Current Sense Amplifiers (2/2): Examples and Circuit with LT6105

Examples of current sense amplifiers and a live circuit with a LT6105 … ↓↓↓ Complete description, time index and links below ↓↓↓ In the first part (link below) I covered the drawbacks of using general purpose OpAmps as current sense amplifiers. This part starts with five examples of dedicated current sense amplifier and how they perform compared to OpAmps. Afterwards I design and build a current measurement circuit based on a LT6105 current sense amplifier. To my surprise the LT6105 worked as floating device, which it shouldn’t – if you have an idea, please leave a comment! Intro … 00:00 Intro – let’s get physical Examples … 01:32 TI INA181 – 50 cent for four 0.1% resistors in a chip 05:45 Maxim MAX9918 – amplification set through resistors 08:27 TI INA28x – 120dB CMRR with black magic 11:40 ST TSC103 – digitally selectable amplification 16:24 AD LT6105 – variable amplification and current output Design with a LT6105 … 18:57 Design parameters – what’s going in, what should get out 20:52 Output voltage – minimizing the error at zero 24:25 Output current – everything is current driven 27:23 Output resistance – just Ohm’s law 29:24 Resistor tolerances – values tweaked and pot added Live circuit with a LT6105 … 34:21 On breadboard – with soldered Kelvin connections 35:21 0mA – no low swing output error 36:05 100mA – spot on without tweaking the pot 37:38 400mA – full scale without a noticeable error 39:03 It was floating – and shouldn’t have worked, but it did 41:15 Common mode voltage – slight differences in the output Wrap-Up … 44:57 Wrap-Up – that’s all folks Current Sense Amplifiers (1/2): Why not to use an OpAmp (CMRR etc.):    • Video   My Third Attempt at SMD Soldering (Perfection with Hot Plate):    • My Third Attempt at SMD Soldering (Perfect...   Small Project: Constant Resistance 24V/100W AC/DC Electronic (*) Load – Part 1:    • Small Project: Constant Resistance 24V/100...   Small Project: Constant Resistance 24V/100W AC/DC Electronic (*) Load – Part 2:    • Small Project: Constant Resistance 24V/100...   Tutorials:    • Tutorials