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FAN8025G3
Features
* * * * * * 2-Channel BTL drivers with current feedback 2-Channel BTL DC motor drivers 1-Channel Logic input loading driver Built-in thermal shutdown circuit Built-in mute circuit Operating supply voltage: 4.5~13.2V
Typical Applications
* * * * Compact disk ROM (CD-ROM) Digital video disk player (DVDP) Video compact disk player(VCDP) Other compact disk media
(c)2003 Fairchild Semiconductor Corporation
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Description
The FAN8025G3 is a monolithic IC, suitable for 2-ch BTL DC motor drivers, 2-ch motor drivers with current feedback which drive the focus and the tracking actuator and 1-ch logic input loading driver. 28-SSOPH-375SG2
Ordering Information
Device FAN8025G3 FAN8025G3X Package 28-SSOPH375SG2 28-SSOPH375SG2 Operating Temp. -35 C ~ 85 C -35 C ~ 85 C
X:Tape & Reel type
Rev. 1.0.0
2
28 1 2 3 4 5 6 7 8 9 10 CTL FWD REV DO1+ DO1- 11 12 13 14 IN4 27 26 25 24 23 22 IN5 CAP5.1 CAP5.2 FB5 FB4 CAP4.1 CAP4.2 DO5- DO5+ DO4- DO4+ VCC2 MUTE REF
FAN8025G3
Pin Assignments
(GND) FIN
FAN8025G3
FIN (GND)
SGND
21 20 19 18 17 16 15
IN2 IN3 VCC1 DO3+ DO3- DO2+ DO2-
FAN8025G3
Pin Definitions
Pin 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 IN5 CAP5.1 CAP5.2 FB5 FB4 CAP4.1 CAP4.2 SGND IN4 CTL FWD REV DO1+ DO1- DO2- DO2+ DO3- DO3+ VCC1 IN3 IN2 REF MUTE VCC2 DO4+ DO4- DO5+ DO5- I/O A A A A A A A P A A I I O O O O O O P A A A I P O O O O CH5 input Connection with capacitor for CH5 Feedback for CH5 Feedback for CH4 Connection with capacitor for CH4 Signal ground CH4 input CH1 speed control input CH1 forward input CH1 reverse input Drive1 Output (+) Drive1 Output (-) Drive2 Output (-) Drive2 Output (+) Drive3 Output (-) Drive3 Output (+) Power for channel 1,2 and 3 CH3 input CH2 input Bias voltage input CH2,3,4 and 5 mute signal input Power for channel 4and 5 Drive4 Output (+) Drive4 Output (-) Drive5 Output (+) Drive5 Output (-) Pin Function Description
3
FAN8025G3
Internal Block Diagram
VCC1 VCC1
10k
IN4
9
20k
VCC1
24 VCC2
25
DO4+
Level shift
7.5k 7.5k
CAP4.1 6 CAP4.2 7
VCC1
26
DO4-
X2
VCC1
5
FB4
10k
IN5
1
20k 7.5k
VCC1 27
DO5+
Level shift
7.5k
CAP5.1 CAP5.2
2 3
28
DO5-
X2
4 FIN
FB5
FIN
TSD
VCC1
SGND
8
19
VCC1 DO3+
IN3
10k
20
20k
Level shift
18
17
DO3-
VCC1
IN2
21
10k
20k
Level shift
16
DO2+
15
DO2-
CTL FWD REV MUTE REF
10
Speed control
11 12 23 22
13
DO1+
Logic
Level shift
14
DO2-
4
FAN8025G3
Equivalent Circuits
CH2/3/4/5 Inputs
VCC1
VCC1
Current Feedback Amp Outputs
VCC1
VCC1 1 9 20 21
Ref
1K
1K
7 3
50
10K
10K 50
10K
Current Feedback Amp Compensation Inputs
VCC1
VCC1 7.5K
2 6
7.5K
Current Feedback Inputs
VCC1 10K VCC1 10K 20K
4 5
Drive output -
20K
5
FAN8025G3
Equivalent Circuits(continued)
CH1 Inputs(FWD/REV)
VCC1
CH1 Control Input(CTL)
VCC1
11 12 30K
VCC1 40K 10K
10
30K
35K
Mute Input
Ref Input
VCC1 40K 23 40K
100K
VCC1 1K 22 1K 1K 1K 1K
CH1/2/3 Drive Outputs
VCC1
CH4/5 Drive Outputs
VCC1 VCC2
13 30K 14 15 16 17 18 20K
30K
25 26 27 28
20K
6
FAN8025G3
Absolute Maximum Ratings (Ta = 25C)
Parameter Symbol Value Unit
Maximum supply voltage Power dissipation Operating temperature range Storage temperature range
VCC1,2max PD TOPR TSTG
15 2.5
note
V W
C C
-35 ~ +85 -55 ~ +150
NOTE: 1. When mounted on a 50mm x 50mm x 1mm PCB (Phenolic resin material). 2. This is experimental data. 3. Power dissipation decrease rate : -20mW/C(Ta25C). 4. Should not exceed P D 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 Symbol Min. Typ. Max. Unit
Supply Voltage
VCC1,2
4.5
-
13.2
V
7
FAN8025G3
Electrical Characteristics
(Unless otherwise specified, Ta = 25 C, VCC1 = 12V, VCC2 = 5V & the other conditions & nomenclatures follow the test circuit)
Parameter Symbol Conditions Min. Typ. Max. Unit
Quiescent Current1 Quiescent Current1 Mute On Voltage Mute Off Voltage REF input voltage range REF input current range*
ACTUATOR DRIVER(CH4,CH5)
ICC1 ICC2 VMON VMOFF VREFIN IREFIN IOO45 VOM45 GM45 VIN45 VOF23 VOM23 GVLO23 VIN23 VIH VIL VOF1 GV
Stand-by off Stand-by on VREF=1.65V VIN = 100mVp-p, f=1kHz VIN = 100mVp-p, f=1kHz -
2.0 1.0 -10 -6 3.6 1.2 0 -100 9.5 16 0 2 -50 1.0
18 9 0 4.0 1.4 0 10.0 18.0 0 1.2
27 0.5 3.3 10 +6 1.6 5 +100 20 5 0.5 50 1.4
mA mA V V V uA mA V A/V V mV V dB V V V mV V/V
Output Offset Current45 Maximum Output Voltage45 Transconductance Control voltage input range45* Output Offset Voltage23 Maximum Output Voltage23 Closed loop Voltage Gain23 Control voltage input range23*
LOADING DRIVER(CH1)
SLED/SPINDLE DRIVER(CH2,CH3)
Input high level Voltage Input low level Voltage Output Offset Voltage1 Transfer Gain * : Guaranteed design values
8
FAN8025G3
Application Information
1. Reference Input
* Reference input (PIN 22) The applied voltage at the reference input pin must be ranged between 1.0V and 3.3V, when V CC1=12V. When the reference input voltage goes below 0.7V, all channels are disabled.
2. Stand-by Function
* MUTE input (PIN 23) We recommend CH1 as the loading(or tray) motor driver. Detailed logic table is as below.
INPUT LOGIC Stand-by input High Low or open
CH1 O O
CH2 O X
CH3 O X
CH4 O X
CH5 O X
3. Protection Function
Thermal shutdown (TSD) When the chip temperature rises above 175C, the thermal shutdown (TSD) circuit is activated and the output circuit is in the mute state, that is off state. The TSD circuit has a temperature hysteresis of 25C
4. Separation Of Power Supply
* VCC2 (PIN 24) VCC2 is the power supply for CH4 and CH5, which are current feedback drivers. * VCC1 (PIN 19) VCC1 is the power supply for CH1, CH2, CH3 and predriver. VCC1 input voltage must be higher than or same to VCC2. (VCC1VCC2)
9
FAN8025G3
4. Current feedback channels(channel 4 & 5)
20k Command 10k
current amp
power amp actuator
Level shift
7.5k ref 7.5k
Sensing resistor
X2
Rext
Cext
* The reference voltage(ref) is given externally through pin 22. * 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 & 3 schematic
power amp 20k Command 10k
Level shift
M
ref
* The reference voltage(ref) is given externally through pin 22. * The input OP-amp output signal is amplified by (12K/10K) times and then fed to the power amplifier. The gain of power amplifier is 4 so the total max gain of channel 2 and 3 is 8.
10
FAN8025G3
6. Channel 1 schematic
CTL
10 Vpref
DO1+
13
FWD REV
11
Speed control
Logic
Level shift
DO114
M
12
Vpref
* The inputs of channel 1 are FWD, REV which are logic inputs and CTL which is linear input. The CTL input is used to control the output gain, meanwhile FWD and REV are logic inputs to select output driver's direction. * Below table is FWD and REV logic input table.
Input FWD H H L L REV H L H L DO1+ Vpref H L Vpref
Output DO1Vpref L H Vpref condition Brake Forward Reverse Brake
11
FAN8025G3
Typical Application Circuits
1 SERVO FOCUS IC SPINDLE SLED SPIN COMMAND SLED COMMAND 4
IN1
DO5- 28 DO5+ 27
RCS
FOCUS ACTUATOR
2 CAP5.1 3 CAP5.2 FB5
DO4- 26 RCS DO4+ 25 VCC2 24 5V
TRACKING ACTUATOR
5 TRACKING
FB4
6 CAP4.1 LOADING 7 CAP4.2
MUTE 23
MUTE REF
REF
22
PGND
FAN8025G3
PGND SPIN COMMAND
8
SGND IN4
IN2 IN3
21 SLED COMMAND
9
20
10
CTL FWD
VCC1 19 12V DO3+ 18 SLED MOTOR DO3- 17 DO2+ 16 SPINDLE MOTOR DO2- 15
11 12
REV DO1+ DO1-
13 LOADING MOTOR 14
12
FAN8025G3
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.
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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.
10/1/03 0.0m 001 Stock#DSxxxxxxxx 2003 Fairchild Semiconductor Corporation

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