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參數(shù)資料
| 型號(hào)： | L6242 |
| 廠商： | 意法半導(dǎo)體 |
| 元件分類： | 基準(zhǔn)電壓源/電流源 |
| 英文描述： | VOICE COIL MOTOR DRIVER |
| 中文描述： | 音圈電機(jī)驅(qū)動(dòng) |
| 文件頁數(shù)： | 2/5頁 |
| 文件大?。?/td> | 94K |
| 代理商： | L6242 |
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 1
) 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-
plifier. R1 closes the control loop. R2 convertsthe
input voltage signal, into a current signal.
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
motorcharacteristics.
The DC transferfunctionmay be expressedas:
gm = Iout/Vin = k
(R1/R2)
where k = 1/(Rsense
Ad)
and Ad = gain of thecurrent senseamplifier.
ABSOLUTE MAXIMUMRATINGS
Symbol
V
S
V
i
V
i
I
O
I
P
P
tot
Parameter
Value
28
VS
±
V
S
1
1.5
1
5
-40 to 150
Unit
V
V
V
A
A
W
W
°
C
Supply Voltage
Input Voltage
Differential Input Voltage
DC Output Current
Peak Output Current (non repetitive)
Maximum Power Dissipation at T
amb
= 85
°
C
T
CASE
= 75
°
C
T
stg
, T
J
Storage and Junction Temperature Range
ELECTRICALCHARACTERISTICS
(V
S
= 12V, T
J
= 25
°
C unless otherwisespecified)
Symbol
V
S
I
S
I
b
V
OS
I
OS
S
r
R
i
G
V
CMR
SVR
Parameter
Test Condition
Min.
4
Typ.
Max.
28
15
1
15
50
Unit
V
mA
μ
A
mV
nA
V/
μ
s
K
dB
dB
dB
Supply Voltage
Quiescent Drain Current
Input Bias Current
Input Offset Voltage
Input Offset Current
Slew Rate
Input Resistance
Open Loop Voltage Gain
Common Mode Rejection
Supply Voltage Rejection
V
O
= V
S
/2
10
0.2
10
1.5
500
70
66
f = 100Hz
f = 100Hz
f = 100Hz R
g
= 10K
V
r
= 0.5V
I = 100mA
I = 500mA
I = 100mA
I = 500mA
80
84
54
V
drop
High Drop Voltage
0.7
1
0.3
0.6
145
1.5
V
V
V
V
°
C
K
V
mA
μ
s
μ
A
V
drop
Low Drop Voltage
1
T
sd
R
p
V
e
I
eq
T
d
I
ol
Thermal Shutdown Junction Temperature
Internal Pull-up Resistor of the Enable Input
Enable Low Voltage
Quiescent Drain Current
Enable Delay
Output LeakageCurrent
50
1.2
5
50
T
J
= 130
°
C
En = L
-0.3
2
10
L6242
2/5
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