Current Sense Amplifiers

 

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Current Sense Amplifiers

Main types

Hall effect current sensor — higher ampere ranges

Shunt current sensors — lower ampere ranges

Applications

Motor drives

• H bridge motor feedback control, speed and torque control
• 3 phase motor feedback control, speed and torque control

Load Current limiting applications

Solenoids

Led driver — brightness control applications

Special characteristics

• Higher voltage CMV - Common mode voltage
• High CMRR - Common-mode rejection ratio
• Common mode Pwm rejection - Mesure current in PWM signals

Common parameters

• Bandwidth
• Supply voltage
• Gain setting
• Gain bandwidth
• Input noise
• CMRR

High side current sense

Low side current sense

Isolated current sense 

Bidirectional current sense