JAJSV63A August 2024 – August 2024 LM5137-Q1
ADVANCE INFORMATION
Figure 8-15 shows the schematic diagram of a single-output, two-phase synchronous buck regulator with an output voltage of 5V and rated load current of 20A. In this example, the target half-load and full-load efficiencies are 93% and 91%, respectively, based on a nominal input voltage of 12V that ranges from 6V to 36V. The switching frequency is set at 2.1MHz by resistor RRT. The 5V output supplies bias current to the controller to improve light-load efficiency. An output voltage of 3.3V is also possible simply by changing the voltage-set resistor (RFB tied from FB1 to VDDA) from 24.9kΩ to 7.5kΩ.