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Original question:
Hi!
Question about CC mode implementation
Concept for Constant Current mode:
ISNS+ and ISNS- is used to achieve current feedback control
ISNS- voltage is controlled by PWM signal.
ISNS+ voltage comes from current shunt IC. Current shunt is bidirectional so output value Vout = VDDA/2 + (Current * 45mV/A)
For instance if VDDA = 3.3v
0A - 1.65
1A - 1.695
2A - 1.74 ...etc
LM34936RHFR measures drop across ISNS(+) and ISNS(-) to provide CC mode.
So idea is to change voltage on ISNS(-) pin to obtain controlled CC value
Attached circuit shows this approach.
What do you think about it?
Can it provoke unwanted oscillations over feedback loop?
Maybe some RC filter needs to be added to ISNS pins?
