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FAN8024CD
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
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
(c)2003 Fairchild Semiconductor Corporation
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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
Ordering Information
Device FAN8024CD Package 28-SSOPH-375 Operating Temp. -25 C ~ 85 C -25 C ~ 85 C
FAN8024CDTF 28-SSOPH-375
Rev. 1.0.0
2
28 1 2 3 4 5 6 7 8 9 10 PGND1 DO2- DO2+ DO1- DO1+ 11 12 13 14 PVCC1 27 26 25 24 23 22 IN1 CAP1.1 CAP1.2 IN2.1 IN2.2 OUT2 FB1 STBY REF IN4 CAP4.1 CAP4.2 IN3 VCCGND
FAN8024CD
Pin Assignments
(GND) FIN
FAN8024CD
FIN (GND)
VCC
21 20 19 18 17 16 15
PVCC2 FB4 PGND2 DO3- DO3+ DO4- DO4+
FAN8024CD
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 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 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 Pin Function Description
3
FAN8024CD
Internal Block Diagram
VCCGND PGND2 CAP4.1 CAP4.2 PVCC2
DO3-
DO4-
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 PVCC1 PVCC2
+
20K
10K
7.5K
+
10K
1 IN1
2 CAP1.1
3 CAP1.2
4 IN2.1
DO1-
DO2-
GND
4
PVCC1
PGND1
OUT2
DO2+
IN2.2
DO1+
FB1
VCC
-
+
5
-
-
+
Loading Driver
Actuator Driver
+
VCC 7.5K X2
25K
Sled Driver
Actuator Driver
VCC PVCC1
6
7
8
9
10
11
12
13
14
DO4+
STBY
REF
-
-
-
+
-
FAN8024CD
Equivalent Circuits
ERROR AMP INPUT STAND-BY INPUT
70 2K 4 1K 2K 1K 2K 2K 30 5 28 40
30
ERROR AMP OUTPUT
SIGNAL REFERENCE INPUT
2 6 27 50
POWER AMP OUTPUT
11 12 13 14 15 16 17 18
5
FAN8024CD
Absolute Maximum Ratings (Ta = 25C)
Parameter Maximum supply voltage Power dissipation Operating temperature range Storage temperature range Symbol VCCmax PD TOPR TSTG Value 15 1.7
note
Unit V W C C
-25 ~ +85 -55 ~ +150
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. Should not exeed 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
FAN8024CD
Electrical Characteristics
(Unless otherwise specified, Ta = 25 C, VCC = 12V, PVCC1,2 = 5V) Parameter Quiescent Current1 Quiescent Current1 Stand-by On Voltage Stand-by Off Voltage ACTUATOR DRIVE CIRCUIT Output Offset Current Maximum Output Voltage1 Transconductance 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 SLED DRIVE CIRCUIT Output Offset voltage2 Maximum Output Voltage2 Closed loop Voltage Gain1 Loading DRIVE CIRCUIT Output Offset Voltage1 Maximum Output Voltage 3 Closed loop Voltage Gain 2 * : 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 VOF2 VOM2 GVLO2 VIN = 100mVp-p, f=1kHz -100 10.0 18.0 0 10.9 20.0 +100 22.0 mV V dB VOOM IB VOL VOH ISOURCE ISINK 0 -300 10 1 5 -30 0.1 10.9 4 10 11.0 0.3 V nA V V mA mA IOO1,4 VOM1,4 GM1,4 VIN = 100mVp-p, f=1kHz -6 3.6 1.5 0 4.0 1.7 +6 1.9 mA V A/V Symbol ICC1 ICC2 VSTon VSToff Conditions Stand-by off Stand-by on Min. 2.0 Typ. 18 Max. 27 0.5 0.5 Unit mA mA V V
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 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, that is off state. The TSD circuit has a temperature hysteresis of 25C
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. VCCPV CC1(PVCC2).
8
FAN8024CD
4. Current feedback channels(channel 1 & 4)
20k Command 10k
current feedback 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 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 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.
9
FAN8024CD
6. Channel 3 schematic
power amp 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 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
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
FAN8024CD
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
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.
www.fairchildsemi.com 8/11/03 0.0m 001 Stock#DSxxxxxxxx 2003 Fairchild Semiconductor Corporation
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.

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