.5K
PVCC2
20K
-
+
DO4+
22
DO4−
VCCGND
23
DO3+
IN3
24
DO3−
CAP4.2
25
PGND2
CAP4.1
26
FB4
IN4
27
GND
PVCC2
REF
28
10K
STBY
Internal Block Diagram
7.5K
Actuator
Driver
Loading
Driver
+
-
-
+
15K
10K
X2
TSD
PVCC1
PVCC2
VCC
-
7.5K
+
+
20K
25K
Actuator
Driver
10K
7.5K
10K
+
-
-
+
Sled
Driver
-
X2
4
CAP1.1
CAP1.2
IN2.1
IN2.2
OUT2
FB1
GND
8
9
10
11
12
13
14
DO1+
7
DO1−
6
DO2+
5
DO2−
4
PGND1
3
PVCC1
2
VCC
1
IN1
VCC PVCC1
FAN8024CD
Equivalent Circuits
ERROR AMP INPUT
STAND-BY INPUT
70ΚΩ
2KΩ
2KΩ
30ΚΩ
4
5
1KΩ
2KΩ
1KΩ
28
40ΚΩ
2KΩ
30ΚΩ
ERROR AMP OUTPUT
SIGNAL REFERENCE INPUT
2ΚΩ
6
27
50ΚΩ
POWER AMP OUTPUT
11
12
13
14
15
16
17
18
5
FAN8024CD
Absolute Maximum Ratings (Ta = 25°C)
Parameter
Symbol
Value
Unit
Maximum supply voltage
VCCmax
15
V
Power dissipation
PD
1.7
note
W
Operating temperature range
TOPR
-25 ~ +85
°C
Storage temperature range
TSTG
-55 ~ +150
°C
NOTE:
1. When mounted on a 50mm × 50mm × 1mm PCB (Phenolic resin material).
2. Power dissipation derating rate : -13.6mW/°C(Ta≥25°C)
3. Should not exeed Pd(Power dissipation) and SOA(Safe operating area).
Power Dissipation Curve
Pd [mW]
3,000
2,000
1,000
SOA
0
0
25
50
75 85
100
125
150
175
Ambient Temperature, Ta [°C]
Recommended Operating Conditions (Ta = 25°C)
Parameter
6
Symbol
Min.
Typ.
Max.
Unit
Supply Voltage
VCC
4.5
-
13.2
V
Supply Voltage
PVCC1,PVCC2
-
VCC
-
V
FAN8024CD
Electrical Characteristics
(Unless otherwise specified, Ta = 25 °C, VCC = 12V, PVCC1,2 = 5V)
Parameter
Symbol
Conditions
Min.
Typ.
Max.
Unit
Quiescent Current1
ICC1
Stand-by off
-
18
27
mA
Quiescent Current1
ICC2
Stand-by on
-
-
0.5
mA
Stand-by On Voltage
VSTon
-
-
-
0.5
V
Stand-by Off Voltage
VSToff
-
2.0
-
-
V
Output Offset Current
IOO1,4
-
-6
0
+6
mA
Maximum Output Voltage1
VOM1,4
-
3.6
4.0
-
V
1.5
1.7
1.9
A/V
ACTUATOR DRIVE CIRCUIT
Transconductance
GM1,4
VIN = 100mVp-p, f=1kHz
PRE OP AMP (SLED DRIVER)
Common mode Input Range*
VOOM
-
0
-
11.0
V
IB
-
-300
-30
-
nA
Low Level Output Voltage
VOL
-
-
0.1
0.3
V
High Level Output Voltage
VOH
-
10
10.9
-
V
ISOURCE
-
1
4
-
mA
ISINK
-
5
10
-
mA
Output Offset voltage2
VOF2
-
-100
0
+100
mV
Maximum Output Voltage2
VOM2
-
10.0
10.9
-
V
Closed loop Voltage Gain1
GVLO2
18.0
20.0
22.0
dB
Input Bias Current
Output Source Current
Output Sink Current
SLED DRIVE CIRCUIT
VIN = 100mVp-p, f=1kHz
Loading DRIVE CIRCUIT
Output Offset Voltage1
VOF3
-
-50
0
50
mV
Maximum Output Voltage 3
VOM3
-
3.6
4.0
-
V
Closed loop Voltage Gain 2
GVLO3
13.5
15.5
17.5
dB
VIN = 100mVp-p, f=1KHz
* : Guaranteed design value
7
FAN8024CD
Application Information
1. Reference Input & Stand-by Function
• Reference input (PIN 27)
The applied voltage at the reference input pin must be ranged between 0.8V and 6.5V, when V CC=8.5V.
• Stand-by input (PIN 28)
The following input conditions must be satisfied for the stand-by function.
Stand-by input voltage
OPERATION
below 0.5V or open
The stand-by function is activated so the bias block and
power block are disabled
above 2.0V
Recover the normal operation
2. Protection Function
Thermal shutdown (TSD)
If the chip temperature rises above 175°C, the thermal shutdown (TSD) circuit is activated and the output circuit enters the
mute state, that is off state. The TSD circuit has a temperature hysteresis of 25°C
3. Separation Of Power Supply
• PV CC1 (PIN 9)
PV CC1 is the power supply for the loading driver. The range is between 5V ~ 12V.
• PV CC2 (PIN 21)
PV CC2 is the power supply for the actuator drivers that include focus and tracking actuators. The range is between 5V ~ 12V
• V CC (PIN 8)
V CC pin supplies power for the sled driver and the signal logic part. VCC≥PV CC1(PVCC2).
8
FAN8024CD
4. Current feedback channels(channel 1 & 4)
current feedback amp
20k
actuator
10k
Level shift
Command
power amp
7.5k
ref
Sensing resistor
7.5k
X2
Rext
Cext
• The reference voltage(ref) is given externally through pin 27.
• The input OP-amp output signal is amplified by (20K/10K) times and then fed to the current feedback amplifier.
• The current feedback amplifier compares the output current sensed input and command input then makes the controlled
output to eliminate delay effect of the load. Please refer to the application note for more information about current feedback
theory(http://www.fairchildsemi.com/an/AN/AN-4109.pdf).
• The DC gain of current feedback amplifier and power amplifier is unity, that is 1 [A/V]. Users can change the gain by
adding external resistor at the command input.
5. Channel 2 schematic
power amp
25k
Level shift
10k
M
ref
• The reference voltage(ref) is given externally through pin 27.
• The input OP-amp can be used for several purposes, for example low pass filter, differential input coordinator, gain scaler
and so on.
9
FAN8024CD
6. Channel 3 schematic
power amp
15k
Level shift
10k
Command
M
ref
• The reference voltage(ref) is given externally through pin 27.
• The input OP-amp output signal is amplified by (15K/10K) times and then fed to the power amplifier. The gain of power
amplifier is 4 so the total max gain of channel 3 is 6.
• Users must check input command range to use max output voltage because the total gain is relatively smaller than other
channels.
10
FAN8024CD
Typical Application Circuits
SERVO
FOCUS
AMP
TRACKING
SLED
REF
1
IN1
STBY 28
2
CAP1.1
REF 27
3
CAP1.2
IN4 26
4
IN2.1
CAP4.1 25
5
IN2.2
CAP4.2 24
6
OUT2
IN3 23
7
FB1
Stand by
REF
TRAY CONTROL IN
VCCGND 22
FAN8024CD
8
VCC
9
PVCC1
PVCC2 21
5V or 12V
12V
FB4 20
5V or 12V
10 PGND
PGND 19
11 DO2−
DO3− 18
TRAY
MOTOR
SLED
MOTOR
FOCUS
ACTUATOR
RD
12 DO2+
DO3+ 17
13 DO1−
DO4− 16
RD
14 DO1+
TRACKING
ACTUATOR
DO4+ 15
11
FAN8024CD
DISCLAIMER
FAIRCHILD SEMICONDUCTOR RESERVES THE RIGHT TO MAKE CHANGES WITHOUT FURTHER NOTICE TO ANY
PRODUCTS HEREIN TO IMPROVE RELIABILITY, FUNCTION OR DESIGN. FAIRCHILD DOES NOT ASSUME ANY
LIABILITY ARISING OUT OF THE APPLICATION OR USE OF ANY PRODUCT OR CIRCUIT DESCRIBED HEREIN; NEITHER
DOES IT CONVEY ANY LICENSE UNDER ITS PATENT RIGHTS, NOR THE RIGHTS OF OTHERS.
LIFE SUPPORT POLICY
FAIRCHILD’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES
OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT OF FAIRCHILD SEMICONDUCTOR
CORPORATION. As used herein:
1. Life support devices or systems are devices or systems
which, (a) are intended for surgical implant into the body,
or (b) support or sustain life, and (c) whose failure to
perform when properly used in accordance with
instructions for use provided in the labeling, can be
reasonably expected to result in a significant injury of the
user.
2. A critical component in any component of a life support
device or system whose failure to perform can be
reasonably expected to cause the failure of the life support
device or system, or to affect its safety or effectiveness.
www.fairchildsemi.com
8/11/03 0.0m 001
Stock#DSxxxxxxxx
 2003 Fairchild Semiconductor Corporation
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