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PDF LT1999-20 Data sheet ( Hoja de datos )
| Número de pieza | LT1999-20 | |
| Descripción | Bidirectional Current Sense Amplifier | |
| Fabricantes | Linear | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de LT1999-20 (archivo pdf) en la parte inferior de esta página. Total 26 Páginas | ||
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LT1999-10/LT1999-20/
LT1999-50
High Voltage, Bidirectional
Current Sense Amplifier
Features
nn Buffered Output with 3 Gain Options:
10V/V, 20V/V, 50V/V
nn Gain Accuracy: 0.5% Max
nn Input Common Mode Voltage Range: –5V to 80V
nn AC CMRR > 80dB at 100kHz
nn Input Offset Voltage: 1.5mV Max
nn –3dB Bandwidth: 2MHz
nn Smooth, Continuous Operation Over Entire Common
Mode Range
nn 4kV HBM Tolerant and 1kV CDM Tolerant
nn Low Power Shutdown <10µA
nn –55°C to 150°C Operating Temperature Range
nn 8-Lead MSOP and 8-Lead SO (Narrow) Packages
nn 8-Lead MSOP Pinout Option Engineered for FMEA
Applications
nn High Side or Low Side Current Sensing
nn H-Bridge Motor Control
nn Solenoid Current Sense
nn High Voltage Data Acquisition
nn PWM Control Loops
nn Fuse/MOSFET Monitoring
Description
The LT®1999 is a high speed precision current sense am-
plifier, designed to monitor bidirectional currents over a
wide common mode range. The LT1999 is offered in three
gain options: 10V/V, 20V/V, and 50V/V.
The LT1999 senses current via an external resistive shunt
and generates an output voltage, indicating both magnitude
and direction of the sensed current. The output voltage is
referenced halfway between the supply voltage and ground,
or an external voltage can be used to set the reference
level. With a 2MHz bandwidth and a common mode input
range of –5V to 80V, the LT1999 is suitable for monitor-
ing currents in H-Bridge motor controls, switching power
supplies, solenoid currents, and battery charge currents
from full charge to depletion.
The LT1999 operates from an independent 5V supply
and draws 1.55mA. A shutdown mode is provided for
minimizing power consumption.
The LT1999 is available in an 8-lead SOP, an 8-lead MSOP
(original pinout), or an 8-lead pinout option engineered
for FMEA.
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
VS
RS
5V
1
V+
V+IN 2
4k
V–IN
V+
3 4k
5V
4
0.1µF
V+
LT1999
SHDN
+
–
0.8k
0.8k
V+
2µA
RG
8 VSHDN
–
+
V+
7 VOUT
160k
6 VREF
160k
5
0.1µF
1999 TA01a
For more information www.linear.com/LT1999
Full Bridge Armature Current Monitor
VOUT
2.5V
V+IN
TIME (10µs/DIV)
1999 TA01b
1999fd
1
1 page  
LT1999-10/LT1999-20/
LT1999-50
E lectrical Characteristics The l denotes the specifications which apply over the full operating
VteRmEFpe=rfaltouarteinrga,nVgeSH, D–N5=5°flCoa<tiTnAg<,
150°C
unless
for MP-grade parts, otherwise specifications
otherwise specified. See Figure 2.
are
at
TA
=
25°C.
V+ = 5V, GND = 0V, VCM = 12V,
SYMBOL
VSENSE
PARAMETER
Full-Scale Input Sense Voltage (Note 7)
VSENSE = V+IN – V–IN
CONDITIONS
LT1999-10
LT1999-20
LT1999-50
MIN
l –0.35
l –0.2
l –0.08
TYP
MAX
0.35
0.2
0.08
UNITS
V
V
V
VCM
RIN(DIFF)
RINCM
CM Input Voltage Range
Differential Input Impedance
CM Input Impedance
VOSI Input Referred Voltage Offset
ΔVINDIFF = ±2V/GAIN
ΔVCM = 5.5V to 80V
ΔVCM = –5V to 4.5V
ΔVOSI/ΔT Input Referred Voltage Offset Drift
AV Gain
AV Error
IB
IOS
PSRR
CMRR
Gain Error
Input Bias Current
I(+IN) = I(–IN)
(Note 8)
Input Offset Current
IOS = I(+IN) – I(–IN)
(Note 8)
Supply Rejection Ratio
Sense Input Common Mode Rejection
en
REFRR
RREF
VREF
VREFR
Differential Input Referred Noise Voltage Density
REF Pin Rejection, V+ = 5.5V
ΔΔΔVVVRRREEEFFF
=
=
=
2.75V
3.25V
3.25V
REF Pin Input Impedance
Open Circuit Voltage
REF Pin Input Range (Note 9)
ISHDN
VIH
VIL
f3dB
Pin Pull-Up Current
SHDN Pin Input High
SHDN Pin Input Low
Small Signal Bandwidth
SR Slew Rate
tS Settling Time Due to Input Step, ΔVOUT = ±2V
LT1999-10
LT1999-20
LT1999-50
ΔVOUT = ±2V
VCM > 5.5V
VVCSMHD=N
–5V
= 0.5V,
0V
<
VCM
<
80V
VVCCMM
>
=
5.5V
–5V
VSHDN = 0.5V, 0V < VCM < 80V
V+ = 4.5V to 5.5V
VVCCMM
=
=
–5V
–5V
to
to
80V
5.5V
VCM = 12V, 7VP-P, f = 100kHz,
VCM = 0V, 7VP-P, f = 100kHz
f= 10kHz
f = 0.1Hz to 10Hz
LT1999-10
LT1999-20
LT1999-50
VSHDN = 0.5V
VSHDN = 0.5V
LT1999-10
LT1999-20
LT1999-50
V+ = 5.5V, VSHDN = 0V
LT1999-10
LT1999-20
LT1999-50
0.5% Settling
l –5
l 6.4
8
l5
l 3.6
20
4.8
–750
l –2000
±500
8
l 9.95
l 19.9
l 49.75
10
20
50
l –0.5
±0.2
l 100 137.5
l –2.35 –1.95
l 0.001
l –1
l –10
l –10
l 68
77
l 96
l 96
l 75
l 80
105
120
90
100
97
8
80
9.6
6
750
2000
10.05
20.1
50.25
0.5
180
–1.5
10
1
10
10
V
kΩ
MΩ
kΩ
μV
μV
μV/°C
V/V
V/V
V/V
%
μA
mA
μA
μA
μA
μA
dB
dB
dB
dB
dB
nV/√Hz
μVP-P
l 62
l 62
l 62
l 60
l 0.15
l 2.45
l 0.25
l 1.5
l 1.125
l 1.125
l –6
l V+ – 0.5
l
70
70
70
80 100
0.4 0.65
2.5 2.55
2.5 2.75
V+ – 1.25
V+ – 1.125
V+ – 1.125
–2
0.5
2
2
1.2
3
2.5
dB
dB
dB
kΩ
MΩ
V
V
V
V
V
μA
V
V
MHz
MHz
MHz
V/μs
μs
For more information www.linear.com/LT1999
1999fd
5
5 Page 
LT1999-10/LT1999-20/
LT1999-50
Typical Performance Characteristics
LT1999 Input Referred Noise
Density vs Frequency
1000
100
10
0.001 0.01
0.1 1 10
FREQUENCY (kHz)
1000 10000
1999 G31
Short-Circuit Current
vs Temperature
40
30 SINKING
20
10
0
–10
–20
SOURCING
–30
–40
–55 –30
–5 20 45 70 95
TEMPERATURE (°C)
120 145
1999 G32
REF Open Circuit Voltage
vs Temperature
3.0
2.5 ACTIVE MODE
SHDN MODE
2.0
1.5
1.0
0.5
V+ = 5V
0
–55 –30 –5 20 45 70 95
TEMPERATURE (°C)
120 145
1999 G33
SHDN Pin Current vs SHDN Pin
Voltage and Temperature
0 V+ = 5V
VCM = 12V
–1
TA = 150°C
–2 TA = 25°C
TA = –55°C
–3
–4
012345
VSHDN (V)
1999 G34
Turn-On/Turn-Off Time
vs SHDN Voltage
VCM = 12V
IS
SHUTDOWN
VSHDN
TIME (1µs/DIV)
1999 G35
VOUT vs VSENSE
6
VREF = 2.5V
5
4
3
2
1
0
–1
–0.25
–0.15
–0.05 0.05
VSENSE (V)
LT1999-10
LT1999-20
LT1999-50
0.15 0.25
1999 G36
VOUT vs VSENSE Over the Sense
ABSMAX Range
6
VOUT PHASE REVERSAL FOR VSENSE < –25V
5
4
3
2
1
0
VREF = 2.5V
–1
–60 –30
0
VSENSE (V)
LT1999-10
LT1999-20
LT1999-50
30 60
1999 G37
For more information www.linear.com/LT1999
1999fd
11
11 Page | ||
| Páginas | Total 26 Páginas | |
| PDF Descargar | [ Datasheet LT1999-20.PDF ] | |
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