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Performance Characteristics

9.4 Transformer Waveforms

Figure 9, Figure 10, and Figure 11 show typical waveforms at the junction of Q1 MOSFET and the

transformer primary winding. Also shown are typical waveforms at the junction of the transformer

secondary and the output rectifier, D3. Figure 9 reflects an input voltage of 30VDC and a load of 4.5A.

Figure 10 reflects an input voltage of 50VDC with the same load. Figure 11 reflects an input voltage of

75VDC, also at full load.

Trace 1: Drain of Q1 at Vin = 30VDC; Volts/div = 50.0V

Trace 2: Anode of D3; Volts/div = 10.0V

Horizontal Resolution = 0.5µs/div

Figure 9. Typical Waveforms

Trace 1: Drain of Q1 at Vin = 50VDC; Volts/div = 50.0V

Trace 2: Anode of D3; Volts/div = 10.0V

Horizontal Resolution = 0.5µs/div

Figure 10. Typical Waveforms

Trace 1: Drain of Q1 at Vin = 75VDC; Volts/div = 50.0V

Trace 2: Anode of D3; Volts/div = 10.0V

Horizontal Resolution = 0.5µs/div

Figure 11. Typical Waveforms

SNVA082B–March 2004–Revised May 2013 AN-1314 LM5020 Evaluation Board

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