LMP8640MKE-H [NSC]
Precision High Voltage Current Sense Amplifier; 精密高电压电流检测放大器
| 型号： | LMP8640MKE-H |
| 厂家： | 
National Semiconductor |
| 描述： | Precision High Voltage Current Sense Amplifier |
| 文件： | 总16页 (文件大小：1094K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
September 7, 2010
LMP8640/LMP8640HV
Precision High Voltage Current Sense Amplifier
General Description
Features
The LMP8640 and the LMP8640HV are precision current
sense amplifiers that detect small differential voltages across
a sense resistor in the presence of high input common mode
voltages with a supply voltage range from 2.7V to 12V.
Typical values, TA = 25°C
High common-mode voltage range
■
LMP8640
LMP8640HV
-2V to 42V
-2V to 76V
2.7V to 12V
—
—
The LMP8640 accepts input signals with common mode volt-
age range from -2V to 42V, while the LMP8640HV accepts
input signal with common mode voltage range from -2V to
76V. The LMP8640 and LMP8640HV have fixed gain for ap-
plications that demand accuracy over temperature. The
LMP8640 and LMP8640HV come out with three different
fixed gains 20V/V, 50V/V, 100V/V ensuring a gain accuracy
as low as 0.25%. The output is buffered in order to provide
low output impedance. This high side current sense amplifier
is ideal for sensing and monitoring currents in DC or battery
powered systems, excellent AC and DC specifications over
temperature, and keeps errors in the current sense loop to a
minimum. The LMP8640 and LMP8640HV are ideal choice
for industrial, automotive and consumer applications, and it is
available in TSOT-6 package.
Supply voltage range
Gain options
■
■
■
■
■
■
■
■
■
20V/V; 50V/V; 100V/V
0.25%
Max gain error
Low offset voltage
Input bias current
PSRR
CMRR (2.1V to 42V)
Temperature range
6-Pin TSOT Package
900µV
13 μA
85 dB
103 dB
-40°C to 125°C
Applications
High-side current sense
■
■
■
■
■
■
Vehicle current measurement
Motor controls
Battery monitoring
Remote sensing
Power management
Typical Application
30071462
LMP™ is a trademark of National Semiconductor Corporation.
© 2010 National Semiconductor Corporation
300714
www.national.com
LMP8640
Voltage at VOUT pin
-6V to 60V
V- to V+
Absolute Maximum Ratings (Note 1)
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
Storage Temperature Range
Junction Temperature (Note 3)
For soldering specifications,
see product folder at www.national.com and
www.national.com/ms/MS/MS-SOLDERING.pdf
-65°C to 150°C
150°C
ESD Tolerance (Note 2)
Human Body Model
For input pins +IN, -IN
For all other pins
Machine Model
Charge device model
Supply Voltage (VS = V+ - V−)
Differential Voltage +IN- (-IN)
Voltage at pins +IN, -IN
LMP8640HV
5000V
2000V
200V
1250V
13.2V
6V
Operating Ratings (Note 1)
Supply Voltage (VS = V+ - V−)
Temperature Range (Note 3)
Package Thermal Resistance(Note 3)
TSOT-6
2.7V to 12V
-40°C to 125°C
96°C/W
-6V to 80V
2.7V Electrical Characteristics (Note 4)
Unless otherwise specified, all limits guaranteed for at TA = 25°C, VS=V+ – V-, VSENSE= +IN-(-IN), V+ = 2.7V, V− = 0V, −2V < VCM
< 76V, RL = 10MΩ. Boldface limits apply at the temperature extremes.
Min
Typ
Max
Symbol
Parameter
Condition
Units
(Note 6) (Note 5) (Note 6)
VOS
Input Offset Voltage
VCM = 2.1V
VCM = 2.1V
VCM = 2.1V
f > 10 kHz
-900
-1160
900
1160
µV
TCVOS
IB
Input Offset Voltage Drift
(Note 7, Note 9)
2.6
μV/°C
μA
Input Bias Current (Note 10)
12
20
27
eni
Input Voltage Noise (Note 9)
117
20
nV/
V/V
Gain AV Fixed Gain LMP8640-T
LMP8640HV-T
Fixed Gain LMP8640-F
LMP8640HV-F
50
V/V
V/V
Fixed Gain LMP8640-H
LMP8640HV-H
100
Gain error
VCM = 2.1V
-0.25
0.25
%
-0.51
0.51
Accuracy over temperature
(Note 9)
−40°C to 125°C, VCM=2.1V
VCM = 2.1V, 2.7V < V+ < 12V,
26.2
ppm/°C
dB
PSRR
CMRR
Power Supply Rejection Ratio
Common Mode Rejection Ratio
85
LMP8640HV 2.1V < VCM < 42V
LMP8640 2.1V < VCM< 42V
103
dB
LMP8640HV 2.1V < VCM < 76V
-2V <VCM < 2V,
95
60
BW
Fixed Gain LMP8640-T
LMP8640HV-T (Note 9)
DC VSENSE = 67.5 mV,
CL = 30 pF,RL= 1MΩ
DC VSENSE =27 mV,
CL = 30 pF, RL= 1MΩ
DC VSENSE = 13.5 mV,
CL = 30 pF ,RL= 1MΩ
950
450
230
1.4
Fixed Gain LMP8640-F
LMP8640HV-F (Note 9)
kHz
Fixed Gain LMP8640-H
LMP8640HV-H (Note 9)
SR
Slew Rate (Note 8, Note 9)
V/µs
VCM =5V, CL = 30 pF, RL = 1MΩ,
LMP8640-T LMP8640HV-T VSENSE =100mVpp,
LMP8640-F LMP8640HV-F VSENSE =40mVpp,
LMP8640-H LMP8640HV-H VSENSE =20mVpp,
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2
Min
Typ
Max
Symbol
Parameter
Condition
Units
(Note 6) (Note 5) (Note 6)
RIN
Differential Mode Input Impedance
(Note 9)
5
kΩ
IS
Supply Current
VCM = 2.1V
VCM = −2V
VCM = 2.1V
420
600
800
µA
V
2000
2500
2750
VOUT
Maximum Output Voltage
Minimum Output Voltage
2.65
LMP8640-T LMP8640HV-T
VCM = 2.1V
18.2
40
LMP8640-F LMP8640HV-F
VCM = 2.1V
mV
pF
LMP8640-H LMP8640HV-H
VCM = 2.1V
80
CLOAD
Max Output Capacitance Load
30
(Note 9)
5V Electrical Characteristics (Note 4)
Unless otherwise specified, all limits guaranteed for at TA = 25°C, VS=V+ – V-, VSENSE= +IN-(-IN), V+ = 5V, V− = 0V, −2V < VCM
<
76V, RL = 10MΩ. Boldface limits apply at the temperature extremes.
Min
Typ
Max
Symbol
Parameter
Condition
Units
(Note 6) (Note 5) (Note 6)
VOS
Input Offset Voltage
VCM = 2.1V
VCM = 2.1V
VCM = 2.1V
f > 10 kHz
-900
-1160
900
1160
µV
TCVOS
IB
Input Offset Voltage Drift
(Note 7, Note 9)
2.6
μV/°C
μA
Input Bias Current (Note 10)
13
21
28
eni
Input Voltage Noise (Note 9)
117
20
nV/
V/V
Gain AV Fixed Gain LMP8640-T
LMP8640HV-T
Fixed Gain LMP8640-F
LMP8640HV-F
50
V/V
V/V
Fixed Gain LMP8640-H
LMP8640HV-H
100
Gain error
VCM = 2.1V
-0.25
0.25
%
-0.51
0.51
Accuracy over temperature
(Note 9)
−40°C to 125°C, VCM=2.1V
VCM = 2.1V, 2.7V < V+ < 12V,
26.2
ppm/°C
dB
PSRR
CMRR
Power Supply Rejection Ratio
Common Mode Rejection Ratio
85
LMP8640HV 2.1V < VCM < 42V
LMP8640 2.1V < VCM< 42V
103
dB
LMP8640HV 2.1V < VCM < 76V
-2V <VCM < 2V,
95
60
BW
Fixed Gain LMP8640-T
LMP8640HV-T (Note 9)
DC VSENSE = 67.5 mV,
CL = 30 pF ,RL= 1MΩ
DC VSENSE =27 mV,
950
450
230
Fixed Gain LMP8640-F
LMP8640HV-F(Note 9)
kHz
CL = 30 pF ,RL= 1MΩ
DC VSENSE = 13.5 mV,
CL = 30 pF ,RL= 1MΩ
Fixed Gain LMP8640-H
LMP8640HV-H(Note 9)
3
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Min
Typ
Max
Symbol
Parameter
Condition
Units
(Note 6) (Note 5) (Note 6)
SR
Slew Rate (Note 8, Note 9)
1.6
V/µs
VCM =5V, CL = 30 pF, RL = 1MΩ,
LMP8640-T LMP8640HV-T VSENSE =200mVpp,
LMP8640-F LMP8640HV-F VSENSE =80mVpp,
LMP8640-H LMP8640HV-H VSENSE =40mVpp,
RIN
IS
Differential Mode Input Impedance
(Note 9)
5
kΩ
Supply Current
VCM = 2.1V
VCM = −2V
VCM = 2.1V
500
722
922
µA
V
2050
2500
2750
Maximum Output Voltage
Minimum Output Voltage
4.95
LMP8640-T LMP8640HV-T
VCM = 2.1V
18.2
40
VOUT
LMP8640-F LMP8640HV-F
VCM = 2.1V
mV
pF
LMP8640-H LMP8640HV-H
VCM = 2.1V
80
CLOAD
Max Output Capacitance Load
30
(Note 9)
12V Electrical Characteristics (Note 4)
Unless otherwise specified, all limits guaranteed for at TA = 25°C, VS=V+ – V-, VSENSE= +IN-(-IN), V+ = 12V, V− = 0V, −2V < VCM
<
76V, RL = 10MΩ. Boldface limits apply at the temperature extremes.
Min
Typ
Max
Symbol
Parameter
Condition
Units
(Note 6) (Note 5) (Note 6)
VOS
Input Offset Voltage
VCM = 2.1V
VCM = 2.1V
VCM = 2.1V
f > 10 kHz
-900
-1160
900
1160
µV
TCVOS
IB
Input Offset Voltage Drift
(Note 7, Note 9)
2.6
μV/°C
μA
Input Bias Current (Note 10)
13
22
28
eni
Input Voltage Noise (Note 9)
117
20
nV/
V/V
Gain AV Fixed Gain LMP8640-T
LMP8640HV-T
Fixed Gain LMP8640-F
LMP8640HV-F
50
V/V
V/V
Fixed Gain LMP8640-H
LMP8640HV-H
100
Gain error
VCM = 2.1V
-0.25
0.25
%
-0.51
0.51
Accuracy over temperature
(Note 9)
−40°C to 125°C, VCM=2.1V
VCM = 2.1V, 2.7V < V+ < 12V,
26.2
ppm/°C
dB
PSRR
CMRR
Power Supply Rejection Ratio
Common Mode Rejection Ratio
85
LMP8640HV 2.1V < VCM < 42V
LMP8640 2.1V < VCM< 42V
103
dB
LMP8640HV 2.1V < VCM < 76V
-2V <VCM < 2V,
95
60
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4
Min
Typ
Max
Symbol
Parameter
Condition
DC VSENSE = 67.5 mV,
Units
(Note 6) (Note 5) (Note 6)
BW
Fixed Gain LMP8640-T
950
LMP8640HV-T (Note 9)
CL = 30 pF ,RL= 1MΩ
DC VSENSE =27 mV,
CL = 30 pF ,RL= 1MΩ
DC VSENSE = 13.5 mV,
CL = 30 pF ,RL= 1MΩ
Fixed Gain LMP8640-F
LMP8640HV-F (Note 9)
450
230
1.8
kHz
Fixed Gain LMP8640-H
LMP8640HV-H (Note 9)
SR
Slew Rate (Note 8, Note 9)
V/µs
VCM =5V, CL = 30 pF, RL = 1MΩ,
LMP8640-T LMP8640HV-T VSENSE =500mVpp,
LMP8640-F LMP8640HV-F VSENSE =200mVpp,
LMP8640-H LMP8640HV-H VSENSE =100mVpp,
RIN
IS
Differential Mode Input Impedance
(Note 9)
5
kΩ
Supply Current
VCM = 2.1V
VCM = −2V
VCM = 2.1V
720
1050
1250
µA
V
2300
2800
3000
VOUT
Maximum Output Voltage
Minimum Output Voltage
11.85
LMP8640-T LMP8640HV-T
VCM = 2.1V
18.2
40
LMP8640-F LMP8640HV-F
VCM = 2.1V
mV
pF
LMP8640-H LMP8640HV-H
VCM = 2.1V
80
CLOAD
Max Output Capacitance Load
30
(Note 9)
Note 1: “Absolute Maximum Ratings” indicate limits beyond which damage to the device may occur, including inoperability and degradation of device reliability
and/or performance. Functional operation of the device and/or non-degradation at the Absolute Maximum Ratings or other conditions beyond those indicated in
the Operating Ratings is not implied. Operating Ratings indicate conditions at which the device is functional and the device should not be operated beyond such
conditions.
Note 2: Human Body Model, applicable std. MIL-STD-883, Method 3015.7. Machine Model, applicable std. JESD22-A115-A (ESD MM std. of JEDEC) Field-
Induced Charge-Device Model, applicable std. JESD22-C101-C (ESD FICDM std. of JEDEC).
Note 3: The maximum power dissipation must be derated at elevated temperatures and is dictated by TJ(MAX), θJA, and the ambient temperature, TA. The maximum
allowable power dissipation PDMAX = (TJ(MAX) - TA)/ θJA or the number given in Absolute Maximum Ratings, whichever is lower.
Note 4: Electrical Table values apply only for factory testing conditions at the temperature indicated. Factory testing conditions result in very limited self-heating
of the device such that TJ = TA. No guarantee of parametric performance is indicated in the electrical tables under conditions of internal self-heating where TJ
>
TA. Absolute Maximum Ratings indicate junction temperature limits beyond which the device may be permanently degraded, either mechanically or electrically.
Note 5: Typical values represent the most likely parametric norm at the time of characterization. Actual typical values may vary over time and will also depend
on the application and configuration. The typical values are not tested and are not guaranteed on shipped production material.
Note 6: Limits are 100% production tested at 25°C. Limits over the operating temperature range are guaranteed through correlations using statistical quality
control (SQC) method.
Note 7: Offset voltage temperature drift is determined by dividing the change in VOS at the temperature extremes by the total temperature change.
Note 8: The number specified is the average of rising and falling slew rates and measured at 90% to 10%.
Note 9: This parameter is guaranteed by design and/or characterization and is not tested in production.
Note 10: Positive Bias Current corresponds to current flowing into the device.
5
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Block Diagram
30071430
Connection Diagram
6-Pin TSOT
30071402
Top View
Pin Descriptions
Pin
Name
VOUT
V-
Description
1
2
3
4
5
6
Single Ended Output
Negative Supply Voltage
Positive Input
+IN
-IN
Negative Input
NC
V+
Not Connected
Positive Supply Voltage
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6
Ordering Information
Package
Gain
Part Number
LMP8640MK-T
Package Marking
Transport Media
NSC Drawing
1k Units Tape and Reel
250 Units Tape and Reel
3k Units Tape and Reel
1k Units Tape and Reel
250 Units Tape and Reel
3k Units Tape and Reel
1k Units Tape and Reel
250 Units Tape and Reel
3k Units Tape and Reel
1k Units Tape and Reel
250 Units Tape and Reel
3k Units Tape and Reel
1k Units Tape and Reel
250 Units Tape and Reel
3k Units Tape and Reel
1k Units Tape and Reel
250 Units Tape and Reel
3k Units Tape and Reel
LMP8640MKE-T
LMP8640MKX-T
LMP8640HVMK-T
LMP8640HVMKE-T
LMP8640HVMKX-T
LMP8640MK-F
AA6A
6-Pin TSOT
20V/V
MK06A
AB6A
AC6A
AD6A
AE6A
AF6A
LMP8640MKE-F
LMP8640MKX-F
LMP8640HVMK-F
LMP8640HVMKE-F
LMP8640HVMKX-F
LMP8640MK-H
6-Pin TSOT
6-Pin TSOT
50V/V
MK06A
MK06A
LMP8640MKE-H
LMP8640MKX-H
LMP8640HVMK-H
LMP8640HVMKE-H
LMP8640HVMKX-H
100V/V
7
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Typical Performance Characteristics Unless otherwise specified: TA = 25°C, VS=V+-V-, VSENSE= +IN -
(-IN), RL = 10 MΩ.
Supply Curent vs. Supply Voltage
Supply Current vs. VCM
Supply Current vs. VCM
CMRR vs. VCM (Gain 50V/V)
30071425
30071426
Supply Current vs. VCM
30071427
30071428
CMRR vs. VCM (Gain 20V/V)
30071423
30071422
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8
CMRR vs. VCM (Gain 100V/V)
Output voltage vs. VSENSE
Large Step response
Gain vs. Frequency
30071424
30071414
Output voltage vs. VSENSE (ZOOM close to 0V)
30071416
30071417
Small Step response
30071418
30071419
9
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Settling time (fall)
Settling time (rise)
30071420
30071421
Common mode step response (rise)
Common mode step response (fall)
30071411
30071410
Load regulation (Sinking)
Load regulation (Sourcing)
30071432
30071431
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10
AC PSRR vs. Frequency
AC CMRR vs. Frequency
30071412
30071413
11
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gested. In this condition is required to take in account also the
power rating of RS resistor. The low input offset of the
LMP8640 allows the use of small sense resistors to reduce
power dissipation still providing a good input dynamic range.
The input dynamic range is the ratio expressed in dB between
the maximum signal that can be measured and the minimum
signal that can be detected, usually the input offset is the
principal limiting factor.
Application Information
GENERAL
The LMP8640 and LMP8640HV are single supply high side
current sense amplifiers with a fixed gain of 20V/V, 50V/V,
100V/V and a common mode voltage range of -2V to 42V or
-2V to 76V depending on the grade.
THEORY OF OPERATION
DRIVING ADC
As seen from the picture below, the current flowing through
RS develops a voltage drop equal to VSENSE across RS. The
high impedance inputs of the amplifier doesn’t conduct this
current and the high open loop gain of the sense amplifier
forces its non-inverting input to the same voltage as the in-
verting input. In this way the voltage drop across RIN matches
VSENSE. A current proportional to IS according to the following
relation:
The input stage of an Analog to Digital converter can be mod-
elled with a resistor and a capacitance versus ground. So if
the voltage source doesn't have a low impedance an error in
the amplitude's measurement will occur. In this case a buffer
is needed to drive the ADC. The LMP8640 has an internal
output buffer able to drive a capacitance load up to 30 pF or
the input stage of an ADC. If required an external low pass
RC filter can be added at the output of the LMP8640 to reduce
the noise and the bandwidth of the current sense.
IG = VSENSE/RIN = RS*IS/RIN
,
flows entirely in the internal gain resistor RG developing a
voltage drop equal to
VRG = IG *RG = (VSENSE/RIN) *RG = ((RS*IS)/RIN)*RG
This voltage is buffered and showed at the output with a very
low impedance allowing a very easy interface of the LMP8640
with other ICs (ADC, μC…).
VOUT = 2*(RS*IS)*G,
where G=RG/RIN = 10V/V, 25V/V, 50V/V, according to the
gain options.
30071461
FIGURE 2. LMP8640 to ADC interface
DESIGN EXAMPLE
For example in a current monitor application is required to
measure the current sunk by a load (peak current 10A) with
a resolution of 10mA and 0.5% of accuracy. The 10bit analog
to digital converter accepts a max input voltage of 4.1V. More-
over in order to not burn much power on the shunt resistor it
needs to be less than 10mΩ. In the table below are summa-
rized the other working condition.
Working Condition
Value
Max
30071403
Min
5V
FIGURE 1. Current monitor
Supply Voltage
Common mode Voltage
Temperature
5.5V
70V
48V
0°C
SELECTION OF THE SHUNT RESISTOR
70°C
50kHz
The value chosen for the shunt resistor, RS, depends on the
application. It plays a big role in a current sensing system and
must be chosen with care. The selection of the shunt resistor
needs to take in account the small-signal accuracy, the power
dissipated and the voltage loss across the shunt itself. In ap-
plications where a small current is sensed, a bigger value of
RS is selected to minimize the error in the proportional output
voltage. Higher resistor value improves the SNR at the input
of the current sense amplifier and hence gives an accurate
output. Similarly when high current is sensed, the power loss-
es in RS can be significant so a smaller value of RS is sug-
Signal BW
First step – LMP8640 / LMP8640HV selection
The required common mode voltage of the application implies
that the right choice is the LMP8640HV (High common mode
voltage up tp 76V).
Second step – Gain option selection
We can choose between three gain option (20V/V, 50V/V,
100V/V). considering the max input voltage of the ADC
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12
(4.1V) , the max Sense voltage across the shunt resistor is
evaluated according the following formula:
Accuracy Calculation
ERROR SOURCE
Tc Vos
Rs=4.1mΩ
182µV
Rs=8.1mΩ
182µV
VSENSE= (MAX Vin ADC) / Gain;
hence the max VSENSE will be 205mV, 82mV, 41mV respec-
tively. The shunt resistor are then evaluated considering the
maximum monitored current :
Nosie
216µV
216µV
Gain drift
75.2µV
151µV
RS = (max VSENSE) / I_MAX
Total error (squared sum of 293µV
contribution)
320µV
For each gain option the max shunt resistors are the follow-
ing : 20.5mΩ, 8.2mΩ, 4.1mΩ respectively.
Accuracy
100*(Max_VSENSE / Total
Error)
0.7%
0.4%
One of the project constraints requires RS<10mΩ, it means
that the 20.5mΩ will be discarded and hence the 50V/V and
100V/V gain options are still in play.
From the tables above is clear that the 8.2mΩ shunt resistor
allows the respect of the project's constraints. The power
burned on the Shunt is 820mW at 10A.
Third step – Shunt resistor selection
At this point an error budget calculation, considering the cal-
ibration of the Gain, Offset, CMRR, and PSRR, helps in the
selection of the shunt resistor. In the table below the contri-
bution of each error source is calculated considering the
values of the EC Table at 5V supply.
Resolution Calculation
ERROR SOURCE
Rs=4.1mΩ
Rs=8.1mΩ
CMRR calibrated ad mid
VCM range
77.9µV
77.9µV
PSRR calibrated at 5V
8.9µV
8.9µV
78µV
Total error (squared sum of 78µV
contribution)
Resolution
19.2mA
9.6mA
(Total error / RS)
13
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Physical Dimensions inches (millimeters) unless otherwise noted
TSOT-6
NS Package Number MK06A
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14
Notes
15
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