Overview
The INA240A3PW is a high-performance, current-sense amplifier manufactured by Texas Instruments. This device is part of the INA240 series, known for its wide common-mode range, precision, and zero-drift topology. The INA240A3PW is specifically designed to handle large common-mode transients and offers enhanced pulse width modulation (PWM) rejection, making it ideal for applications involving PWM signals such as motor drives and solenoid control systems.
The amplifier operates from a single 2.7-V to 5.5-V power supply and is available in an 8-pin TSSOP package. It features multiple fixed gains (20 V/V, 50 V/V, 100 V/V, and 200 V/V), with the INA240A3PW having a gain of 100 V/V. This device is highly accurate, with a gain error of 0.2% and an input offset voltage of ±25 μV, ensuring precise current measurements.
Key Specifications
| Parameter | Value |
|---|---|
| Bandwidth | 400 kHz |
| CMRR (Min) | 120 dB |
| Common Mode Voltage (Max) | 80 V |
| Common Mode Voltage (Min) | -4 V |
| Gain | 100 V/V (INA240A3PW) |
| Gain Error | 0.2% |
| Gain Error Drift (Max) | 10 ppm/°C |
| Input Offset (+/-) (Max) | 25 μV |
| Input Offset Drift (+/-) (Typ) | 0.05 μV/°C |
| Iq (Max) | 2.6 mA |
| Operating Temperature Range | -40°C to 125°C |
| PSRR (Typ) | 1 μV/V |
| Package Type | 8-pin TSSOP |
| Supply Voltage (Max) | 5.5 V |
| Supply Voltage (Min) | 2.7 V |
Key Features
- Enhanced PWM Rejection: Reduces the effect of large common-mode transients associated with PWM signals, ensuring accurate current measurements.
- Wide Common-Mode Range: Operates over a wide common-mode voltage range from -4 V to 80 V, independent of the supply voltage.
- Zero-Drift Topology: Offers high accuracy with low input offset voltage (±25 μV) and low offset drift (0.05 μV/°C).
- Multiple Fixed Gains: Available in gains of 20 V/V, 50 V/V, 100 V/V, and 200 V/V, allowing for optimization based on the target current range.
- Low Quiescent Current: Draws a maximum of 2.4 mA of supply current.
- High CMRR: Excellent common-mode rejection ratio (CMRR) of up to 132 dB DC and 93 dB AC at 50 kHz.
- Compact Packaging: Available in an 8-pin TSSOP package.
Applications
- Motor Controls: Ideal for motor drive systems that use PWM signals.
- Solenoid and Valve Controls: Suitable for solenoid applications, including those with flyback periods below ground.
- Power Management: Used in power management systems requiring precise current sensing.
- Actuator Controls: Applicable in actuator control systems where accurate current measurement is crucial.
- Pressure Regulators: Can be used in pressure regulation systems that require high precision.
- Telecom Equipment: Suitable for telecom equipment that requires reliable and accurate current sensing.
Q & A
- What is the operating temperature range of the INA240A3PW?
The operating temperature range is -40°C to 125°C.
- What is the gain of the INA240A3PW?
The gain of the INA240A3PW is 100 V/V.
- What is the common-mode voltage range of the INA240A3PW?
The common-mode voltage range is from -4 V to 80 V.
- What is the maximum supply voltage for the INA240A3PW?
The maximum supply voltage is 5.5 V.
- What is the typical quiescent current of the INA240A3PW?
The typical quiescent current is 2.4 mA.
- What is the bandwidth of the INA240A3PW?
The bandwidth is 400 kHz.
- What is the CMRR of the INA240A3PW?
The CMRR is up to 132 dB DC and 93 dB AC at 50 kHz.
- What package type is the INA240A3PW available in?
The INA240A3PW is available in an 8-pin TSSOP package.
- What are some typical applications of the INA240A3PW?
Typical applications include motor controls, solenoid and valve controls, power management, actuator controls, pressure regulators, and telecom equipment.
- Does the INA240A3PW have enhanced PWM rejection?
Yes, the INA240A3PW features enhanced PWM rejection to reduce the effect of large common-mode transients associated with PWM signals.
