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FAN8024ED 4-Channel Motor Driver
September 2005
4-Channel Motor Driver
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
FAN8024ED
Description
The FAN8024ED 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 FAN8024ED FAN8024EDTF 28-SSOPH-375 28-SSOPH-375
Ordering Information
Device Package Operating Temp.
-25 C ~ 85 C -25 C ~ 85 C
TF: Tape & Reel type
(c)2005 Fairchild Semiconductor Corporation
1
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FAN8024ED Rev. 1.0.0
FAN8024ED 4-Channel Motor Driver
Block Diagrams
VCCGND
PGND2
CAP4.1
CAP4.2
PVCC2
DO4-
DO3-
DO3+
28
27
26
10K
25
7.5K
24
23
22
21
PVCC2
20
FB4
IN4
IN3
GND
19
18
17
16
15
20K
+
7.5K X2
10K
15K
+
TSD
Loading Driver
PVCC1 PVCC2
Actuator Driver
+
+
VCC 7.5K X2 10K 7.5K
-
20K
+
25K
Sled Driver
Actuator Driver
10K
1 IN1
2 CAP1.1
3 CAP1.2
4 IN2.1
DO1-
DO2-
GND
2 FAN8024ED Rev. 1.0.0
PVCC1
PGND1
OUT2
DO2+
IN2.2
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DO1+
FB1
VCC
-
+
VCC PVCC1
5
6
7
8
9
10
11
12
13
14
DO4+
STBY
REF
-
-
-
-
+
-
FAN8024ED 4-Channel Motor Driver
Pin Assignments
IN1 1 CAP1.1 2
28 STBY 27 REF 26 IN4 25 CAP4.1 24 CAP4.2 23 IN3 22 VCCGND
CAP1.2 3 IN2.1 4 IN2.2 5 OUT2 6 FB1 7
FIN(GND)
VCC 8 PVCC1 9 PGND1 10 DO2- 11 DO2+ 12 DO1- 13 DO1+ 14
FAN8024ED
FIN(GND)
21 PVCC2 20 FB4 19 PGND2 18 DO3- 17 DO3+ 16 DO4- 15 DO4+
3 FAN8024ED Rev. 1.0.0
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FAN8024ED 4-Channel Motor Driver
Pin Definitions
Pine Number
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28
Pin Name
IN1 CAP1.1 CAP1.2 IN2.1 IN2.2 OUT2 FB1 VCC PVCC1 PGND1 DO2- DO2+ DO1- DO1+ DO4+ DO4- DO3+ DO3- PGND2 FB4 PVCC2 VCCGND IN3 CAP4.2 CAP4.1 IN4 REF STBY
I/O
I I I O I O O O O O O O O I I I I CH1 input
Pin Function Description
Connection with capacitor for CH1 OP-AMP CH2 input(+) OP-AMP CH2 input(-) OP-AMP CH2 output Feedback for CH1 Signal Vcc Power Supply 1 Power Ground 1 Drive2 Output (-) Drive2 Output (+) Drive1 Output (-) Drive1 Output (+) Drive4 Output (+) Drive4 Output (-) Drive3 Output (+) Drive3 Output (-) Power Ground 2 Feedback for CH4 Power Supply 2 Vcc ground CH3 input Connection with capacitor for CH4 CH4 input Bias voltage input Stand-by input
4 FAN8024ED Rev. 1.0.0
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FAN8024ED 4-Channel Motor Driver
Equivalent Circuits
ERROR AMP INPUT STAND-BY INPUT
70 2K 4 1K 2K 1K 2K 2K 5 28 40
30
30
Figure 1. Error Amp Input ERROR AMP OUTPUT
Figure 4. Stand-By Input
SIGNAL REFERENCE INPUT
2 6 27 50
Figure 2. Error Amp Output POWER AMP OUTPUT
Figure 5. Signal Reference Input
11 12 13 14 15 16 17 18
Figure 3. Power Amp Output
5 FAN8024ED Rev. 1.0.0
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FAN8024ED 4-Channel Motor Driver
Absolute Maximum Ratings (Ta = 25C)
Parameter
Maximum supply voltage Power dissipation Operating temperature range Storage temperature range
Symbol
VCCmax PD TOPR TSTG
Value
15 1.7note -25 ~ +85 -55 ~ +150
Unit
V W C C
Note:
1. When mounted on a 50mm x 50mm x 1mm PCB (Phenolic Resin Material). 2. Power dissipation derating rate: -13.6mW/C (Ta25C). 3. Must not exceed Pd (Power dissipation) and SOA (Safe operating area).
Power Dissipation Curve
Pd [mW] 3,000
2,000
1,000 0 0
SOA
25 50 75 85 100 125 150 175 Ambient Temperature, Ta [C]
Recommended Operating Conditions (Ta = 25C)
Parameter
Supply Voltage Supply Voltage
Symbol
VCC PVCC1,PVCC2
Min.
4.5 -
Typ.
VCC
Max.
13.2 -
Unit
V V
6 FAN8024ED Rev. 1.0.0
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FAN8024ED 4-Channel Motor Driver
Electrical Characteristics
(Unless otherwise specified, Ta = 25 C, VCC = 12V, PVCC1,2 = 5V)
Parameter
Quiescent Current1 Quiescent Current2 Stand-by On Voltage Stand-by Off Voltage
Symbol
ICC1 ICC2 VSTon VSToff
Conditions
Stand-by off Stand-by on
Min.
-
Typ.
18 -
Max.
27 0.5 0.5 -
Unit
mA mA V V
VIN = 100mVp-p, f=1kHz
2.0
ACTUATOR DRIVE CIRCUIT
Output Offset Current Maximum Output Voltage1 Transconductance IOO1,4 VOM1,4 GM1,4 -6 3.6 1.5 0 4.0 1.7 +6 1.9 mA V A/V
PRE OP AMP (SLED DRIVER)
Common mode Input Range* Input Bias Current Low Level Output Voltage High Level Output Voltage Output Source Current Output Sink Current VOOM IB VOL VOH ISOURCE ISINK
VIN = 100mVp-p, f=1kHz
0 -300 10 1 5
-30 0.1 10.9 4 10
11.0 0.3 -
V nA V V mA mA
SLED DRIVE CIRCUIT
Output Offset voltage2 Maximum Output Voltage2 Closed loop Voltage Gain2 VOF2 VOM2 GVLO2 -100 10.0 18.0 0 10.9 20.0 +100 22.0 mV V dB
Loading DRIVE CIRCUIT
Output Offset Voltage3 Maximum Output Voltage 3 Closed loop Voltage Gain 3 *: Guaranteed design value VOF3 VOM3 GVLO3
VIN = 100mVp-p, f=1kHz
-50 3.6 13.5
0 4.0 15.5
50 17.5
mV V dB
7 FAN8024ED Rev. 1.0.0
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FAN8024ED 4-Channel Motor Driver
Application Information
1. Reference Input & and Stand-by Function
* Reference input (PIN 27) The applied voltage at the reference input pin must be 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.
Stand-by input voltage
Below 0.5V or open Above 2.0V
OPERATION
The stand-by function is activated so the bias block and power block are disabled Recover the normal operation
2. Protection Function
Thermal shutdown (TSD) If the chip temperature rises above 175C, the thermal shutdown (TSD) circuit is activated and the output circuit enters the mute state, which is off state. The TSD circuit has a temperature hysteresis of 25C.
3. Separation of Power Supply
* PVCC1 (PIN 9) PVCC1 is the power supply for the loading driver. The range is between 5V~12V. * PVCC2 (PIN 21) PVCC2 is the power supply for the actuator drivers that include focus and tracking actuators. The range is between 5V~12V * VCC (PIN 8) VCC pin supplies power for the sled driver and the signal logic part. VCCPVCC1(PVCC2).
4. Current feedback channels (channel 1 & and 4)
20k 10k Command
current feedb ack amp
poweramp actuator
Level shift
7.5k ref 7.5k
Sensing resistor
X 2
Rext
Cext
* The reference voltage(ref) is supplied 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 and then makes the controlled output to eliminate delay effect of the load. Please refer to the Application Note 4109 for additional 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, which is 1 [A/V]. Users can change the gain by adding external resistor at the command input.
8 FAN8024ED Rev. 1.0.0
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FAN8024ED 4-Channel Motor Driver
5. Channel 2 Schematic
poweramp 25k 10k
Level shift
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.
6. Channel 3 Schematic
poweramp 15k 10k Command
Level shift
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; therefore, 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.
9 FAN8024ED Rev. 1.0.0
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FAN8024ED 4-Channel Motor Driver
Typical Application Circuits
1 SERVO FOCUS AMP TRACKING SLED 2
IN1 CAP1.1 CAP1.2
STBY 28 REF 27 IN4 26 CAP4.1 25 CAP4.2 24 IN3 23
Stand by REF
3
REF
4
IN2.1
5
IN2.2 OUT2
6
TRAY CONTROL IN
7
FB1
VCCGND 22
FAN8024ED
8 12V 9 5V or 12V 10 PGND 11 DO2- SLED MOTOR 12 DO2+ DO3+ 17 PGND 19 DO3- 18 TRAY MOTOR PVCC1 FB4 20 VCC PVCC2 21 5V or 12V
FOCUS ACTUATOR
RD
13 DO1- 14 DO1+
DO4- 16 RD DO4+ 15
TRACKING ACTUATOR
10 FAN8024ED Rev. 1.0.0
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FAN8024ED 4-Channel Motor Driver
Package Dimensions
11 FAN8024ED Rev. 1.0.0
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FAN8024ED 4-Channel Motor Driver
12 FAN8024ED Rev. 1.0.0
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