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7Semi INA240 4-80V Bidirectional Current Sensor Amplifier Breakout Board

7Semi INA240 4-80V Bidirectional Current Sensor Amplifier Breakout Board

₹619.00Price
🔹 Overview
The 7Semi INA240 Breakout Board is a precision current-sense amplifier module based on the Texas Instruments INA240 IC.
It is designed for accurate bidirectional current measurement in systems with high voltage and noisy switching signals (like PWM motor drives).
🔹 Working Principle
  • Measures voltage drop across an external shunt resistor
  • Uses a high-precision differential amplifier
  • Converts small shunt voltage → amplified analog output voltage
  • Output is proportional to current (both directions)
👉 Supports:
  • Forward current
  • Reverse current (charging/discharging systems)
🔹 Core Electrical Characteristics
  • Common-mode voltage range: –4V to +80V
  • Supply voltage: 2.7V – 5.5V
  • Quiescent current: ~2.4 mA
  • Operating temperature: –40°C to +125°C
👉 Can measure current even in high-side configurations (on supply line)
🔹 Gain Variants (Important)
Different versions of INA240 provide fixed gain:
  • 20 V/V (INA240A1)
  • 50 V/V (INA240A2)
  • 100 V/V (INA240A3)
  • 200 V/V (INA240A4)
👉 Gain determines:
  • Sensitivity
  • Measurement range
🔹 Key Technical Features
✔ Wide Voltage Capability
  • Works from –4V to 80V common-mode
  • Handles below-ground transients
✔ Bidirectional Sensing
  • Detects:
    • Charging current
    • Discharging current
✔ High Accuracy
  • Zero-drift architecture → low offset error
  • Can detect very small shunt voltages (~10 mV)
✔ High Noise Immunity
  • PWM rejection technology
  • Stable output even in:
    • Motor drivers
    • Switching power supplies
✔ High CMRR
  • ~132 dB (DC) → excellent noise rejection
🔹 Output Characteristics
  • Type: Analog voltage output
  • Output equation (concept):
    Vout = Gain × (Vshunt)
  • Can be read using:
    • Microcontroller ADC
    • Analog measurement systems
🔹 Functional Capabilities
  • High-side current sensing
  • Low-side current sensing
  • Fast response for dynamic loads
  • Suitable for high-frequency switching systems
🔹 Internal Architecture
  • Precision differential amplifier
  • Zero-drift offset correction
  • High-speed analog signal path
  • PWM transient rejection circuitry
🔹 Performance Characteristics
  • Fast response time → suitable for real-time control
  • High bandwidth → handles switching signals
  • Stable output without ripple (PWM systems)
🔹 Key Technical Advantages
  • Works in noisy electrical environments
  • Measures both directions of current
  • High accuracy even at low current levels
  • Supports wide voltage systems (up to 80V)
🔹 Limitations
  • Requires external shunt resistor
  • Output is analog (needs ADC for digital systems)
  • Accuracy depends on:
    • Shunt resistor quality
    • PCB layout
🔹 Technical Summary
This module is a high-precision analog current sensing solution, ideal for:
  • High-voltage systems
  • PWM-based applications
  • Real-time current monitoring
👉 Compared to simple sensors (like ACS712), it provides:
  • Much higher accuracy
  • Better noise rejection
  • Faster response
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