Part Number: LM3488
Tool/software: TINA-TI or Spice Models
I am trying simulate the LM3488 in a boost configuration with VIN supplied from another source. The input voltage is 1.3 VDC with the output voltage set to 4VDC. The simulation works fine if I don't load the output. As soon as a load is applied the output drops to near 0 volts and the MOSFET gate drive stays high. There is also a large (and not unexpected) increase in the MOSFET current. It's at this point that the LM3488 stops driving the MOSFET. Schematic and simulation results attached.2480.SCHEMATIC1 _ PAGE1.pdf
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In reply to Dean Munson:
In reply to Youhao Xi:
7776.boost.pdfMore or less same result except the MOSFET gate drive goes to 0 volts.
Tried increasing output cap to 1000uF but the LM3488 stops switching 2mS into the simulation.
Sorry for the slow response. Was out of town.
I did increase the sense resistor as suggested but as I stated in my last post the result was the same except that the peak current was reduced and after the device stopped switching the gate drive pin went to 0 volts.
Zip File attached
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