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Hi team
LM2576T-adj In IC, when the output current load is over 2A, there is a problem that the voltage can not be changed when changing the feedback resistor.
We would like to use the output of LM2576-adj by varying from 8V to 11.2V,
When the output current is about 1.5 A, the voltage variable control is performed as desired,
If the current load is more than 2A, there is a problem that the voltage variable control can not be performed.
- Input voltage: 13V
- Output voltage: 11.2V
- Output current: 2.3A
The issue might be drop-out.
Try increasing your input voltage to 15v or so, and see if the
problem goes away.
Also, check if the design is oscillating.