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L6242 Scheda tecnica(PDF) 2 Page - STMicroelectronics

Il numero della parte L6242
Spiegazioni elettronici  VOICE COIL MOTOR DRIVER
Download  5 Pages
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Produttore elettronici  STMICROELECTRONICS [STMicroelectronics]
Homepage  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

L6242 Scheda tecnica(HTML) 2 Page - STMicroelectronics

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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
Ω) 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 converts the
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
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.
ABSOLUTE MAXIMUM RATINGS
Symbol
Parameter
Value
Unit
VS
Supply Voltage
28
V
Vi
Input Voltage
VS
V
Vi
Differential Input Voltage
±VS
V
IO
DC Output Current
1
A
IP
Peak Output Current (non repetitive)
1.5
A
Ptot
Maximum Power Dissipation at Tamb =85
°C
TCASE =75
°C
1
5
W
W
Tstg,TJ
Storage and Junction Temperature Range
-40 to 150
°C
ELECTRICAL CHARACTERISTICS (VS = 12V, TJ =25
°C unless otherwise specified)
Symbol
Parameter
Test Condition
Min.
Typ.
Max.
Unit
VS
Supply Voltage
4
28
V
IS
Quiescent Drain Current
VO =VS/2
10
15
mA
Ib
Input Bias Current
0.2
1
µA
VOS
Input Offset Voltage
15
mV
IOS
Input Offset Current
10
50
nA
Sr
Slew Rate
1.5
V/
µs
Ri
Input Resistance
500
K
GV
Open Loop Voltage Gain
f = 100Hz
70
80
dB
CMR
Common Mode Rejection
f = 100Hz
66
84
dB
SVR
Supply Voltage Rejection
f = 100Hz Rg = 10K
Vr = 0.5V
54
dB
Vdrop
High Drop Voltage
I = 100mA
I = 500mA
0.7
1
1.5
V
V
Vdrop
Low Drop Voltage
I = 100mA
I = 500mA
0.3
0.6
1
V
V
Tsd
Thermal Shutdown Junction Temperature
145
°C
Rp
Internal Pull-up Resistor of the Enable Input
50
K
Ve
Enable Low Voltage
TJ = 130
°C
-0.3
1.2
V
Ieq
Quiescent Drain Current
En = L
2
5
mA
Td
Enable Delay
50
µs
Iol
Output Leakage Current
10
µA
L6242
2/5


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