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LM34936EVM: Converter operation (LM34936EVM) at 24V, 8A output

Sayan Das
Prodigy 40 points
Part Number: LM34936EVM
Other Parts Discussed in Thread: LM5176

Tool/software:

To configure the LM34936EVM converter for 12 V input and 24 V output at 8 A load current, some modifications were made to the board: the sense resistor (R10) was changed from 8 mΩ to 4 mΩ, R14 was adjusted to 20 kΩ, and R19 to 560 kΩ to modify the voltage divider accordingly. Under these conditions, the converter draws 0.09 A even at no load. However, when the load current exceeds 6.5 A, the input current fluctuates around 0.7 A and fails to stabilize. How can this issue be resolved? 

If further changes to the schematic are required to resolve this issue, what components should be adjusted and what would be their recommended values?

Thanks !

  • 0
    TI__Intellectual 1140 points

    Hi Sayan,
    Could you please attach the filled out     LM5176 Design Calculator to this thread? And please help attach waveform for SW/Vout/Iout/Vin for the instability you are seeing now. Please give us some time to look into this. 

    Besides, do you have other buck-boost application need? If only 12v to 24v/8A is needed, you could use a boost instead of buck-boost controller as LM5176. Thanks.