SNVA941A June 2020 – November 2022 LM5156 , LM5156-Q1 , LM51561 , LM51561-Q1 , LM51561H , LM51561H-Q1 , LM5156H , LM5156H-Q1
Selecting the switch current sense network components is described in the following section. Figure 3-1 shows the four components that make up the current sense network of the LM5156. RS is the current sense resistor. This resistor senses the switch current, and also sets the peak current limit of the inductor current. RF and CF form a low pass filter. This filter helps minimize high frequency noise on the current sense signal caused by the MOSFET turning on. RSL sets the external slope compensation and is optional. In some applications where the internal slope compensation is not large enough RSL will be required.