INA180A3IDBVR Detailed explanation of pin function specifications and circuit principle instructions

The INA180A3IDBVR is a current sense amplifier manufactured by Texas Instruments (TI). It is part of the INA180 series, which is designed for measuring current in low-voltage and high-side applications. Below is a detailed explanation of the pin functions, specifications, circuit principles, and FAQs in response to your request.

Pin Function Specifications and Circuit Principle

1. Package and Pinout

The INA180A3IDBVR is available in an 8-pin VSSOP (Very Small Shrink Outline Package), with the following pinout configuration:

Pin No. Pin Name Pin Function Description 1 V+ Positive power supply input (from 2.7V to 5.5V) 2 IN+ Non-inverting input of the current sense amplifier. Input from the system under measurement. 3 IN– Inverting input of the current sense amplifier. Common reference for the current measurement. 4 GND Ground reference pin for the device. 5 VOUT Output voltage pin, which reflects the amplified differential voltage across the shunt resistor. 6 SENSE Sense resistor input for measuring the voltage drop across the shunt resistor (optional in some configurations). 7 ALERT Open-drain output used for alert purposes (optional feature). Used to signal when current exceeds a set threshold. 8 V– Negative power supply (typically GND in a single-supply configuration). 2. Principle of Operation

The INA180A3IDBVR is a current-sensing amplifier used for detecting low currents in systems, especially for high-side current sensing. The differential voltage between IN+ and IN– pins corresponds to the voltage drop across the shunt resistor, which is then amplified and output on VOUT. The device is powered by a voltage between V+ and V–.

The VOUT pin is the output signal that is proportional to the sensed current through the shunt resistor. VOUT can be read using an ADC (Analog-to-Digital Converter), or it can be compared to threshold voltages for triggering actions, such as activating the ALERT pin when a current limit is exceeded.

Pin Function Table

Pin No. Pin Name Pin Function Description 1 V+ Positive power supply input for the INA180A3IDBVR, typically between 2.7V and 5.5V. 2 IN+ Non-inverting input for the current sense amplifier. Typically connected to the current source. 3 IN– Inverting input for the current sense amplifier. Used for measuring the voltage across the current sensing element. 4 GND Ground reference pin for the device. Should be connected to the system ground. 5 VOUT Output voltage that represents the amplified differential voltage between IN+ and IN–. 6 SENSE Sense resistor input for measuring the voltage drop across a shunt resistor, if used in the design. 7 ALERT Open-drain alert output that can be configured for indicating when current exceeds the threshold. 8 V– Negative power supply or system ground in single-supply applications.

FAQ – 20 Common Questions About INA180A3IDBVR

**What is the function of the **INA180A3IDBVR? The INA180A3IDBVR is a current sense amplifier designed to measure the current flowing through a shunt resistor, typically used in low-voltage, high-side current sensing applications. What is the maximum supply voltage for the INA180A3IDBVR? The maximum supply voltage for the INA180A3IDBVR is 5.5V. Can the INA180A3IDBVR measure negative currents? No, the INA180A3IDBVR is designed for high-side current sensing and does not measure negative currents. It only provides a voltage output proportional to positive currents. What is the output voltage range of the INA180A3IDBVR? The output voltage range of the INA180A3IDBVR is from 0V to V+, depending on the current being sensed. **What is the significance of the *ALERT* pin in the INA180A3IDBVR?** The ALERT pin is an open-drain output that signals when the current exceeds a user-defined threshold. It can be used to trigger an external system action, such as cutting off power or triggering an alarm. What is the shunt resistor used for in the INA180A3IDBVR circuit? The shunt resistor is placed in series with the load to develop a small voltage drop that is proportional to the current flowing through it. This voltage drop is then amplified by the INA180A3IDBVR. What is the typical voltage gain of the INA180A3IDBVR? The typical voltage gain of the INA180A3IDBVR is 50 (in the default configuration). How does the INA180A3IDBVR differ from other current sense amplifiers? The INA180A3IDBVR offers high accuracy, low offset voltage, and is designed for high-side current sensing, unlike many amplifiers which are designed for low-side sensing. What is the operating temperature range for the INA180A3IDBVR? The INA180A3IDBVR operates within the temperature range of -40°C to 125°C.

Can the INA180A3IDBVR be used in automotive applications?

Yes, the INA180A3IDBVR is suitable for automotive applications, as it meets the industrial operating temperature range.

What is the typical quiescent current of the INA180A3IDBVR?

The typical quiescent current of the INA180A3IDBVR is 15µA.

Can the INA180A3IDBVR be used in single-supply applications?

Yes, the INA180A3IDBVR can be powered with a single supply voltage, with the V– pin typically connected to ground.

What is the recommended input voltage for the INA180A3IDBVR?

The recommended input voltage at the IN+ and IN– pins should be within the range of 0V to V+.

What happens if the input voltage exceeds the supply voltage?

If the input voltage exceeds the supply voltage, the INA180A3IDBVR could be damaged or malfunction. It is essential to ensure that the inputs are within the supply voltage limits.

What is the gain error specification for the INA180A3IDBVR?

The gain error for the INA180A3IDBVR is typically 0.2%, providing high accuracy for current measurements.

**Can the *ALERT* pin be used in a power-saving mode?**

Yes, the ALERT pin can be used to trigger power-saving actions, such as turning off power to a load when the current exceeds a threshold.

What is the output impedance of the INA180A3IDBVR?

The output impedance of the INA180A3IDBVR is low, ensuring minimal voltage drop and efficient signal transmission to external measurement devices.

What is the accuracy of the INA180A3IDBVR at low currents?

The INA180A3IDBVR is designed for high accuracy, with low offset and high precision even at low current levels.

How does the INA180A3IDBVR handle over-voltage conditions?

The INA180A3IDBVR has internal protection against over-voltage conditions, ensuring that the device can tolerate brief over-voltage situations without permanent damage.

Is the INA180A3IDBVR suitable for high-speed measurements?

Yes, the INA180A3IDBVR is capable of providing fast response times, making it suitable for high-speed current measurements in dynamic systems.

This summary provides a detailed analysis of the INA180A3IDBVR device, its pin functions, operational principles, and common FAQs in a structured format. If you need more specific details or additional clarifications, feel free to ask!