SNVSBJ0A December 2019 – June 2020 LM5170
The LM5170 serves as a current regulator that regulates the DC component of the power inductor current to the value programmed at the ISETA pin. To regulate the output voltage, an outer voltage loop should be employed. The outer voltage loop can be implemented with an analog circuit (see Figure 53) or a digital circuit like an MCU (see Figure 54). The error voltage signal of the output voltage loop is the ISET command for the inner current loop.TI advises that the outer voltage loop crossover frequency should be one decade below that of the inner current loop crossover frequency fCO. Refer to the LM5170 Design Calculator for the loop compensation guidance.