Datasheet

5V Evaluation Board

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Figure 9 shows a typical startup of the LM5045 into a 2V pre-biased load. Trace 2 represents the output

current that is monitored between the output caps of the power converter and the 2V pre-bias voltage

supply. It can be inferred from the Trace 2 that the SR MOSFET's do not sink any current during the

power-up into pre-biased load.

Conditions: Input Voltage = 48V, Output Pre-Bias = 2V

Trace 1 (Channel 4): Output Voltage Volts/div = 1V

Trace 2 (Channel 2): Output Current Amps/div = 200mA

Trace 3 (Channel 3): SR Gate Voltage Volts/div = 5V

Figure 9. Soft-Start into 2V Pre-Biased Load

11 5V Evaluation Board

The LM5045 evaluation board can be easily modified to achieve a 5V output at 30A load. The 5V board

schematic and the Bill of Materials (BOM) change required to achieve it are shown below. A peak

efficiency of 93% was observed at 48V input and 5V out at 30A.

AN-2111 LM5045 Evaluation Board SNVA468C–February 2011–Revised May 2013

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