Other Parts Discussed in Thread: LM46000PWPEVM,
1. We are trying to meet RE102 Ground emissions spec with a LM46000-Q1 switching regulator. Noticed a blank part location between SW and GND on the LM46000PWPEVM evaluation board. Using a 0.012uF capacitor between SW and GND, the regulator (and product) passed the RE102 specification.
Questions: Is this an acceptable design modification? How can such a capacitor affect regulator performance negatively? We noticed heat with a 0.022uF capacitor, and no noticeable heat with 0.012uF cap.
Details: 5V, 100mA output. 6-40V input. Cap would be 100V device.
2. Using WEBENCH to simulate LM46000-Q1 configurations.
Questions: What are the potential problems of running 20-35 degree phase margin? What instability can occur? How can instability affect circuit operation?