an-1052| Application Note
Application Note AN-1052
Using the IR217x Linear Current Sensing ICs By Jonathan Adams
1. Basic Functionality.......................................................................... 1 2. Bootstrap Circuit ............................................................................. 1 3. Retrieving Analog Current Signal at the Output ............................. 2 3.1 Passive Filters .............................................................................. 2 3.2 Active Filters ................................................................................. 3 4. Interfacing the Output With Digital Circuits..................................... 3 4.1 Hardware Interfacing .................................................................... 3 4.2 Software for Decoding the PWM Signal ....................................... 4 5. Dealing With Negative Transients at the VS Pin ............................ 4 6. Layout Recommendations.............................................................. 4 7. Dv/Dt And Its Effect On Duty Cycle ................................................ 5 8. Comparis
on of the IR2170/1/2/5..................................................... 6
Linear current sensing ICs are designed to transfer current sense information from the high-side motor drive circuit to the low-side circuit, so that the information may be processed by ground referenced control circuits. The Analog input signal is actually a voltage which comes from the voltage drop across an external sensing resistor.
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