Datasheet

Performance Characteristics

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9 Performance Characteristics

9.1 Turn-on Waveforms

When applying power to the LM5041 evaluation board a certain sequence of events must occur. Soft-start

capacitor values and other components allow for a minimal output voltage for a short time until the

feedback loop can stabilize without overshoot. Figure 3 and Figure 4 show typical turn-on waveforms at no

load and at a load of 50A. Input voltage, output voltage and output current are shown.

9.2 Output Ripple Waveforms

Figure 5 shows output ripple for a load of 40A. The waveforms should be measured directly across the

output capacitors using a short tip-type ground lead on the scope probe. Bandwidth limiting may also

prove useful.

Trace 1: Input Voltage, no load Volts/div = 10.0V

Trace 2: Output Voltage, no load Volts/div = 1.0V

Trace 3: Output Current, no load Amps/div = 20.0A

Horizontal Resolution = 1µs/div

Figure 3. Typical Turn-on Waveform at No Load

Trace 1: Input Voltage, no loadVolts/div = 10.0V

Trace 2: Output Voltage, no load Volts/div = 1.0V

Trace 3: Output Current, no load Amps/div = 20.0A

Horizontal Resolution = 1µs/div

Figure 4. Typical Turn-on Waveform at a Load of 50A

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

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