Voltage and current measurements at input/output of the device are taken, to measure input/output power respectively and calculate the efficiency of the boost converter. The device is operated in configurations 'Resistor' and 'Analog', with an input voltage of 14.4V and a load ranging from 0.1A to 5A. Figure 4-1 shows the efficiency plot of the two configurations.

Figure 4-1 Efficiency Plot for V_OUT = 24V and V_OUT = 48V

In configuration resistors, the efficiency gets up to 95.16% at 5A load current, while in configuration analog, the efficiency goes up to 92.95% at 5A load current. As expected, the converter loses between 2% and 3% in efficiency with respect to synchronous operation (according to the EVM specification mentioned in Table 1-1 of LM5125EVM-BST Evaluation Module), due to the diode having higher conduction losses than the transistor. Higher output voltage means higher duty cycle for the low-side FET, which adds more switching loss to the total converter losses, and as a result, the efficiency is lower for configuration analog (V_OUT = 48V).