INA254中文資料德州儀器數(shù)據(jù)手冊PDF規(guī)格書

1 Features

? Precision integrated 400-μΩ shunt resistor

– Continuous ±75 A at 25°C

– Continuous ±50 A from –40°C to +85°C

– Shunt resistor tolerance: 0.5 (maximum)

– Low drift: 10 ppm/°C (0°C to 125°C)

– Low inductance: 2 nH

? High accuracy

– System gain error: 0.5 (maximum)

– System gain drift: 45 ppm/°C (maximum)

– Input offset current: ±62.5 mA (maximum)

– Input offset drift: 625 μA/°C (maximum)

– DC CMRR > 120-dB

– 90-dB AC CMRR at 50 kHz

? Enhanced PWM rejection

? Wide common-mode range: –4 V to +80 V

? Available gains: 20 mV/A, 40 mV/A,

and 75 mV/A

2 Applications

? 48-V motor controls

? DC/DC converters

? Medical cordless tools

? Solenoid and actuators

? Remote I/O link control

3 Description

The INA254 is a voltage-output, current sense

amplifier with a 400-μΩ integrated shunt resistor. The

INA254 is designed to monitor bidirectional currents

over a wide common-mode range from –4 V to +80 V,

independent of the supply voltage. Three fixed gains

are available: 20 mV/A, 40 mV/A, and 75 mV/A.

The integration of the precision resistor with a zerodrift

chopped amplifier provides calibration equivalent

measurement accuracy, ultra-low temperature drift

performance of ±45 ppm/°C (maximum), and an

optimized Kelvin layout for the sensing resistor.

The INA254 is designed with enhanced PWM

rejection circuitry to suppress large (dv/dt) signals that

enable real-time continuous current measurements.

The measurements are critical for in-line current

measurements in a motor-drive application, and for

solenoid valve control applications.

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. All gain versions are specified over

the extended operating temperature range (–40°C

to +125°C), and are available in a 24-pin HTSSOP

package.