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KA3021D
4-Channel Motor Driver
Features
* * * * * * 3-channel Balanced TransformerLess(BTL) driver 1-channel forward-reverse control DC motor driver Built-in thermal shutdown circuit Built-in mute circuit Operating supply voltage: 4.5V ~ 13.2V Corresponds to 3.3V or 5V DSP
Description
The KA3021D is a monolithic IC, suitable for a 1-ch (Forward.reverse) control DC motor driver and a 3-ch motor driver which drives the focus actuator, tracking actuator, and sled motor 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 KA3021D KA3021DTF Package 28-SSOPH-375 28-SSOPH-375 Operating Temp. -35C ~ +85C -35C ~ +85C
Rev. 1.0.2 February. 2000.
(c)2000 Fairchild Semiconductor International
1
DO1- 28 1 2 3 4 5 6 7 27 26 25 24 23 22
GND
Pin Assignments
DO1+
DO4- DO4+ IN4
IN1 IN1.1
OPIN+ OPIN-
IN4.1 REF
MUTE1, 4
VCC1
GND
KA3021D
21
GND
20
OPOUT VCC2
17
DO2+
13
16
DO2- GND
GND
2
8 9 10 11 NC 12 14
VCC3
IN3 19 18 15 CTL
DO3+ DO3-
FWD REV
KA3021D
KA3021D
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 DO1- DO1+ IN1 IN1.1 OPIN+ OPIN- MUTE1, 4 GND OPOUT VCC2 NC DO2+ DO2- GND REV FWD DO3- DO3+ CTL IN3 VCC3 VCC1 REF IN4.1 IN4 DO4+ DO4- GND I/O O O I I I I I O I O O I I O O I I I I I I I O O Drive1 output (-) Drive1 output (+) Drive1 input Drive1 input gain adjust Op-amp input (+) Op-amp input (-) CH1, 4 mute Ground Op-amp output Power supply for CH2 and signal No connection Drive2 output (+) Drive2 output (-) Ground CH2 reverse CH2 forward Drive3 output (-) Drive3 output (+) CH2 motor speed control Ch3 input Power supply for CH3 Power supply for CH1,4 Bias voltage input Drive4 input gain adjust Drive4 input Drive4 output (+) Drive4 output (-) Ground Pin Function Description
3
KA3021D
Internal Block Diagram
VCC1 VCC3 DO4+ DO3+ DO4- DO3- IN4.1 FWD GND REV 15 14 GND REF CTL 19
IN4
28 X2
27
26 X2
25 10k
24
23
22
21
20
IN3
18
17
16
D
D 10k + - +
VCC1
VCC3 10k
X2
X2
- 15k - +
TSD
SW + - 10k D X2 1 DO1- X2 2 DO1+ 3 IN1 4 IN1.1 5 OPIN+ 6 OPIN- 7 MUTE1, 4 8 GND 9 OPOUT 10 VCC2 11 NC 12 DO2+ 13 DO2- D 10k MUTE1, 4 - + + MSC -
VCC2
4
KA3021D
Equivalent Circuits
Mute input Power output
1
2
12 13 50k 7 50 50k 17 18 26 27
Signal reference input
loading control input
23 50 0.2k 19 50 50k 50k
Loading logic input
15 16 50 30k 30k
5
KA3021D
Absolute Maximum Ratings (Ta = 25C)
Parameter Maximum supply voltage Power dissipation Operating temperature range Storage temperature range Symbol VCCmax PD TOPR TSTG Value 18 1.7
note
Unit V W C C
-35 ~ +85 -55 ~ +150
NOTE: 1. When mounted on a 50mm x 50mm x 1mm PCB (Phenolic resin material). 2. Power dissipation reduces 13.6mW / C for using above Ta = 25C 3. Do not exceed PD 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 = 25C)
Parameter Supply voltage Symbol VCC Min 4.5 Typ Max 13.2 Unit V
6
KA3021D
Electrical Characteristics
(Unless otherwise specified, Ta=25C, VCC1=VCC3=5V,VCC2=12V) Parameter Quiescent current Mute on current Mute on voltage Mute off voltage DRIVE CIRCUIT Output offset voltage Maximum output voltage1 (High level) Maximum output voltage2 (Low level) Closed loop voltage gain1 Closed loop voltage gain2 Ripple rejection ratio Slew rate Input high level voltage Input low level voltage Output voltage1 Output voltage2 Output load regulation Output offset voltage1 Output offset voltage2 GENERAL OF AMP CIRCUIT Input offset voltage Input bias current High level output voltage Low level output voltage Output sink current Output source current Open loop voltage gain Ripple rejection ratio Slew rate Common mode rejection ratio Common mode input range VOFOP IBOP VOHOP VOLOP ISINK ISOURCE GVO RROP SROP CMRR VICM VCC=5V, RL=1k VCC=5V, RL=1k VCC=5V, RL=50 VCC=5V, RL=50 VIN=-75dB, f=1kHz VIN=-20dB, f=120Hz f=120kHz, 2Vp-p VIN=-20dB, f=1kHz VCC=8V -20 3 0.7 10 10 -0.3 4 1 20 20 75 65 1 80 +20 300 1.3 6.8 mV nA V V mA mA dB dB V / s dB V VOO VOM1 VOM2 GVC1 GVC2 RR SR VIH VIL VO1 VO2 VRL VOO1 VOO2 VIN=5V VIN=5V VIN=2.5V VCC=8V, RL=8 (CH1,3,4) VCC=8V, RL=8 (CH1,3,4) f=1kHz, VIN=0.1VRMS (CH1,4) f=1kHz, VIN=0.1VRMS (CH3) VIN=0.1VRMS, f=120Hz VO=2Vp-p, f=120kHz VCC=8V, VCTL=6.5V VCC=13V, VCTL=4.5V -40 5 9.5 13.0 2 5.2 7.5 -40 -40 6.0 -6.0 11.5 15.0 60 0.8 6 8.5 300 +40 -5 13.5 17.5 0.5 6.8 9.5 700 +40 +40 mV V V dB dB dB V / s V V V V mV mV mV Symbol ICC IMUTE VMon VMoff VIN=0V Mute pin=GND Conditions Min. 2.0 Typ. 6 4.5 Max. 15 8 0.5 Units mA mA V V
TRAY DRIVE CIRCUIT(VCC2 =VCC3 = 8V, RL = 45)
7
KA3021D
Application Information
1. REFERENCE INPUT & ALL MUTE FUNCTION Pin 23 (REF) is a reference input pin. * Reference input The applied voltage at the reference input pin must be between 1.4V and 6.5V, when VCC=8.5V. * Mute input The following input conditions must be satisfied for the normal mute function. All mute on voltage All mute off voltage 2. PROTECTION FUNCTION Thermal shutdown (TSD) * If 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 thermal shutdown(TSD) circuit has a temperature hysteresis of 25C Below 1V Above 1.4V Mute function operation Normal operation
8
KA3021D
3. FOCUS, TRACKING ACTUATOR, SLED MOTOR DRIVE PART
M Power amp R4 AP2 - R3 23 + Vr R3 - LEVEL AP1 - + + Vref R1 AP3 - R2
4 24
R4
+ SHIFT
+
-
3 20 25
* The reference voltage REF is given externally through pin 23. * The input signal,pin3,20.25 is amplified by R2 / R1 times and then fed to the level shift circuit. * The level shift circuit produces the differential output voltages and drives the two output power amplifiers. Since the differential gain of the output amplifiers is equal to 2 x (1+ R4 / R3), input signal is amplified by (R2 / R1) x 2 x (1 + R4 / R3). * If the total gain is insufficient, the external resistors can be used through pin 4, 24 to increase the gain. * The bias voltage (Vref) is about a half of the supply voltage(VM). 4. TRAY MOTOR DRIVE PART
DO2+ 12
M
DO2- 13
D
D
LEVEL SHIFT
CTL 19
M.S.C
S.W
IN
IN
FWD 16
REV 15
9
KA3021D
* Rotational direction control The forward and reverse rotational direction is controlled by FWD (pin 16) and REV (pin 15) inputs. Conditions are as follows. Input FWD H H L L REV H L H L DO2+ Vr H L Vr Output DO2- - Vr L H Vr State Brake Forward Reverse Brake
* Motor speed control - The motor speed is proportional to the differential voltage between the pin12 (DO2+) and the pin13 (DO2-). - By applying the voltage to the pin19 of CTL, the motor speed can be controlled and it is linearly proportional to the applied control voltage. - Motor torque is maximum when pin 19 is open.
10
KA3021D
Typical Application Circuits
FOCUS ACTUATOR
1 2
DO1- DO1+ IN1
GND 28 DO4- 27 DO4+ 26 IN4 25 IN4.1 24 REF 23 REF(typically 1.675V)
TRACKING ACTUATOR
3 SERVO FOCUS AMP TRACKING SLED IN4.1 IN3
4
IN1.1
5
OPIN+ OPIN-
6
1,4CH MUTE
7
MUTE1,4
VCC1 22 5V
KA3021D
8 GND OPTPUT VCC3 21 12V 9 IN3 20
10 VCC2 12V 11 NC 12 DO2+ TRAY MOTOR 13 DO2- 14 GND
CTL 19 DO3+ 18 SLED MOTOR DO3- 17 CONTROL (TRAY) FORWARD
FWD 16 REV 15
REVERSE
11
KA3021D
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 INTERNATIONAL. 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 12/1/00 0.0m 001 Stock#DSxxxxxxxx 2000 Fairchild Semiconductor International
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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