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Número de pieza | INA207 | |
Descripción | High-Side Measurement Current-Shunt Monitor | |
Fabricantes | Burr-Brown | |
Logotipo | ||
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I NA20x
INA20x
IN A20x
INA206
INA207
INA208
SBOS360 − JULY 2006
High-Side Measurement
Current-Shunt Monitor with Dual Comparators
FEATURES
D COMPLETE CURRENT SENSE SOLUTION
D DUAL COMPARATORS:
− Comparator 1 with Latch
− Comparator 2 with Optional Delay
D COMMON-MODE RANGE: −16V to +80V
D HIGH ACCURACY: 3.5% (max) OVER TEMP
D BANDWIDTH: 500kHz
D QUIESCENT CURRENT: 1.8mA
D PACKAGES: SO-14, TSSOP-14, MSOP-10
APPLICATIONS
D NOTEBOOK COMPUTERS
D CELL PHONES
D TELECOM EQUIPMENT
D AUTOMOTIVE
D POWER MANAGEMENT
D BATTERY CHARGERS
D WELDING EQUIPMENT
DESCRIPTION
The INA206, INA207, and INA208 are a family of
high-side, current-shunt monitors with voltage output, dual
comparators, and voltage reference. The INA206,
INA207, and INA208 can sense drops across shunts at
common-mode voltages from −16V to +80V. The INA206,
INA207, and INA208 are available with three output
voltage scales: 20V/V, 50V/V, and 100V/V, with up to
500kHz bandwidth.
The INA206, INA207, and INA208 also incorporate two
open-drain comparators with internal 0.6V references. On
14-pin versions, the comparator references can be
overridden by external inputs. Comparator 1 includes a
latching capability, and Comparator 2 has a
user-programmable delay on 14-pin versions. 14-pin
versions also provide a 1.2V reference output.
The INA206, INA207, and INA208 operate from a single
+2.7V to +18V supply. They are specified over the
extended operating temperature range of −40°C to
+125°C.
INA206− INA208
VS 1
OUT 2
CMP1 IN+ 3
CMP2 IN− 4
GND 5
0.6V REF
MSOP−10
10 VIN+
9 VIN−
8 CMP1 OUT
7 CMP2 OUT
6 CMP1 RESET
VS 1
OUT 2
CMP1 IN−/0.6V REF 3
CMP1 IN+ 4
CMP2 IN− 5
CMP2 IN+/0.6V REF 6
GND 7
INA206− INA208
1.2V REF
14 VIN+
13 VIN−
12 1.2V REF OUT
11 CMP1 OUT
10 CMP2 OUT
9 CMP2 DELAY
8 CMP1 RESET
SO−14, TSSOP−14
DEVICE
INA206
INA207
INA208
GAIN
20V/V
50V/V
100V/V
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas Instruments
semiconductor products and disclaimers thereto appears at the end of this data sheet.
All trademarks are the property of their respective owners.
PRODUCTION DATA information is current as of publication date. Products
conform to specifications per the terms of Texas Instruments standard warranty.
Production processing does not necessarily include testing of all parameters.
Copyright 2006, Texas Instruments Incorporated
www.ti.com
1 page www.ti.com
INA206
INA207
INA208
SBOS360 − JULY 2006
ELECTRICAL CHARACTERISTICS
Boldface limits apply over the specified temperature range, TA = −40°C to +125°C.
At TA = +25°C, VS = +12V, VIN+ = 12V, VSENSE = 100mV, RL = 10kΩ to GND, and RPULL-UP = 5.1kΩ each connected from CMP1 OUT and
CMP2 OUT to VS, unless otherwise noted.
INA206, INA207, INA208
REFERENCE PARAMETERS
REFERENCE VOLTAGE
1.2VREFOUT Output Voltage
Reference Drift
dVOUT/dT
0.6VREF Output Voltage
(Pins 3 and 6 of 14-pin packages only)
Reference Drift
LOAD REGULATION
Sourcing
dVOUT/dT
dVOUT/dILOAD
Sinking
LOAD CURRENT
LINE REGULATION
CAPACITIVE LOAD
ILOAD
dVOUT/dVS
Reference Output Max. Capacitive Load
CONDITIONS
TA = −40°C to +85°C
TA = −40°C to +85°C
0mA < ISOURCE < 0.5mA
0mA < ISINK < 0.5mA
2.7V < VS < 18V
No Sustained Oscillations
MIN
1.188
TYP
1.2
40
0.6
40
0.4
0.4
1
30
10
MAX
1.212
100
100
2
UNIT
V
ppm/°C
V
ppm/°C
mV/mA
mV/mA
mA
µV/V
nF
OUTPUT IMPEDANCE
Pins 3 and 6 of 14-Pin Packages Only
10 kΩ
ELECTRICAL CHARACTERISTICS
Boldface limits apply over the specified temperature range, TA = −40°C to +125°C.
At TA = +25°C, VS = +12V, VIN+ = 12V, VSENSE = 100mV, RL = 10kΩ to GND, RPULL-UP = 5.1kΩ each connected from CMP1 OUT and
CMP2 OUT to VS, and CMP1 IN+ = 1V and CMP2 IN− = GND, unless otherwise noted.
INA206, INA207, INA208
GENERAL PARAMETERS
CONDITIONS
MIN TYP
MAX
UNIT
POWER SUPPLY
Operating Power Supply
Quiescent Current
over Temperature
VS
IQ
Comparator Power-On Reset Threshold(1)
VOUT = 2V
VSENSE = 0mV
+2.7
1.8
1.5
+18 V
2.2 mA
2.8 mA
V
TEMPERATURE
Specified Temperature Range
Operating Temperature Range
Storage Temperature Range
Thermal Resistance
MSOP-10 Surface-Mount
SO-14, TSSOP-14 Surface-Mount
qJA
−40
−55
−65
200
150
+125
+150
+150
°C
°C
°C
°C/W
°C/W
(1) The INA206, INA207, and INA208 are designed to power-up with the comparator in a defined reset state as long as CMP1 RESET is open or
grounded. The comparator will be in reset as long as the power supply is below the voltage shown here. The comparator will assume a state
based on the comparator input above this supply voltage. If CMP1 RESET is high at power-up, the comparator output comes up high and
requires a reset to assume a low state, if appropriate.
5
5 Page www.ti.com
APPLICATIONS INFORMATION
BASIC CONNECTION
Figure 2 shows the basic connection of the INA206,
INA207, and INA208. The input pins, VIN+ and VIN−, should
be connected as closely as possible to the shunt resistor
to minimize any resistance in series with the shunt
resistance.
Power-supply bypass capacitors are required for stability.
Applications with noisy or high impedance power supplies
may require additional decoupling capacitors to reject
power-supply noise. Connect bypass capacitors close to
the device pins.
POWER SUPPLY
The input circuitry of the INA206, INA207, and INA208 can
accurately measure beyond the power-supply voltage, V+.
For example, the V+ power supply can be 5V, whereas the
load power-supply voltage is up to +80V. The output
voltage range of the OUT terminal, however, is limited by
the voltages on the power-supply pin.
ACCURACY VARIATIONS AS A RESULT OF
VSENSE AND COMMON-MODE VOLTAGE
The accuracy of the INA206, INA207, and INA208 current
shunt monitors is a function of two main variables: VSENSE
(VIN+ − VIN−) and common-mode voltage, VCM, relative to
the supply voltage, VS. VCM is expressed as (VIN+ + VIN−)/2;
however, in practice, VCM is seen as the voltage at VIN+
because the voltage drop across VSENSE is usually small.
INA206
INA207
INA208
SBOS360 − JULY 2006
This section addresses the accuracy of these specific
operating regions:
Normal Case 1: VSENSE ≥ 20mV, VCM ≥ VS
Normal Case 2: VSENSE ≥ 20mV, VCM < VS
Low VSENSE Case 1: VSENSE < 20mV, −16V ≤ VCM < 0
Low VSENSE Case 2: VSENSE < 20mV, 0V ≤ VCM ≤ VS
Low VSENSE Case 3: VSENSE < 20mV, VS < VCM ≤ 80V
Normal Case 1: VSENSE ≥ 20mV, VCM ≥ VS
This region of operation provides the highest accuracy.
Here, the input offset voltage is characterized and
measured using a two-step method. First, the gain is
determined by Equation (1).
G
+
VOUT1 * VOUT2
100mV * 20mV
(1)
where:
VOUT1 = Output Voltage with VSENSE = 100mV
VOUT2 = Output Voltage with VSENSE = 20mV
Then the offset voltage is measured at VSENSE = 100mV
and referred to the input (RTI) of the current shunt monitor,
as shown in Equation (2).
ǒ ǓVOSRTI (Referred−To−Input) +
V OUT1
G
* 100mV
(2)
In the Typical Characteristics, the Output Error vs
Common-Mode Voltage curve shows the highest
accuracy for the this region of operation. In this plot,
VS = 12V; for VCM ≥ 12V, the output error is at its minimum.
This case is also used to create the VSENSE ≥ 20mV output
specifications in the Electrical Characteristics table.
Load Supply
−18V to +80V
Current Shunt
Monitor Output
CBYPASS
0.01µF
VS
OUT
CMP1 IN−/0.6 REF
CMP1 IN+
CMP2 IN−
CMP2 IN+/0.6 REF
GND
RSHUNT
3mΩ
INA206
x20
1.2V REF
VIN+
VIN−
1.2V REF OUT
CMP1 OUT
CMP2 OUT
CMP2 DELAY
CMP1 RESET
RPULL−UP
4.7kΩ
RPULL−UP
4.7kΩ
Optional Delay
Capacitor
0.2µF/s
Transparent/Reset
Latch
Load
5V Supply
Figure 2. INA20x Basic Connection
11
11 Page |
Páginas | Total 23 Páginas | |
PDF Descargar | [ Datasheet INA207.PDF ] |
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