Overview
The INA240A1PWR from Texas Instruments is a high-performance, bidirectional current-sense amplifier designed for precision current measurement across a wide range of common-mode voltages. This device is particularly suited for applications requiring accurate current sensing in the presence of high common-mode transients, such as those found in motor control, solenoid drive, and switching power supplies. The INA240A1PWR features enhanced pulse width modulation (PWM) rejection, zero-drift topology, and excellent common-mode rejection ratio (CMRR), making it an ideal choice for demanding current measurement tasks.
Key Specifications
| Parameter | Value |
|---|---|
| Common-Mode Range | -4 V to 80 V |
| DC CMRR | 132 dB |
| AC CMRR at 50 kHz | 93 dB |
| Gain | 20 V/V (INA240A1) |
| Supply Voltage | Up to 5.5 V |
| Package | 8-Pin TSSOP |
| Bandwidth | Defined by -3-dB bandwidth of the current-sense amplifier |
Key Features
- Enhanced PWM Rejection: Reduces the effect of common-mode transients associated with PWM signals, ensuring accurate current measurements in applications like motor or solenoid drive and switching power supplies.
- Zero-Drift Topology: Provides high accuracy and stability over time.
- Excellent CMRR: Offers 132 dB DC CMRR and 93 dB AC CMRR at 50 kHz, ensuring minimal interference from common-mode signals.
- Wide Common-Mode Range: Operates from -4 V to 80 V, making it versatile for various applications.
- Multiple Gain Versions: Allows for optimization of the desired full-scale output voltage based on the target current range expected in the application.
Applications
- Motor Control: Ideal for current sensing in motor drive circuits, especially those involving PWM signals.
- Solenoid Drive: Suitable for applications requiring precise current measurement in solenoid control systems.
- Switching Power Supplies: Used in power supply designs where accurate current monitoring is crucial.
- Industrial Automation: Applicable in various industrial automation scenarios where reliable current sensing is necessary.
Q & A
- What is the common-mode range of the INA240A1PWR?
The common-mode range of the INA240A1PWR is from -4 V to 80 V. - What is the DC CMRR of the INA240A1PWR?
The DC CMRR of the INA240A1PWR is 132 dB. - How does the INA240A1PWR handle PWM signals?
The INA240A1PWR features enhanced PWM rejection, which reduces the effect of common-mode transients associated with PWM signals. - What is the gain of the INA240A1PWR?
The gain of the INA240A1PWR is 20 V/V. - What is the package type of the INA240A1PWR?
The INA240A1PWR comes in an 8-Pin TSSOP package. - What are the typical applications of the INA240A1PWR?
The INA240A1PWR is typically used in motor control, solenoid drive, switching power supplies, and industrial automation. - How does the zero-drift topology benefit the INA240A1PWR?
The zero-drift topology provides high accuracy and stability over time, ensuring reliable current measurements. - What is the bandwidth of the INA240A1PWR?
The bandwidth is defined by the -3-dB bandwidth of the current-sense amplifier. - Can the INA240A1PWR be used in automotive applications?
Yes, there is an automotive-qualified version of the INA240, denoted as INA240-Q1. - How is the output midpoint adjusted in the INA240A1PWR?
The output midpoint can be adjusted using the reference pins, which can be connected to ground, supply, or an external precision reference.
