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Performance Characteristics

Conditions: Input Voltage = 48VDC

Output Current = 40A

Bandwidth Limit = 25MHz

Measured Ripple = 90mV pp

Trace 1: Output Ripple Voltage Volts/div = 50mV

Horizontal Resolution = 5µs/div

Figure 5. Output Ripple for a Load of 40A.

Figure 6 shows typical waveforms seen at the buck stage switching node at the input to L2 inductor, trace

3. It also shows the typical waveforms at the push-pull terminals of the main transformer, traces 1 and 2.

The input voltage was 60VDC and the load current was 20.0A.

Figure 7 and Figure 8 show the typical waveforms seen when measuring the drain-source voltage and

current of the push-pull MOSFETS. The upper two traces are the drain-source voltages and the lower two

traces are the corresponding drain-source currents. The input voltage was 48VDC and the load current

was 20.0A. Figure 8 is identical to Figure 7 except for the expanded time scale. The current waveforms

show the characteristic ramp imparted by the buck stage which is responsible for regulation of the output

voltage.

Trace 1: Push-pull at transformer,Side A, load = 20.0A Volts/div = 20.0V

Trace 2: Push-pull at transformer,Side B, load = 20.0A Volts/div = 20.0V

Trace 3: Buck Stage Switching Node, Load = 20.0A Volts/div = 50.0V

Horizontal Resolution = 2µs/div

Figure 6. Typical Waveforms seen at the Buck Stage Switching Node

SNVA074A–May 2004–Revised May 2013 AN-1299 LM5041 Evaluation Board

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