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PDF LT3092 Data sheet ( Hoja de datos )
| Número de pieza | LT3092 | |
| Descripción | 200mA Two-Terminal Programmable Current Source | |
| Fabricantes | Linear Technology Corporation | |
| Logotipo |  |
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LT3092
200mA 2-Terminal
Programmable Current Source
FEATURES
n Programmable 2-Terminal Current Source
n Maximum Output Current: 200mA
n Wide Input Voltage Range: 1.2V to 40V
n Input/Output Capacitors Not Required
n Resistor Ratio Sets Output Current
n Initial Set Pin Current Accuracy: 1%
n Reverse-Voltage Protection
n Reverse-Current Protection
n <0.001%/V Line Regulation Typical
n Current Limit and Thermal Shutdown Protection
n Available in 8-Lead SOT-23, 3-Lead SOT-223 and
8-Lead 3mm × 3mm DFN Packages
APPLICATIONS
n 2-Terminal Floating Current Source
n GND Referred Current Source
n Variable Current Source
n In-Line Limiter
n Intrinsic Safety Circuits
DESCRIPTION
The LT®3092 is a programmable 2-terminal current
source. It requires only two resistors to set an output
current between 0.5mA and 200mA. A multitude of analog
techniques lend themselves to actively programming the
output current. The LT3092 is stable without input and
output capacitors, offering high DC and AC impedance. This
feature allows operation in intrinsically safe applications.
The SET pin features 1% initial accuracy and low tem-
perature coefficient. Current regulation is better than
10ppm/V from 1.5V to 40V.
The LT3092 can operate in a 2-terminal current source
configuration in series with signal lines. It is ideal for driv-
ing sensors, remote supplies, and as a precision current
limiter for local supplies.
Internal protection circuitry includes reverse-battery and
reverse-current protection, current limiting and thermal
limiting. The LT3092 is offered in the 8-lead TSOT-23,
3-lead SOT-223 and 8-lead 3mm × 3mm DFN packages.
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear
Technology Corporation. All other trademarks are the property of their respective owners.
TYPICAL APPLICATION
Adjustable 2-Terminal Current Source
VIN – VOUT = 1.2V TO 40V
LT3092
IN
10μA
+
–
SET OUT
RSET
ROUT
3092 TA01a
ISOURCE
=
10µA
•
RSET
ROUT
SET Pin Current vs Temperature
10.100
10.075
10.050
10.025
10.000
9.975
9.950
9.925
9.900
–50 –25
0 25 50 75 100 125 150
TEMPERATURE (°C)
3092 TA01b
3092fb
1
1 page  
TYPICAL PERFORMANCE CHARACTERISTICS
LT3092
Minimum Output Current
600
500
400
300
200
100
0
–50 –25
0 25 50 75 100 125 150
TEMPERATURE (°C)
3092 G08
Dropout Voltage
1.6
1.4
TJ = –55°C
1.2
TJ = 25°C
1.0
0.8 TJ = 125°C
0.6
0.4
0.2
0
0 25 50 75 100 125 150 175 200
LOAD CURRENT (mA)
3092 G09
Dropout Voltage
1.4
1.2 ILOAD = 200mA
1.0 ILOAD = 100mA
0.8
0.6
0.4
0.2
0
–50 –25
0 25 50 75 100 125 150
TEMPERATURE (°C)
3092 G10
Current Limit
400
350
300
250
200
150
100
50
TJ = 25°C
0
0 2 4 6 8 10
INPUT-TO-OUTPUT DIFFERENTIAL VOLTAGE (V)
3092 G11
Current Limit
500
450
400
350
300
250
200
150
100
50
VIN = 7V
VOUT = 0V
0
–50 –25 0 25 50 75 100
TEMPERATURE (°C)
125 150
3092 G12
Line Transient Response
8
6
4 1.5
2 1mA CURRENT SOURCE 1.0
CONFIGURATION
0 0.5
0
–0.5
–1.0
0 10 20 30 40 50 60 70 80 90 100
TIME (μs)
3092 G13
Line Transient Response
10
8
6 10mA CURRENT SOURCE
CONFIGURATION
4 10
25
0
–5
–10
0 10 20 30 40 50 60 70 80 90 100
TIME (μs)
3092 G14
3092fb
5
5 Page 
LT3092
APPLICATIONS INFORMATION
capacitor on the lower impedance output, and the same
restrictions do not apply. Capacitors in the range of 0.1μF
to 1μF usually provide sufficient bypassing on the input,
and the value of input capacitance may be increased
without limit.
If an application uses GND referred capacitors on the input
or output (particularly the input), pay attention to the length
of the lines powering and returning ground from the circuit.
In the case where long power supply and return lines are
coupled with low ESR input capacitors, application-specific
voltage spikes, oscillations and reliability concerns may
be seen. This is not an issue with LT3092 stability, but
rather the low ESR capacitor forming a high-Q resonant
tank circuit with the inductance of the input wires. Adding
series resistance with the input of the LT3092, or with the
input capacitor, often solves this. Resistor values of 0.1Ω
to 1Ω are often sufficient to dampen this resonance.
Give extra consideration to the use of ceramic capacitors.
Ceramic capacitors are manufactured with a variety of di-
electrics, each with different behavior across temperature
and applied voltage. The most common dielectrics used
are specified with EIA temperature characteristic codes of
Z5U, Y5V, X5R and X7R. The Z5U and Y5V dielectrics are
good for providing high capacitances in a small package,
but they tend to have strong voltage and temperature
coefficients as shown in Figures 5 and 6. When used with
a 5V regulator, a 16V 10μF Y5V capacitor can exhibit an
effective value as low as 1μF to 2μF for the DC bias voltage
applied and over the operating temperature range. The X5R
and X7R dielectrics result in more stable characteristics
and are more suitable for use as the output capacitor.
The X7R type has better stability across temperature,
while the X5R is less expensive and is available in higher
values. Care still must be exercised when using X5R and
X7R capacitors; the X5R and X7R codes only specify
operating temperature range and maximum capacitance
change over temperature. Capacitance change due to DC
bias with X5R and X7R capacitors is better than Y5V and
Z5U capacitors, but can still be significant enough to drop
capacitor values below appropriate levels. Capacitor DC
bias characteristics tend to improve as component case
size increases, but expected capacitance at operating
voltage should be verified.
Voltage and temperature coefficients are not the only
sources of problems. Some ceramic capacitors have a
piezoelectric response. A piezoelectric device generates
voltage across its terminals due to mechanical stress. In a
ceramic capacitor the stress can be induced by vibrations
in the system or thermal transients.
20
BOTH CAPACITORS ARE 16V,
1210 CASE SIZE, 10μF
0
X5R
–20
–40
–60
Y5V
–80
–100
0 2 4 6 8 10 12 14 16
DC BIAS VOLTAGE (V)
3092 F05
Figure 5. Ceramic Capacitor DC Bias Characteristics
40
20
0 X5R
–20
–40
Y5V
–60
–80 BOTH CAPACITORS ARE 16V,
1210 CASE SIZE, 10μF
–100
–50 –25 0 25 50 75
TEMPERATURE (°C)
100 125
3092 F06
Figure 6. Ceramic Capacitor Temperature Characteristics
3092fb
11
11 Page | ||
| Páginas | Total 22 Páginas | |
| PDF Descargar | [ Datasheet LT3092.PDF ] | |
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