Simulation Setup

Last modified by Microchip on 2025/01/27 10:06

MIC28515 Schematic

MIC28515 Schematic

Microchip's MPLAB® Analog Designer tools help speed up the design process. Proprietary models of Microchip's power and analog products are available, enabling AC, DC, and transient analysis.

MIC28515 75 V, 5 A Evaluation Board

MIC28515 75V, 5A Evaluation Board

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Solid, Stable Design with Large VOUT Ripple

Solid, Stable Design with Large Vout Ripple

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Unstable Design with Small 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.

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Stable Design with Small Vout Ripple w/ CFF

Stable Design with Small Vout Ripple w/ CFF

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Unstable Design w/ Low ESR COUT

Unstable Design w/ Low ESR COUT

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Stable Design w/ Low ESR and Ripple Injection

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.

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Stable Design w/ Low ESR and Ripple Injection (2)

Stable Design w/ Low ESR and Ripple Injection (2)

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