SNVSBJ0A December 2019 – June 2020 LM5170
Each channel of the LM5170 has an independent gm error amplifier. The output of the error amplifier is connected to the COMP pin, allowing the loop compensation network to be applied between the COMP pins and AGND.
The LM5170 control loop is the inner current loop of the bidirectional converter system, of which the outer voltage loop can either be controlled by an MCU, a DSP, an FPGA, and so forth, or by an analog circuit. Because the LM5170 employs the averaged current mode control scheme, the inner loop is basically a first order system. As seen in Figure 25, a Type-II compensation network consisting of RCOMP, CCOMP, and CHF is adequate to stabilize the LM5170 inner current loop. Refer to the Application Information section for details of the compensation network selection criteria.