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PDF LTC6103 Data sheet ( Hoja de datos )
| Número de pieza | LTC6103 | |
| Descripción | High Side Current Sense Amplifier | |
| Fabricantes | Linear | |
| Logotipo |  |
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FEATURES
■ Two Independent Current Sense Amplifiers
■ Wide Supply Range: 4V to 60V, 70V Absolute
Maximum
■ Low Offset Voltage: 450µV Maximum
■ Fast Response: 1µs Response Time
■ Gain Configurable with External Resistors
■ Low Input Bias Current: 170nA Maximum
■ PSRR: 110dB Minimum (6V to 60V)
■ Output Current: 1mA Maximum
■ Low Supply Current: 275µA per Amplifier, VS = 12V
■ Specified for –40°C to 125°C Temperature Range
■ Available in an 8-lead MSOP Package
APPLICATIONS
■ Current Shunt Measurement
■ Battery Monitoring
■ Remote Sensing
■ Power Management
■ High Voltage Level Translator
LTC6103
Dual High Voltage, High Side
Current Sense Amplifier
DESCRIPTION
The LTC®6103 is a versatile, high voltage, high side, dual
current sense amplifier. The two internal amplifiers are
independent except that they share the same V– terminal.
Design flexibility is provided by the excellent device char-
acteristics: 450µV maximum offset, and only 275µA of
current consumption (typical at 12V) for each amplifier.
The LTC6103 operates on supplies from 4V to 60V.
The LTC6103 monitors current via the voltage across an
external sense resistor (shunt resistor). Internal circuitry
converts input voltage to output current, allowing for a
small sense signal on a high common mode voltage to be
translated into a ground referenced signal. Low DC offset al-
lows the use of a small shunt resistor and large gain-setting
resistors. As a result, power loss in the shunt is minimal.
The wide operating supply range and high accuracy make
the LTC6103 ideal for an extensive variety of applications
from automotive to industrial and power management.
The fast response makes the LTC6103 the perfect choice
for load current warnings and shutoff protection control.
With very low supply current, the LTC6103 is suitable for
power sensitive applications.
The LTC6103 is available in an 8-lead MSOP package.
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
TYPICAL APPLICATION
Two 16-Bit Current Sense Channels Connected Directly to the LTC2436-1 ADC
VA+
ILOAD –VSENS+E
VB+
+VSENS–E
ILOAD
LOAD
8
+INA
RIN
100Ω
7
–INA
+–
VSA
RIN
100Ω
LOAD
65
–INB +INB
–+
VSB
LTC6103 OUTA
1
V– OUTB
42
ROUT
4.99k
ROUT
4.99k
5V 1µF
6
CH1
7
2
1
4 LTC2436-1
5
CH0
13
12
TO µP
11
3,8,9,10,14,15,16
6103 TA01a
Step Response
VSENSE–
∆VSENSE– = 100mV
5.5V
5V
IOUT = 100µA
VOUT
0.5V
0V
IOUT = 0µA
500ns/DIV
TA = 25°C
V+ = 12V
RIN = 100Ω
ROUT = 5k
VSENSE+ = V+
6103 TA01b
6103f
1
1 page  
TYPICAL PERFORMANCE CHARACTERISTICS
LTC6103
Step Response 0mV to 100mV
VSENSE–
∆VSENSE– =100mV
CLOAD = 10pF
5V
CLOAD = 1000pF
TA = 25°C
V+ = 12V
RIN = 100Ω
ROUT = 5k
VSENSE+ = V+
0V VOUT
TIME (10µs/DIV)
Step Response 0mV to 100mV
V+
VSENSE–
∆VSENSE– =100mV
TA = 25°C
V+ = 12V
5V CLOAD = 2200pF
RIN = 100Ω
ROUT = 5k
VSENSE+ = V+
0V VOUT
TIME (100µs/DIV)
Step Response Rising Edge
VSENSE–
∆VSENSE– =100mV
5.5V
5V
VOUT
0.5V
0V
TA = 25°C
V+ = 12V
RIN = 100Ω
ROUT = 5k
VSENSE+ = V+
IOUT = 100µA
IOUT = 0µA
TIME (500ns/DIV)
6103 G13
Step Response Falling Edge
V+
5.5V VOUT
5V
∆VSENSE– =100mV
TA = 25°C
V+ = 12V
RIN = 100Ω
ROUT = 5k
VSENSE+ = V+
IOUT = 0µA
IOUT = 100µA
0.5V
0V
TIME (500ns/DIV)
6103 G16
6103 G14
PSRR vs Frequency
140
120
100
VS = 12V
80
VS = 4V
60
RIN = 100Ω
40 ROUT = 5k
COUT = 5pF
20
GAIN = 50
IOUTDC = 100µA
0 VINAC = 50mVP-P
0.1 1 10 100 1k 10k
FREQUENCY (Hz)
100k
1M
6103 G17
6103 G15
6103f
5
5 Page 
LTC6103
APPLICATIONS INFORMATION
If the power dissipation of the sense resistor is chosen to
be less than 0.5W then:
RSENSE
≤
500mW
ISENSE(MAX)2
=
500mΩ
VSENSE(MAX) = ISENSE(MAX) • RSENSE = 500mV
Gain = ROUT = VOUT(MAX) = 3V = 6
RIN VSENSE(MAX) 500mV
If the maximum output current, IOUT, is limited to 1mA:
ROUT
=
3V
1mA
≈
3.01k
(1%
value)
and
RIN
=
3k
6
≈
499Ω
(1%
value)
The output error due to DC offset is ±510µV (typ) and the
error due to offset current:
IOS is 3kΩ × 100nA = ±300µV (typical)
The maximum output error can therefore reach ±810µV
or 0.027% (–71dB) of the output full scale. Considering
the system input 60dB dynamic range (ISENSE = 1mA to
1A), the 71dB performance of the LTC6103 makes this
application feasible.
In many applications the power dissipation of the sense
resistor is of greater importance than the precision of the
measurement. Designing for a VSENSE(MAX) of as low as
100mV is recommended in such cases.
Output Current Limitations Due to Power Dissipation
The LTC6103 can deliver up to 1mA continuous current to
the output pin. This current flows through RIN and enters
the current sense amp via the –IN pin. The power dissipated
in the LTC6103 due to the output signal is:
POUT = (VIN– – VOUT) • IOUT
Since VIN– ≈ VS, POUT ≈ (VS – VOUT) • IOUT
There is also power dissipated due to the quiescent sup-
ply current:
PQ = IS • VS
The total power dissipated is the output dissipation plus
the quiescent dissipation:
PTOTAL = POUTA + POUTB + PQA + PQB
At maximum supply and maximum output current, the
total power dissipation can exceed 100mW. This will
cause significant heating of the LTC6103 die. In order to
prevent damage to the LTC6103, the maximum expected
dissipation in each application should be calculated. This
number can be multiplied by the θJA value listed in the
Package/Order Information to find the maximum expected
die temperature. This must not be allowed to exceed 150°C
or performance may be degraded.
As an example, if an LTC6103 in the MS8 package is to
be run at 55V ±5V supply with 0.5mA output current in
both amplifiers at 80°C:
PQ(MAX) = IS(MAX) • V+ (MAX) • 2 = 82.8mW
POUT(MAX) = IOUT • V+ (MAX) • 2 = 60mW
TRISE = θJA • PTOTAL(MAX) = 300°C/W • (82.8mW +
60mW) ≈ 43°C
TMAX = TAMBIENT + TRISE = 80°C + 43°C = 123°C
TMAX must be <150°C
PTOTAL(MAX) ≈ 143mW and the maximum die tempera-
ture will be 123°C
If this same circuit must run at 125°C, the maximum die
temperature will exceed 150°C. (Note that supply current,
and therefore PQ, is proportional to temperature. Refer to
the Typical Performance Characteristics.) In this condition,
the maximum output current should be reduced to avoid
device damage. It is important to note that the LTC6103
has been designed to provide at least 1mA to the output
when required, and can deliver more depending on the
conditions. Care must be taken to limit the maximum
output current by proper choice of resistors and, if input
fault conditions exist, external clamps.
Output Filtering
The output voltage, VOUT, is simply IOUT • ZOUT. This
makes filtering straightforward. Any circuit may be used
which generates the required ZOUT to get the desired filter
response. For example, a capacitor in parallel with ROUT
6103f
11
11 Page | ||
| Páginas | Total 16 Páginas | |
| PDF Descargar | [ Datasheet LTC6103.PDF ] | |
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