Buck Converter Transient Simulation
Thought for 17 mins 31 sec
Done — I reran the full 0 to 5 ms transient for U4.
Result summary
Table
| Metric | Result |
|---|---|
| Startup to 90% of 3.3 V | 283.75 µs |
| Startup to 99% of 3.3 V | 494.50 µs |
| Peak startup voltage | 3.2956 V |
| Startup overshoot above 3.3 V | 0.0 mV |
| Pre-step average VOUT | 3.2961 V |
| Minimum VOUT after 2 ms load step | 2.8787 V |
| Peak undershoot below 3.3 V | 421.3 mV |
| Maximum rebound after step | 3.5786 V |
| Peak overshoot above 3.3 V after step | 278.6 mV |
| Post-step settled average VOUT | 3.2607 V |
| Settled within ±1% of final post-step value by | 2.4655 ms |
- Startup ramp: monotonic rise, reaching regulation in about 0.5 ms
- Load step at 2 ms: significant droop, then rebound above nominal before settling
- Transient behavior: this condition looks fairly aggressive for the requested 100 mA → 1 A step
You should see these in the Files section:
rt8059_full_0_5ms.pngrt8059_startup_zoom.pngrt8059_load_step_zoom.pngrt8059_equiv_buck_transient.csvrt8059_metrics.txt
I could not use a vendor SPICE macro-model for U4, so this run used a datasheet-equivalent closed-loop buck model. That means the startup and load-step waveforms are useful for engineering guidance, but the exact overshoot/undershoot numbers should be treated as approximate rather than silicon-accurate.
If you want, I can next:
- tune the equivalent model for a more realistic response, or
- extract ripple / inductor current details from the generated CSV.
Extract ripple metrics
Tune transient model
Check compensation parts
