SNVS480J January 2007 – July 2020 LM5022
The most common circuit controlled by the LM5022 is a non-isolated boost regulator. The boost regulator steps up the input voltage and has a duty ratio D in Equation 2.
The following is a design procedure for selecting all the components for the boost converter circuit shown in Figure 14. The application is in-cabin automotive, meaning that the operating ambient temperature ranges from –20°C to 85°C. This circuit operates in continuous conduction mode (CCM), where inductor current stays above 0 A at all times, and delivers an output voltage of 40 V ±2% at a maximum output current of 0.5 A. Additionally, the regulator must be able to handle a load transient of up to 0.5 A while keeping VO within ±4%. The voltage input comes from the battery or alternator system of an automobile, where the standard range of 9 V to 16 V and transients of up to 32 V must not cause any malfunction.