Other Parts Discussed in Thread: LM5146
Hi TI team,
I’m using the LM5146 synchronous buck controller to step down 85 V max (72 V nominal) input to a 48 V nominal / 68 V max output at 10 A load current.
I calculated the component values using both the datasheet design equations and the TI Quick-Start Calculator.
I’m now trying to simulate the circuit in Altium Designer’s SPICE simulator, but the simulation fails immediately — the status just shows “simulation failed,” and no waveform or error message appears in the console.
What I’ve tried:
- Verified all controller pins are connected per the reference design.
- Added small series resistance to the input source, inductor, and capacitors (for convergence).
- Tried short transient runs (e.g. .tran 0 2ms 0 100n).
Even with these changes, Altium reports “simulation failed” with no further information.
Questions:
- Is the LM5146 SPICE model fully compatible with Altium Designer’s SPICE engine?
- Are there any required connections or hidden pins (e.g., for internal supplies or compensation) that must be explicitly tied for simulation?
We would appreciate your help in verifying our design to ensure it functions as expected. Any feedback or recommendations would be appreciated.
Please find the attached documents.
Thank you,
Yashaswini M N
