INA240_17 Datasheet, PDF (1/36 Pages) Texas Instruments – INA240 High- and Low-Side, Bidirectional, Zero-Drift, Current-Sense Amplifier with Enhanced PWM Rejection

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INA240
SBOS662A – JULY 2016 – REVISED OCTOBER 2016
INA240 High- and Low-Side, Bidirectional, Zero-Drift, Current-Sense Amplifier with
Enhanced PWM Rejection
1 Features
•1 Enhanced PWM Rejection
• Excellent CMRR:
– 132-dB DC CMRR
– 93-dB AC CMRR at 50 kHz
• Wide Common-Mode Range: –4 V to 80 V
• Accuracy:
– Gain:
– Gain Error: 0.20% (max)
– Gain Drift: 2.5 ppm/°C (max)
– Offset:
– Offset Voltage: ±25 μV (max)
– Offset Drift: 250 nV/°C (max)
• Available Gains:
– INA240A1: 20 V/V
– INA240A2: 50 V/V
– INA240A3: 100 V/V
– INA240A4: 200 V/V
• Quiescent Current: 2.4 mA (max)
2 Applications
• Motor Controls
• Solenoid and Valve Controls
• Power Management
• Actuator Controls
• Pressure Regulators
• Telecom Equipment
3 Description
The INA240 is a voltage-output, current-sense
amplifier with enhanced PWM rejection that can
sense drops across shunt resistors over a wide
common-mode voltage range from –4 V to 80 V,
independent of the supply voltage. The negative
common-mode voltage allows the device to operate
below ground, accommodating the flyback period of
typical solenoid applications. Enhanced PWM
rejection provides high levels of suppression for large
common-mode transients (ΔV/Δt) in systems that use
pulse width modulation (PWM) signals (such as motor
drives and solenoid control systems). This feature
allows for accurate current measurements without
large transients and associated recovery ripple on the
output voltage.
This device operates from a single 2.7-V to 5.5-V
power supply, drawing a maximum of 2.4 mA of
supply current. Four fixed gains are available: 20 V/V,
50 V/V, 100 V/V, and 200 V/V. The low offset of the
zero-drift architecture enables current sensing with
maximum drops across the shunt as low as 10-mV
full-scale. All versions are specified over the extended
operating temperature range (–40°C to +125°C), and
are offered in an 8-pin TSSOP package.
Device Information⁽¹⁾
PART NUMBER
PACKAGE
BODY SIZE (NOM)
INA240
TSSOP (8)
3.00 mm × 4.40 mm
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
Typical Application
Supply
(2.7 V to 5.5 V)
IN±
+
OUT
IN+
REF2
REF1
Enhanced PWM Rejection
227700
Y2140
240
221100
180
115800
150
120
90
60
30
0
-30
3.5
3
2.5
2
1.5
Common-Mode Step
INA240 OUT
1
0.5
Time (2 µs/div)
03.50
Y1
-0.53
2.5
-1 ₂
-11.5.5
D004
1
An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,
intellectual property matters and other important disclaimers. PRODUCTION DATA.