Simulation Setup
Last modified by Microchip on 2025/01/27 10:06
MIC28515 Schematic
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MIC28515 75 V, 5 A Evaluation Board
Solid, Stable Design with Large VOUT Ripple
Unstable Design with Small VOUT Ripple
Substituting a large value inductor into the design for illustrative purposes, with nothing else changed, has the effect of dramatically reducing the inductor ripple, and in turn, the feedback ripple amplitude. The result is insufficient feedback ripple for a stable design.
Stable Design with Small Vout Ripple w/ CFF
Unstable Design w/ Low ESR COUT
Stable Design w/ Low ESR and Ripple Injection
Despite the inductance value of 8.2 μH, the Vout ripple remains very low. The addition of Rinj, CB > VFB ~108 mV results in a stable design.