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INA790x –4V to 110V, Bidirectional, Ultra-Precise, Current Sense Amplifier With Enhanced PWM Rejection and 75A EZShunt Technology
SBOSAA6A
May 2024 – December 2024
INA790B
PRODUCTION DATA
CONTENTS
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INA790x –4V to 110V, Bidirectional, Ultra-Precise, Current Sense Amplifier With Enhanced PWM Rejection and 75A EZShunt Technology
1
1
Features
2
Applications
3
Description
4
Pin Configuration and Functions
5
Specifications
5.1
Absolute Maximum Ratings
5.2
ESD Ratings
5.3
Recommended Operating Conditions
5.4
Thermal Information
5.5
Electrical Characteristics
5.6
Typical Characteristics
6
Detailed Description
6.1
Overview
6.2
Functional Block Diagram
6.3
Feature Description
6.3.1
Integrated Shunt Resistor
6.3.2
Safe Operating Area
6.3.3
Short-Circuit Duration
6.3.4
Temperature Drift Correction
6.3.5
Enhanced PWM Rejection Operation
6.4
Device Functional Modes
6.4.1
Adjusting the Output With the Reference Pin
6.4.1.1
Reference Pin Connections for Unidirectional Current Measurements
6.4.1.2
Ground Referenced Output
6.4.1.3
Reference Pin Connections for Bidirectional Current Measurements
6.4.1.4
Output Set to Mid-Supply Voltage
6.4.2
Adjustable Gain Set Using External Resistors
6.4.2.1
Adjustable Unity Gain
6.4.3
Thermal Alert Function
7
Application and Implementation
7.1
Application Information
7.1.1
Calculating Total Error
7.1.1.1
Error Sources
7.1.1.2
Reference Voltage Rejection Ratio Error
7.1.1.3
External Adjustable Gain Error
7.1.1.4
Total Error Example 1
7.1.1.5
Total Error Example 2
7.1.1.6
Total Error Example 3
7.1.1.7
Total Error Curves
7.1.2
Signal Filtering
7.2
Typical Applications
7.2.1
High-Side, High-Drive, Solenoid Current-Sense Application
7.2.1.1
Design Requirements
7.2.1.2
Detailed Design Procedure
7.2.1.3
Application Curve
7.2.2
Speaker Enhancements and Diagnostics Using Current Sense Amplifier
7.2.2.1
Design Requirements
7.2.2.2
Detailed Design Procedure
7.2.2.3
Application Curve
7.3
Power Supply Recommendations
7.4
Layout
7.4.1
Layout Guidelines
7.4.2
Layout Example
8
Device and Documentation Support
8.1
Documentation Support
8.1.1
Related Documentation
8.2
Receiving Notification of Documentation Updates
8.3
Support Resources
8.4
Trademarks
8.5
Electrostatic Discharge Caution
8.6
Glossary
9
Revision History
10
Mechanical, Packaging, and Orderable Information
IMPORTANT NOTICE
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Data Sheet
INA790x
–4V to 110V, Bidirectional, Ultra-Precise, Current Sense Amplifier With
Enhanced PWM Rejection and
75A
EZShunt
Technology
1
Features
Precision solution with integrated shunt resistor
±75A continuous current at 25°C
±50A continuous current at +125°C
Shunt resistor: 400µΩ
Shunt inductance: 2nH
Wide common-mode voltage range: –4V to +110V
Enhanced PWM rejection optimized for systems subject to switching common-mode voltages
Supports switching frequencies up to 125kHz
Excellent CMRR
160dB DC CMRR
114dB AC CMRR at 50kHz
High measurement accuracy
System Gain error (maximum)
Version A: ±0.35%, ±35ppm/°C drift
Version B: ±1%, ±100ppm/°C drift
Offset current (maximum)
Version A: ±30mA, ±625µA/°C drift
Version B: ±250mA, ±1.25mA/°C drift
Adjustable gain with external resistor divider network:
20mV/A to 400mV/A
Open-drain temperature alert at T
J
of 160°C
Package options: VQFN-15
2
Applications
Motor drives
Solenoids and actuators
Injection molding machine
Cordless power tools
Medical cordless tools
Drone propeller speed control