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