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FAN8024CD Datasheet by onsemi
—
FAIRCHILD
—
SEM‘CDDNDLJCDTDFW
4-Channel Motor Driver
©2003 Fairchild Semiconductor Corporation
www.fairchildsemi.com
Rev. 1.0.0
Features
• 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
Description
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.
28-SSOPH-375
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 Operating Temp.
FAN8024CD 28-SSOPH-375 -25 °C ~ 85 °C
FAN8024CDTF 28-SSOPH-375 -25 °C ~ 85 °C
FAN8024CD
FAN8024CD
2
Pin Assignments
28 27 26 25 24 23 22 21 20 19 18 17 16 15
12 3 456789
10 11 12 13 14
STBY
REF
IN4
CAP4.1
CAP4.2
IN3
VCCGND
PVCC2
FB4
PGND2
DO3
−
DO3+
DO4
−
DO4+
IN1
CAP1.1
CAP1.2
IN2.1
IN2.2
OUT2
FB1
VCC
PVCC1
PGND1
DO2
−
DO2+
DO1
−
DO1+
FAN8024CD
(GND)
FIN
FIN
(GND)
FAN8024CD
3
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
if ”‘ m“?
3 E j; C
FAN8024CD
4
Internal Block Diagram
28 27 26 25 24 23 22 21 20 19 18 17 16 15
1234567 89
10 11 12 13 14
STBY
REF
IN4
CAP4.1
CAP4.2
IN3
VCCGND
PVCC2
FB4
PGND2
DO3
−
DO3+
DO4
−
DO4+
IN1
CAP1.1
CAP1.2
IN2.1
IN2.2
OUT2
FB1
VCC
PGND1
DO2
−
DO2+
DO1
−
DO1+
PVCC1
-
+
-
+
10K
20K
7.5K
X2
7.5K
Loading
Driver
Actuator
Driver
-
+
10K15K
-
+
-
+
20K
10K
7.5K
7.5K
-
+
X2
-
+
10K25K
Sled
Driver
Actuator
Driver
PVCC2
VCCPVCC1
VCC
PVCC1
PVCC2
TSD
GND
GND
OOOOOOOO
FAN8024CD
5
Equivalent Circuits
ERROR AMP INPUT STAND-BY INPUT
ERROR AMP OUTPUT SIGNAL REFERENCE INPUT
POWER AMP OUTPUT
2KΩ
2KΩ
54 1KΩ1KΩ
2KΩ2KΩ
28 40ΚΩ
30ΚΩ
30ΚΩ
70ΚΩ
627
50ΚΩ
2ΚΩ
11
12
13
14
16
17
18
15
FAN8024CD
6
Absolute Maximum Ratings (Ta = 25°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
Recommended Operating Conditions (Ta = 25°C)
Parameter Symbol Value Unit
Maximum supply voltage VCCmax 15 V
Power dissipation PD1.7note W
Operating temperature range TOPR -25 ~ +85 °C
Storage temperature range TSTG -55 ~ +150 °C
Parameter Symbol Min. Typ. Max. Unit
Supply Voltage VCC 4.5 - 13.2 V
Supply Voltage PVCC1,PVCC2 -V
CC -V
175150125100755025
0
1,000
2,000
3,000
Pd [mW]
Ambient Temperature, Ta [°C]
0
SOA
85
FAN8024CD
7
Electrical Characteristics
(Unless otherwise specified, Ta = 25 °C, VCC = 12V, PVCC1,2 = 5V)
* : Guaranteed design value
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 ---0.5V
Stand-by Off Voltage VSToff -2.0--V
ACTUATOR DRIVE CIRCUIT
Output Offset Current IOO1,4 --60+6mA
Maximum Output Voltage1 VOM1,4 -3.64.0-V
Transconductance GM1,4 VIN = 100mVp-p, f=1kHz 1.5 1.7 1.9 A/V
PRE OP
AMP (SLED DRIVER)
Common mode Input Range* VOOM -0-11.0V
Input Bias Current IB- -300 -30 - nA
Low Level Output Voltage VOL --0.10.3V
High Level Output Voltage VOH - 10 10.9 - V
Output Source Current ISOURCE -14-mA
Output Sink Current ISINK -510-mA
SLED DRIVE CIRCUIT
Output Offset voltage2 VOF2 - -100 0 +100 mV
Maximum Output Voltage2 VOM2 - 10.0 10.9 - V
Closed loop Voltage Gain1 GVLO2 VIN = 100mVp-p, f=1kHz 18.0 20.0 22.0 dB
Loading DRIVE CIRCUIT
Output Offset Voltage1 VOF3 --50050mV
Maximum Output Voltage 3 VOM3 -3.64.0-V
Closed loop Voltage Gain 2 GVLO3 VIN = 100mVp-p, f=1KHz 13.5 15.5 17.5 dB
FAN8024CD
8
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 VCC=8.5V.
• Stand-by input (PIN 28)
The following input conditions must be satisfied for the stand-by function.
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)
PVCC1 is the power supply for the loading driver. The range is between 5V ~ 12V.
•PV
CC2 (PIN 21)
PVCC2 is the power supply for the actuator drivers that include focus and tracking actuators. The range is between 5V ~ 12V
•V
CC (PIN 8)
VCC pin supplies power for the sled driver and the signal logic part. VCC≥PVCC1(PVCC2).
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
+|
QQ
I+
|_—\
FAN8024CD
9
4. Current feedback channels(channel 1 & 4)
• 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
• 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.
Level shift
X2
20k
10k
7.5k
7.5k
ref
actuator
Sensing resistor
Rext Cext
Command
power amp
current feedback amp
Level shift
25k
10k
ref
power amp
M
fl
FAN8024CD
10
6. Channel 3 schematic
• 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.
Level shift
15k
10k
ref
power amp
M
Command
FAN8024CD
11
Typical Application Circuits
28
27
26
25
24
23
22
21
20
19
18
17
16
15
1
2
3
4
5
6
7
8
9
10
11
12
13
14
FAN8024CD
SERVO
AMP FOCUS
TRACKING
SLED
TRAY
SLED
12V
FOCUS
ACTUATOR
IN1
CAP1.1
CAP1.2
IN2.1
IN2.2
OUT2
FB1
VCC
PVCC1
PGND
DO2−
DO2+
DO1−
DO1+
STBY
REF
IN4
CAP4.1
CAP4.2
IN3
VCCGND
PVCC2
FB4
PGND
DO3−
DO3+
DO4−
DO4+
TRAY CONTROL IN
MOTOR
5V or 12V
REF
REF
MOTOR
TRACKING
ACTUATOR
RD
RD
5V or 12V
Stand by
FAN8024CD
8/11/03 0.0m 001
Stock#DSxxxxxxxx
2003 Fairchild Semiconductor Corporation
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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
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.
