|
|
PDF LTC6101HV Data sheet ( Hoja de datos )
| Número de pieza | LTC6101HV | |
| Descripción | High-Side Current Sense Amplifier | |
| Fabricantes | Linear Technology | |
| Logotipo |  |
|
Hay una vista previa y un enlace de descarga de LTC6101HV (archivo pdf) en la parte inferior de esta página. Total 20 Páginas | ||
|
No Preview Available !
www.DataSheet4U.com
LTC6101/LTC6101HV
High Voltage,
High-Side Current Sense
Amplifier in SOT-23
FEATURES
■ Supply Range:
5V to 100V, 105V Absolute Maximum (LTC6101HV)
4V to 60V, 70V Absolute Maximum (LTC6101)
■ Low Offset Voltage: 300µV Max
■ Fast Response: 1µs Response Time (0V to 2.5V on
a 5V Output Step)
■ Gain Configurable with 2 Resistors
■ Low Input Bias Current: 170nA Max
■ PSRR: 110dB Min
4V to 60V (LTC6101)
5V to 100V (LTC6101HV)
■ Output Current: 1mA Max
■ Low Supply Current: 250µA, VS = 14V
■ Low Profile (1mm) SOT-23 (ThinSOTTM) Package
U
APPLICATIO S
■ Current Shunt Measurement
■ Battery Monitoring
■ Remote Sensing
■ Power Management
, LTC and LT are registered trademarks of Linear Technology Corporation.
ThinSOT is a trademark of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
DESCRIPTIO
The LTC®6101/LTC6101HV are versatile, high voltage, high
side current sense amplifiers. Design flexibility is provided
by the excellent device characteristics; 300µV Max offset
and only 375µA (typical at 60V) of current consumption.
The LTC6101 operates on supplies from 4V to 60V and
LTC6101HV operates on supplies from 5V to 100V.
The LTC6101 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 trans-
lated into a ground referenced signal. Low DC offset allows
the use of a small shunt resistor and large gain-setting
resistors. As a result, power loss in the shunt is reduced.
The wide operating supply range and high accuracy make
the LTC6101 ideal for a large array of applications from
automotive to industrial and power management. A maxi-
mum input sense voltage of 500mV allows a wide range of
currents to be monitored. The fast response makes the
LTC6101 the perfect choice for load current warnings and
shutoff protection control. With very low supply current,
the LTC6101 is suitable for power sensitive applications.
The LTC6101 is available in 5-lead SOT-23 and 8-lead
MSOP packages.
TYPICAL APPLICATIO
16-Bit Resolution Unidirectional Output into LTC2433 ADC
ILOAD
–VSENSE +
RIN
100Ω
5V TO 105V
43
L
O
2
+–
5
A
D
5V 1µF
LTC6101HV
1 VOUT
ROUT
4.99k
LTC2433-1
TO µP
VOUT
=
ROUT
RIN
•
VSENSE
=
49.9VSENSE
6101 TA01
Step Response
VSENSE–
∆VSENSE– = 100mV
5.5V
5V
VOUT
0.5V
0V
TA = 25°C
V+ = 12V
RIN = 100
ROUT = 5k
VSENSE+ = V+
IOUT = 100µA
IOUT = 0
500ns/DIV
6101 TA01b
6101fa
1
1 page  
LTC6101/LTC6101HV
ELECTRICAL CHARACTERISTICS
Note 1: Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.
Note 2: The LTC6101C/LTC6101HVC are guaranteed to meet specified
performance from 0°C to 70°C. The LTC6101C/LTC6101HVC are designed,
characterized and expected to meet specified performance from – 40°C to
85°C but are not tested or QA sampled at these temperatures. LTC6101I/
LTC6101HVI are guaranteed to meet specified performance from – 40°C to
85°C. The LTC6101H/LTC6101HVH are guaranteed to meet specified
performance from – 40°C to 125°C.
TYPICAL PERFOR A CE CHARACTERISTICS
Input VOS vs Temperature
800 REPRESENTATIVE
600 UNITS
400
200
0
– 200
– 400
– 600
– 800
– 1000
–40 –20
A GRADE
B GRADE
C GRADE
RIN = 100
ROUT = 5k
VIN = 5mV
0 20 40 60 80 100 120
TEMPERATURE (°C)
6101 G01
LTC6101: VOUT Maximum vs
Temperature
12
VS = 60V
10
VS = 12V
8
6
VS = 6V
4
VS = 4V
2
0
–40 –20
0 20 40 60 80
TEMPERATURE (°C)
100 120
6101 G06
Input VOS vs Supply Voltage
40
20
TA = 0°C
0
–20 TA = –40°C
–40 TA = 45°C
–60
–80
–100
–120
RIN = 100
ROUT = 5k
VIN = 5mV
–140
4 11 18
25 32 39
VSUPPLY (V)
TA = 85°C
TA = 125°C
46 53 60
6101 G02
LTC6101HV: VOUT Maximum vs
Temperature
12
VS = 100V
10
VS = 12V
8
6 VS = 6V
VS = 5V
4 VS = 4V
2
0
–40 –20
0 20 40 60 80
TEMPERATURE (°C)
100 120
6101 G20
Input Sense Range
2.5
TA = 25°C
TA = 0°C
2
1.5
1 TA = 85°C
TA = –40°C
TA = 70°C
TA = 125°C
0.5
0
4 10
LTC6101
LTC6101HV
20 30 40 50 60 70
VSUPPLY (V)
RIN = 3k
ROUT = 3k
80 90 100
6101 G05
LTC6101: IOUT Maximum vs
Temperature
7
6 VS = 12V
5 VS = 60V
4
3 VS = 6V
2
VS = 4V
1
0
–40 –20
0 20 40 60 80
TEMPERATURE (°C)
100 120
6101 G07
6101fa
5
5 Page 
LTC6101/LTC6101HV
APPLICATIO S I FOR ATIO
Selection of External Output Resistor, ROUT
The output resistor, ROUT, determines how the output
current is converted to voltage. VOUT is simply IOUT • ROUT.
In choosing an output resistor, the max output voltage
must first be considered. If the circuit that is driven by the
output does not limit the output voltage, then ROUT must
be chosen such that the max output voltage does not
exceed the LTC6101 max output voltage rating. If the
following circuit is a buffer or ADC with limited input range,
then ROUT must be chosen so that IOUT(MAX) • ROUT is less
than the allowed maximum input range of this circuit.
In addition, the output impedance is determined by ROUT.
If the circuit to be driven has high enough input imped-
ance, then almost any useful output impedance will be
acceptable. However, if the driven circuit has relatively low
input impedance, or draws spikes of current, such as an
ADC might do, then a lower ROUT value may be required in
order to preserve the accuracy of the output. As an
example, if the input impedance of the driven circuit is 100
times ROUT, then the accuracy of VOUT will be reduced by
1% since:
VOUT
= IOUT
• ROUT •RIN(DRIVEN)
ROUT + RIN(DRIVEN)
=
IOUT
• ROUT
•
100
101
=
0.99 •IOUT
• ROUT
Error Sources
The current sense system uses an amplifier and resistors
to apply gain and level shift the result. The output is then
dependent on the characteristics of the amplifier, such as
gain and input offset, as well as resistor matching.
Ideally, the circuit output is:
VOUT
=
VSENSE
• ROUT
RIN
;VSENSE
=
RSENSE
• ISENSE
In this case, the only error is due to resistor mismatch,
which provides an error in gain only. However, offset
voltage, bias current and finite gain in the amplifier cause
additional errors:
Output Error, EOUT, Due to the Amplifier DC Offset
Voltage, VOS
EOUT(VOS) = VOS • (ROUT/RIN)
The DC offset voltage of the amplifier adds directly to the
value of the sense voltage, VSENSE. This is the dominant
error of the system and it limits the available dynamic
range. The paragraph “Selection of External Current Sense
Resistor” provides details.
Output Error, EOUT, Due to the Bias Currents,
IB(+) and IB(–)
The bias current IB(+) flows into the positive input of the
internal op amp. IB(–) flows into the negative input.
EOUT(IBIAS) = ROUT((IB(+) • (RSENSE/RIN) – IB(–))
Since IB(+) ≈ IB(–) = IBIAS, if RSENSE << RIN then,
EOUT(IBIAS) ≈ –ROUT • IBIAS
For instance if IBIAS is 100nA and ROUT is 1kΩ, the output
error is 0.1mV.
Note that in applications where RSENSE ≈ RIN, IB(+) causes
a voltage offset in RSENSE that cancels the error due to
IB(–) and EOUT(IBIAS) ≈ 0. In applications where RSENSE <
RIN, the bias current error can be similarly reduced if an
external resistor RIN(+) = (RIN – RSENSE) is connected as
shown in Figure 4 below. Under both conditions:
EOUT(IBIAS) = ± ROUT • IOS; IOS = IB(+) – IB(–)
V+
RIN–
RSENSE
RIN+ 4
LOAD
2
+–
3
5
LTC6101
1
VOUT
ROUT
RIN+ = RIN– – RSENSE
6101 F04
Figure 4. Second Input R Minimizes
Error Due to Input Bias Current
6101fa
11
11 Page | ||
| Páginas | Total 20 Páginas | |
| PDF Descargar | [ Datasheet LTC6101HV.PDF ] | |
Hoja de datos destacado
| Número de pieza | Descripción | Fabricantes |
| LTC6101HV | High-Side Current Sense Amplifier | Linear Technology |
| Número de pieza | Descripción | Fabricantes |
| SLA6805M | High Voltage 3 phase Motor Driver IC. |
 Sanken |
| SDC1742 | 12- and 14-Bit Hybrid Synchro / Resolver-to-Digital Converters. |
 Analog Devices |
|
DataSheet.es es una pagina web que funciona como un repositorio de manuales o hoja de datos de muchos de los productos más populares, |
| DataSheet.es | 2020 | Privacy Policy | Contacto | Buscar |