L6242 [STMICROELECTRONICS]
VOICE COIL MOTOR DRIVER; 音圈电机驱动器
| 型号： | L6242 |
| 厂家： | 
ST |
| 描述： | VOICE COIL MOTOR DRIVER |
| 文件： | 总5页 (文件大小：96K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
L6242
VOICE COIL MOTOR DRIVER
ADVANCE DATA
OUTPUT CURRENT UP TO 1A
OPERATES AT LOW VOLTAGES WITH LOW
COIL RESISTANCE OF THE MOTOR
LARGE COMMON MODE AND DIFFEREN-
TIAL MODE RANGE
LOW INPUT OFFSET VOLTAGE
THERMAL SHUT-DOWN
ENABLE FUNCTION
INTERNAL CLAMP DIODES
SO20
ORDERING NUMBER: L6242
DESCRIPTION
The L6242 is a monolithic integratedcircuit in SO-20
package intended for use as a dual power opera-
tional amplifier. It is particularly indicated for driv-
ing inductive loads as linear motor, and finds ap-
plication in Hard Disc, Compact-Disc, etc.
The two power operational amplifiers are control-
led by a common enable input.
The high gain and output power capability provide
superior performance whatever a power booster
is required.
PIN CONNECTION AND BLOCK DIAGRAM
1/5
November 1991
This is advanced information on a new product now in development or undergoing evaluation. Details are subject to change without notice.
is advanced information on a new product now in development or undergoing evaluation. Details are subject to change without
T
L6242
ABSOLUTE MAXIMUM RATINGS
Symbol
Parameter
Value
28
Unit
V
VS
Vi
Supply Voltage
Input Voltage
VS
±VS
1
V
Vi
Differential Input Voltage
DC Output Current
V
IO
A
IP
Peak Output Current (non repetitive)
1.5
A
Ptot
Maximum Power Dissipation at Tamb = 85°C
1
5
W
W
TCASE = 75°C
Tstg, TJ
Storage and Junction Temperature Range
-40 to 150
°C
ELECTRICAL CHARACTERISTICS (VS = 12V, TJ = 25°C unless otherwise specified)
Symbol
VS
Parameter
Test Condition
Min.
Typ.
Max.
28
15
1
Unit
V
Supply Voltage
4
IS
Quiescent Drain Current
Input Bias Current
VO = VS/2
10
mA
µA
Ib
0.2
VOS
IOS
Input Offset Voltage
Input Offset Current
Slew Rate
15
50
mV
nA
10
Sr
1.5
V/µs
KΩ
dB
Ri
Input Resistance
500
70
GV
Open Loop Voltage Gain
Common Mode Rejection
Supply Voltage Rejection
f = 100Hz
f = 100Hz
80
84
54
CMR
SVR
66
dB
f = 100Hz Rg = 10KΩ
dB
Vr = 0.5V
Vdrop
Vdrop
High Drop Voltage
Low Drop Voltage
I = 100mA
I = 500mA
0.7
1
V
V
1.5
1
I = 100mA
I = 500mA
0.3
0.6
V
V
Tsd
Rp
Ve
Ieq
Td
Iol
Thermal Shutdown Junction Temperature
Internal Pull-up Resistor of the Enable Input
Enable Low Voltage
145
°C
KΩ
V
50
1.2
5
TJ = 130°C
-0.3
Quiescent Drain Current
En = L
2
mA
µs
Enable Delay
50
Output Leakage Current
10
µA
plifier. R1 closes the control loop. R2 converts the
input voltage signal, into a current signal.
APPLICATION INFORMATIONS
Figure 1 shows the L6242 configurated as a tran-
sconductance amplifier, in order to drive linear
motors as Voice Coil (VCM). The L6242 provides
the power section of the Transconductance Am-
plifier. The two OP AMP are configurated one as
inverting and the other as noninverting amplifier,
with the same gain. Working in push-pull, they
can be configurated as a bridge. The motor cur-
rent can be controlled by means of the sense re-
sistor (typical 1Ω) in series with the motor. The
current sense amplifier provides the feedback sig-
nal, which is summed to the driving signal at the
node which is the inverting input of the Error Am-
The snubber network provides the system stabil-
ity, always required by the application. The net-
work is directly connected to the output pins of
the IC, OUT1 and OUT2, and in parallel with the
load. R4 and C2 could be of different values, de-
pending on the p.c.b. configuration and on the
motor characteristics.
The DC transfer function may be expressed as:
gm = Iout/Vin = k • (R1/R2)
where k = 1/(Rsense • Ad)
and Ad = gain of the current sense amplifier.
2/5
L6242
Figure 1: Voice Coil Motor Control Circuit
cross the ground traces for the power signals.
Logic ground and power ground must meet at
one point on the board (startpoint grounding) far
enough away from where the power ground
traces terminate to ground (sense resistors and
recirculation diodes). This is to avoid anomalous
interface with the logic signals. It is generally a
good idea to connect a non inductive capacitor
(typically 100nF) between the pins VS and GND.
In other cases it may be necessary to also place
a by-pass capacitor between the pins Vref and
GND.
OPTIMIZING LAYOUT
Optimizing a PC board layout involves to observe
the following rules which in general can avoid ap-
plication problems associated with ground loops
and anomalous recirculation currents. The elec-
trolytic capacitor for the power supply must be
kept as close to the IC as possible. It is important
that power grounds are close to each other on a
wide enough. Copper side also, it is important to
separate on the board the logic ground and the
power ground in such a way that the ground
traces for the logic signals and references do not
3/5
L6242
SO20 PACKAGE MECHANICAL DATA
mm
inch
TYP.
DIM.
MIN.
TYP.
MAX.
2.65
0.3
MIN.
MAX.
0.104
0.012
0.096
0.019
0.013
A
a1
a2
b
0.1
0.004
2.45
0.49
0.32
0.35
0.23
0.014
0.009
b1
C
0.5
0.020
c1
D
45 (typ.)
12.6
10
13.0
0.496
0.394
0.512
0.419
E
10.65
e
1.27
0.050
0.450
e3
F
11.43
7.4
0.5
7.6
0.291
0.020
0.299
0.050
0.030
L
1.27
0.75
M
S
8 (max.)
4/5
L6242
Information furnished is believed to be accurate and reliable. However, SGS-THOMSON Microelectronics assumes no responsibility for the
consequences of use of such information nor for any infringement of patents or other rights of third parties which may result from its use. No
license is granted by implication or otherwise under any patent or patent rights of SGS-THOMSON Microelectronics. Specifications men-
tioned in this publication are subject to change without notice. This publication supersedes and replaces all information previously supplied.
SGS-THOMSON Microelectronics products are not authorized for use as critical components in life support devices or systems without ex-
press written approval of SGS-THOMSON Microelectronics.
1994 SGS-THOMSON Microelectronics - All RightsReserved
SGS-THOMSON Microelectronics GROUP OF COMPANIES
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5/5
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